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Autore: Grafiati
Pubblicato: 8 giugno 2024

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1

Hirakawa, Kazuhiko, Hiroshi Nakamura e Masaharu Aoki. "Crystal Growth of CuGaS2from Te, Te-Cu and Te-Cu-S Solutions". Japanese Journal of Applied Physics 24, Part 1, No. 3 (20 marzo 1985): 265–79. http://dx.doi.org/10.1143/jjap.24.265.

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2

Fenske, Dieter, e Jörg-Christian Steck. "Neue Cu-Te-Cluster". Angewandte Chemie 105, n. 2 (febbraio 1993): 254–57. http://dx.doi.org/10.1002/ange.19931050213.

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3

Fenske, Dieter, e Jörg-Christian Steck. "New CuTe Clusters". Angewandte Chemie International Edition in English 32, n. 2 (febbraio 1993): 238–42. http://dx.doi.org/10.1002/anie.199302381.

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4

Rátkai, L., A. P. Gonçalves, G. Delaizir, C. Godart, I. Kaban, B. Beuneu e P. Jóvári. "The Cu and Te coordination environments in Cu-doped Ge–Te glasses". Solid State Communications 151, n. 21 (novembre 2011): 1524–27. http://dx.doi.org/10.1016/j.ssc.2011.07.037.

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5

Zhao, Degang, Lin Wang, Di Wu e Lin Bo. "Thermoelectric Properties of Cu2SnSe3-Based Composites Containing Melt-Spun Cu–Te". Metals 9, n. 9 (3 settembre 2019): 971. http://dx.doi.org/10.3390/met9090971.

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Abstract (sommario):
In this study, the Cu–Te alloy ribbons containing nanocrystalline structures were prepared by melt spinning (MS), and were composed of Cu2−xTe, Cu2Te, Cu3−xTe, and CuTe phases. Crystal grains on both sides of the ribbons were uniformly distributed and the grain size of the contact surface was about 400 nm. The Cu–Te powder was incorporated into the Cu2SnSe3 powder by the ball milling process and the Cu–Te/Cu2SnSe3 thermoelectric composite was prepared by spark plasma sintering (SPS). With the amount of Cu–Te powder increasing, the carrier concentration of the Cu–Te/Cu2SnSe3 composite increased, while the carrier mobility and electrical conductivity initially increased and then decreased. Compared to the Seebeck coefficient of the Cu2SnSe3 matrix, the Seebeck coefficient of the Cu–Te/Cu2SnSe3 samples increased slightly. Moreover, the Cu–Te/Cu2SnSe3 composites had lower thermal conductivity and lattice thermal conductivity over the whole temperature range. The lattice thermal conductivity of the 0.8 vol.% Cu–Te/Cu2SnSe3 composite achieved the lowest value of 0.22 W/m·K, which was 78% lower than that of the Cu2SnSe3 matrix. The maximum figure of merit of the 0.8 vol.% Cu–Te/Cu2SnSe3 composite was 0.45 at 700 K.
6

Yu, Lei, Kun Luo, Shiyou Chen e Chun-Gang Duan. "Cu-deficiency induced structural transition of Cu2−xTe". CrystEngComm 17, n. 14 (2015): 2878–85. http://dx.doi.org/10.1039/c4ce02370f.

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Abstract (sommario):
All the reported structures of Cu2Te are found to be metastable with respect to the phase separation Cu2Te → Cu2−xTe + xCu, which causes a structural transition of Cu2−xTe from the monoclinic structure (stable when x = 0) to the trigonal structure (0.125 ≤ x ≤ 0.625). The experimental XRD peaks of Cu2−xTe samples should be attributed to the trigonal structure.
7

Gao, Jie, Xiaoyu Huang, Chong Qiao e Yu Jia. "The changeable coordination of structural and bonding characteristics in amorphous Cu2Te from ab initio molecular dynamics simulations". Journal of Applied Physics 132, n. 24 (28 dicembre 2022): 244302. http://dx.doi.org/10.1063/5.0128259.

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Crystalline Cu2Te has recently attracted a great deal of attention owing to its good performance in thermoelectric materials. Yet, knowledge of the amorphous phase is still insufficient, which may restrict its practical application. Here, we have studied the structural and bonding characteristics of amorphous Cu2Te by ab initio molecular dynamics simulations. We show that, compared with its crystal phase, the Cu atoms bond more Cu than Te atoms in amorphous Cu2Te and Te atoms predominantly bond with Cu atoms. In detail, the amorphous Cu2Te is made up of Cu–Te network structures and Cu–Cu high-coordinated configurations, presenting the hexagonal and icosahedral structures, respectively. This result is probably ascribed to both the stronger bonding ability of Cu–Cu bonds and the multivalence of Te atoms. Our findings enrich the knowledge of the local structure and the bonding nature of amorphous Cu2Te, which can guide the design of good performance Cu2Te based thermoelectric devices further.
8

Yang, Lei, Zhi-Gang Chen, Guang Han, Min Hong, Liqing Huang e Jin Zou. "Te-Doped Cu2Se nanoplates with a high average thermoelectric figure of merit". Journal of Materials Chemistry A 4, n. 23 (2016): 9213–19. http://dx.doi.org/10.1039/c6ta02998a.

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9

Liao, Chien-Neng, e Ching-Hua Lee. "Suppression of vigorous liquid Sn/Te reactions by Sn–Cu solder alloys". Journal of Materials Research 23, n. 12 (dicembre 2008): 3303–8. http://dx.doi.org/10.1557/jmr.2008.0409.

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Abstract (sommario):
Reactions of molten Sn–xCu (x = 0.05 to 1.0) alloys with Te substrate at 250 °C were investigated. A dosage of 0.1 wt% Cu in Sn is found to be effective in suppressing the vigorous Sn/Te reaction by forming a thin CuTe at the solder/Te interface. The CuTe morphology changes from irregular clusters into a layered structure with increasing Cu content in Sn. With the same reaction time, the CuTe thickness increases proportionally to the square root of Cu content in Sn–Cu alloys, suggesting a diffusion-controlled growth for CuTe.
10

Li, Min, Yong Luo, Gemei Cai, Xie Li, Xiaoyan Li, Zhongkang Han, Xinyi Lin, Debalaya Sarker e Jiaolin Cui. "Realizing high thermoelectric performance in Cu2Te alloyed Cu1.15In2.29Te4". Journal of Materials Chemistry A 7, n. 5 (2019): 2360–67. http://dx.doi.org/10.1039/c8ta10741f.

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Abstract (sommario):
Upon alloying with Cu2Te, the extra Te, which resides at the interstitial site of Cu1.15In2.29Te4 and creates resonant, impurity states and additional rattling modes, yields extensive lattice disorder, thus improving the thermoelectric performance significantly.
11

Kaur, Navjot, Atul Khanna e Alex C. Hannon. "Neutron diffraction investigation of copper tellurite glasses with high real-space resolution". Journal of Applied Crystallography 54, n. 6 (2 novembre 2021): 1647–55. http://dx.doi.org/10.1107/s1600576721009365.

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High real-space resolution neutron diffraction measurements up to 34 Å−1 were performed on a series of xCuO–(100 − x)TeO2 (x = 30, 40 and 50 mol%) glasses that were synthesized by the melt-quenching technique. The Fourier transformation of neutron diffraction structure factors was used to generate the pair distribution functions, with the first peak at 1.90 Å due to the overlapping Te–O and Cu–O atomic pairs. Reverse Monte Carlo (RMC) simulations were performed on the structure factors and the six partial atomic pair distributions of Cu–Cu, Cu–Te, Cu–O, Te–Te, Te–O and O–O were calculated. The Te–O and Cu–O distributions are very similar and asymmetrical, which revealed that there is a significant short-range disorder in the tellurite network due to the existence of a wide range of Te—O and Cu—O bond lengths. A high-Q (magnitude of momentum transfer function) neutron diffraction study revealed that the average Te–O coordination number decreases steadily from 3.45 to 3.18 with an increase in CuO concentration from 30 to 50 mol% in the glass network. Similar coordination number modifications were earlier found by the RMC analysis of neutron diffraction data sets of copper tellurite glasses that were performed up to lower Q maximum values of 9.5 Å−1. The comparison of high-Q and low-Q neutron diffraction studies reveals that RMC is a powerful and possibly the only technique that is available to elucidate the glass short-range and medium-range structural properties when diffraction data are available up to low Q values of, say, 9.5 Å−1, and when cation–oxygen bond lengths are strongly overlapping and cannot be resolved by Fourier transformation. In situ high-temperature (473 K) neutron diffraction studies of 50CuO–50TeO2 glass revealed that significant distortion of the tellurite network occurs with heating.
12

Louadi, Souad, Abeer Yassin, Hélène Bros e Robert Castanet. "Thermodynamic investigation of the AgTe and CuTe eutectic alloys". Journal of Alloys and Compounds 224, n. 2 (luglio 1995): 351–54. http://dx.doi.org/10.1016/0925-8388(95)01560-4.

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13

Song, Shaochang, Chun-Wan Timothy Lo, Masoud Aminzare, Yu-Chih Tseng, Suneesh Meledath Valiyaveettil e Yurij Mozharivskyj. "Enhancing the thermoelectric performance of Sn0.5Ge0.5Te via doping with Sb/Bi and alloying with Cu2Te: Optimization of transport properties and thermal conductivities". Dalton Transactions 49, n. 18 (2020): 6135–44. http://dx.doi.org/10.1039/d0dt00544d.

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Abstract (sommario):
SnTe-based thermoelectric materials are studied as potential substitutes for PbTe. Ge and Bi substitutions combined with the Cu2Te alloying can significantly improve thermoelectric properties of SnTe as shown for (Sn0.5Ge0.5)0.91Bi0.06Te(Cu2Te)0.05.
14

Baudry, Julia, Johannes F. Kopp, Heiner Boeing, Anna P. Kipp, Tanja Schwerdtle e Matthias B. Schulze. "Changes of trace element status during aging: results of the EPIC-Potsdam cohort study". European Journal of Nutrition 59, n. 7 (30 novembre 2019): 3045–58. http://dx.doi.org/10.1007/s00394-019-02143-w.

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Abstract Purpose We aimed to evaluate age-dependent changes of six trace elements (TE) [manganese (Mn), iron (Fe), zinc (Zn), copper (Cu), iodine (I), and selenium (Se)] over a 20-year period. Methods TE concentrations were determined using repeated serum samples taken at baseline and after 20 years of follow-up from 219 healthy participants of the EPIC-Potsdam study, using inductively coupled plasma tandem mass spectrometry. For each TE, absolute and relative differences were calculated between the two time points, as well as the proportion of individuals within normal reference ranges. Interdependence between age-related TE differences was investigated using principal component analysis (PCA). Relationships between selected factors (lifestyle, sociodemographic, anthropometric factors, and hypertension) and corresponding TE longitudinal variability were examined using multivariable linear regression models. Results Median age of our study sample was 58.32 years (4.42) at baseline and 40% were females. Median Mn, Zn, Se concentrations and Se to Cu ratio significantly decreased during aging while median Fe, Cu, I concentrations and Cu to Zn ratio significantly increased. A substantial percentage of the participants, at both time points, had Zn concentrations below the reference range. The first PCA-extracted factor reflected the correlated decline in both Mn and Zn over time while the second factor reflected the observed (on average) increase in both Cu and I over time. Overall, none of the investigated factors were strong determinants of TE longitudinal variability, except possibly dietary supplement use, and alcohol use for Fe. Conclusions In conclusion, in this population-based study of healthy elderly, decrease in Mn, Zn, and Se concentrations and increase in Fe, Cu, and I concentrations were observed over 20 years of follow-up. Further research is required to investigate dietary determinants and markers of TE status as well as the relationships between TE profiles and the risk of age-related diseases.
15

Zeng, Tao, Lin Jiao, Da Chuan Zhu e Chen Yang. "The Friction and Wear Properties of Cu-Te-Li Alloys with High-Strength and High-Conductivity". Applied Mechanics and Materials 599-601 (agosto 2014): 153–59. http://dx.doi.org/10.4028/www.scientific.net/amm.599-601.153.

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The friction and wear properties of Cu-Te-Li alloys under dry sliding condition were studied by M-200 wear testing machine. The morphology and chemical composition of worn surfaces were analyzed by SEM and EDS, thus the effect of aging treatment on friction coefficient, wear rate and wear mechanism was discussed. The results showed that Te element could improve the wear resistance of copper alloys. With Te content increasing, the friction coefficient of Cu-Te-Li alloys declined slightly and tended to be stable as a whole, while the wear rate decreased obviously. During the process of dry sliding friction, adhesive wear was the dominant mechanism, with oxidative wear coexisting. But for the Cu-Te-Li alloys after aging treatment, abrasive wear appeared and adhesive wear was intensified, especially at higher friction velocity.
16

Cheng, Lijuan, Miao Wang, Cuijin Pei, Bin Liu, Hua Zhao, Hui Zhao, Congjie Zhang, Heqing Yang e Shengzhong (Frank) Liu. "Flowerlike Cu2Te architectures constructed from ultrathin nanoflakes as superior dye adsorbents for wastewater treatment". RSC Advances 6, n. 83 (2016): 79612–19. http://dx.doi.org/10.1039/c6ra10174g.

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Abstract (sommario):
Flowerlike architectures assembled from Cu2Te nanoflakes have been synthesized using a hydrothermal reaction of Te, Cu foils, and KBH4with H2O in the presence of ethanol amine (EA) at 200 °C for 12 h.
17

Saleh, N. S., I. J. Jabr e K. A. Al-Saleh. "Ion beam induced atomic mixing kinetics of Te/Cu and Te/Ag". Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 71, n. 3 (settembre 1992): 264–70. http://dx.doi.org/10.1016/0168-583x(92)95398-b.

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18

Yang, Hailong, Pascal Boulet e Marie-Christine Record. "Cu-Sb-Te Ternary Phase Diagram Evaluation". MSI Eureka 80 (18 settembre 2019): 10.19259.1.8. http://dx.doi.org/10.7121/msi-eureka-10.19259.1.8.

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19

Goux, L., K. Opsomer, R. Degraeve, R. Müller, C. Detavernier, D. J. Wouters, M. Jurczak, L. Altimime e J. A. Kittl. "Influence of the Cu-Te composition and microstructure on the resistive switching of Cu-Te/Al2O3/Si cells". Applied Physics Letters 99, n. 5 (agosto 2011): 053502. http://dx.doi.org/10.1063/1.3621835.

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20

Michaud, Aurélia Marcelline, Philippe Cambier, Valérie Sappin-Didier, Valentin Deltreil, Vincent Mercier, Jean-Noël Rampon e Sabine Houot. "Mass balance and long-term soil accumulation of trace elements in arable crop systems amended with urban composts or cattle manure during 17 years". Environmental Science and Pollution Research 27, n. 5 (17 dicembre 2019): 5367–86. http://dx.doi.org/10.1007/s11356-019-07166-8.

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AbstractOrganic waste products (OWP) application to crop lands makes possible nutrients recycling. However, it can result in long-term accumulation of trace elements (TE) in soils. The present study aimed at (i) assessing the impact of regular applications of urban composts and manure on the TE contents of topsoils and crops in a long-term field experiment, (ii) comparing the TE mass balances with the stock variations of TE in soils, and (iii) proposing a prospective evaluation of this practice, based on estimated soil safe threshold values and simulations of soil TE accumulation for 100 years. In the long-term field experiment, physico-chemical properties and TE contents (Cd, Cr, Cu, Hg, Ni, Pb and Zn) have been measured in OWP, soils, plants and leaching waters for the period 1998–2015, and used for mass balance calculations and long-term simulations of TE accumulations. The composts of green wastes and sludge (GWS) and of municipal solid waste (MSW) were the OWP with the largest TE contents, while the farmyard manure tended to have the lowest. Repeated application of OWP led to significant accumulation of Zn and Cu in the topsoil layer (not for Cr, Cd, Hg, Ni, Pb), especially with GWS, without overpassing calculated protective threshold values. No effect of repeated application of OWP has been observed on TE contents in grains (wheat, maize, barley). The positive mass balance has been dominated by the input flux of TE through OWP and resulted in the observed increases of soil stocks for Cu and Zn. Prospective simulation of soil content evolution until 2100 showed that soil content reached 0.4 mg Cd kg−1 soil (GWS, MSW), 38 mg Cu kg−1 soil (GWS) and 109 mg Zn kg−1 soil (GWS), which remained lower than protective threshold values.
21

Aliyev, Y. I., Y. G. Asadov, L. B. Rustamova, A. O. Dashdemirov, N. A. Ismayilova, A. A. Ayubov e S. H. Jabarov. "Structural and thermal properties of Cu1.75−xMxTe crystals". International Journal of Modern Physics B 34, n. 19 (27 luglio 2020): 2050180. http://dx.doi.org/10.1142/s0217979220501805.

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Abstract (sommario):
Single crystals of Cu[Formula: see text]Te, Cu[Formula: see text]Zn[Formula: see text]Te and Cu[Formula: see text]Cd[Formula: see text]Te compounds were synthesized by Brijmen method and their crystal structure was studied by X-ray diffraction. The hexagonal, orthorhombic aand cubic structure phases of these compounds have been determined at room-temperature. Phase transitions at high-temperatures were observed. Lattice parameters for hexagonal, orthorhombic and cubic phases have been determined in the temperature range of [Formula: see text]–1073 K. From the temperature dependences of the lattice parameters, the coefficients of thermal expansion of the existing modifications in the main crystallographic directions were calculated.
22

Park, Dabin, Hyun Ju, Taeseob Oh e Jooheon Kim. "Fabrication of one-dimensional Cu2Te/Te nanorod composites and their enhanced thermoelectric properties". CrystEngComm 21, n. 10 (2019): 1555–63. http://dx.doi.org/10.1039/c8ce01790e.

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23

Yamashita, Osamu, e Hirotaka Odahara. "Effect of the thickness of Bi–Te compound and Cu electrode on the resultant Seebeck coefficient in touching Cu/Bi–Te/Cu composites". Journal of Materials Science 42, n. 13 (22 febbraio 2007): 5057–67. http://dx.doi.org/10.1007/s10853-006-0600-z.

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24

Park, Okmin, TaeWan Kim, Minsu Heo, Sang Jeong Park, Se Woong Lee, Hyun Kyu Cho e Sang-il Kim. "Electrical, Thermal, and Thermoelectric Transport Properties of Co-Doped <i>n</i>-type Cu<sub>0.008</sub>Bi<sub>2</sub>Te<sub>2.6</sub>Se<sub>0.4</sub> Polycrystalline Alloys". Korean Journal of Metals and Materials 61, n. 3 (5 marzo 2023): 206–12. http://dx.doi.org/10.3365/kjmm.2023.61.3.206.

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Abstract (sommario):
Bi<sub>2</sub>Te<sub>3</sub>-based alloys have been extensively studied as thermoelectric materials near room temperature. In this study, the electrical, thermal, and thermoelectric transport properties of a series of Co-doped <i>n</i>-type Cu<sub>0.008</sub>Bi<sub>2</sub>Te<sub>2.6</sub>Se<sub>0.4</sub> polycrystalline alloys (Cu<sub>0.008</sub>Bi<sub>2−x</sub>Co<sub>x</sub>Te<sub>2.6</sub>Se<sub>0.4</sub>, <i>x</i> = 0, 0.03, 0.06, 0.09 and 0.12) are investigated. The electrical conductivity of the Cu<sub>0.008</sub>Bi<sub>1.97</sub>Co<sub>0.03</sub>Te<sub>2.6</sub>Se<sub>0.4</sub> (<i>x</i> = 0.03) sample was significantly enhanced, by 34%, to 1199 S/cm compared to 793 S/cm of the pristine Cu<sub>0.008</sub>Bi<sub>2</sub>Te<sub>2.6</sub>Se<sub>0.4</sub> (<i>x</i> = 0) sample at 300 K, and gradually decreased to 906 S/cm for <i>x</i> = 0.12 upon further doping. Power factors of the Co-doped samples decreased compared to the 3.26 mW/mK<sup>2</sup> of the pristine Cu<sub>0.008</sub>Bi<sub>2</sub>Te<sub>2.6</sub>Se<sub>0.4</sub> sample at 300 K. Meanwhile, the power factor of the Cu<sub>0.008</sub>Bi<sub>1.97</sub>Co<sub>0.03</sub>Te<sub>2.6</sub>Se<sub>0.4</sub> (<i>x</i> = 0.03) sample became higher at 520 K. The lattice thermal conductivities of the Co-doped samples decreased due to additional point defect phonon scattering by the Co dopant. Consequently, the <i>zT</i> for the Cu<sub>0.008</sub>Bi<sub>1.97</sub>Co<sub>0.03</sub>Te<sub>2.6</sub>Se<sub>0.4</sub> alloy at 520 K was 0.83, which is approximately 15% larger than that of pristine Cu<sub>0.008</sub>Bi<sub>2</sub>Te<sub>2.6</sub>Se<sub>0.4</sub>, while the <i>zT</i> of the Cu doped samples at 300 K was smaller than that of the pristine Cu<sub>0.008</sub>Bi<sub>2</sub>Te<sub>2.6</sub>Se<sub>0.4</sub> sample. Electrical transport properties of the Co-doped Cu<sub>0.008</sub>Bi<sub>2−x</sub>Co<sub>x</sub>Te<sub>2.6</sub>Se<sub>0.4</sub> samples were analyzed by experimental phenomenological parameters, including the density-of-state, effective mass, weighted mobility, and quality factor.
25

Zhang, Yu, Yu Liu, Mariano Calcabrini, Congcong Xing, Xu Han, Jordi Arbiol, Doris Cadavid, Maria Ibáñez e Andreu Cabot. "Bismuth telluride–copper telluride nanocomposites from heterostructured building blocks". Journal of Materials Chemistry C 8, n. 40 (2020): 14092–99. http://dx.doi.org/10.1039/d0tc02182b.

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26

Nilges, Tom. "The Solid SolutionsM19Q6X7withM= Ag, Cu;Q= S, Se, Te andX= S, Se, Te". Zeitschrift für anorganische und allgemeine Chemie 634, n. 12-13 (ottobre 2008): 2185–90. http://dx.doi.org/10.1002/zaac.200800128.

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27

Beygelzimer, Yan, Dmitry Orlov, Alexander Korshunov, Sergey Synkov, Viktor Varyukhin, Irina Vedernikova, Alexey Reshetov, Alexandr Synkov, Lev Polyakov e Irina Korotchenkova. "Features of Twist Extrusion: Method, Structures & Material Properties". Solid State Phenomena 114 (luglio 2006): 69–78. http://dx.doi.org/10.4028/www.scientific.net/ssp.114.69.

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During the last decade it has been shown that severe plastic deformation (SPD) is a very effective for obtaining ultra-fine grained (UFG) and nanostructured materials. The basic SPD methods are High Pressure Torsion (HPT) and Equal Channel Angular Extrusion (ECAE). Recently several new methods have been developed: 3D deformation, Accumulative Roll Bonding, Constrained Groove Pressing, Repetitive Corrugation and Straightening, Twist Extrusion (TE), etc. In this paper the twist extrusion method is analyzed in terms of SPD processing and the essential features from the “scientific” and “technological” viewpoint are compared with other SPD techniques. Results for commercial, 99.9 wt.% purity, copper processed by TE are reported to show the effectiveness of the method. UFG structure with an average grain size of ~0.3 μm was produced in Cu billets by TE processing. The mechanical properties in copper billets are near their saturation after two TE passes through a 60º die. Subsequent processing improves homogeneity and eliminates anisotropy. The homogeneity of strength for Cu after TE is lower than after ECAE by route BC, but higher than after ECAE by route C. The homogeneity in ductility characteristics was of almost of inverse character. The comparison of mechanical properties inhomogeneity in Cu after TE and ECAE suggests that alternate processing by ECAE and TE should give the most uniform properties.
28

Grosbois, Cécile, Marc Desmet, Mengxue Zhang, Nathalie Gassama, Qinghui Peng, Jiachao Zhang, Lin Luo, Fengfeng Zhang e Fabienne Battaglia. "Trace Element Contamination in One of the Yangtze Tributaries (Hunan, China)—Source Review and Potential Release from Sediments". Water 13, n. 3 (22 gennaio 2021): 271. http://dx.doi.org/10.3390/w13030271.

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Spatio-temporal distribution and leachability of some trace elements (TE) were investigated in sediments of the Xiangjiang River, tributary of the Yangtze River. Based on data collected during 2015–2017, a literature review and geoaccumulation indexes, the pollution level was the highest for Cd, Sb and Hg (Igeo > 3). Over the period reviewed, the TE contamination level displayed almost no temporal variation but an obvious spatial distribution. The most upstream contamination hotspot (Cd > Cr > As, Cu, Pb, Zn > Hg, Sb) was the Songbai section. This hotspot did not spread further downstream. The second hotspot identified was the Zhuzhou–Xiangtan section, impacted by Cd > Hg, Pb, Zn > Cu, with the Zhuzhou area being particularly highly impacted by Pb and Zn. A 30-day leaching experimental protocol under aerobic and anaerobic conditions was carried out to access TE mobility. Low percentages of TE released were calculated, showing that the TE fate mostly depends on the stability of bearing phases under specific physicochemical and microbial conditions. In this case, the studied sediments can be an important sink for these TE. However, some environmental issues have to be considered as some leachate concentrations of contaminants (As, Cr, Cu and U) released into water exceed freshwater aquatic life criteria.
29

Qi, Xia, Yi Huang, Di Wu, Binbin Jiang, Bin Zhu, Xiao Xu, Jianghe Feng, Baohai Jia, Zhong Shu e Jiaqing He. "Eutectoid nano-precipitates inducing remarkably enhanced thermoelectric performance in (Sn1−xCdxTe)1−y(Cu2Te)y". Journal of Materials Chemistry A 8, n. 5 (2020): 2798–808. http://dx.doi.org/10.1039/c9ta11180h.

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Zeng, Hong, Fupeng Liu, Songlin Zhou, Chunfa Liao, Feixiong Chen e Yanliang Zeng. "Leaching Behavior of the Main Metals from Copper Anode Slime during the Pretreatment Stage of the Kaldor Furnace Smelting Process". Processes 10, n. 12 (25 novembre 2022): 2510. http://dx.doi.org/10.3390/pr10122510.

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The Kaldor furnace smelting process is currently the mainstream process for treating copper anode slime, but the existence of copper, tellurium and other impurities has adverse effects on the recovery of gold and silver during the Kaldor furnace smelting stage. Therefore, it is necessary to pretreat the copper anode slime to remove these impurities before Kaldor furnace reduction smelting. However, the current pretreatment process of copper anode slime generally has the problem of low removal efficiency of copper and tellurium, and little research on the occurrence state of main metals in copper anode slime. Therefore, this study quantitatively determined the phase composition of Cu, Te, Pb, Bi, As, Sb, Se, Ag and Au, and hydrogen peroxide was introduced to enhance the leaching of impurities. The leaching behavior of each metal in copper anode slime was investigated in detail. The results demonstrate that Cu and Te in the copper anode slime mainly exist in the form of CuO and CuSO4 and Te and AuTe2, respectively. More than 99% of the Cu and 97% of the Te were leached out using 250 g/L H2SO4 and 28.8 g/L H2O2 with a leaching pressure of 0.8 MPa at 150 °C for 2 h, while the leaching of Au and Ag was both < 0.03%. The removal of Cu and Te and the enrichment of precious metals were achieved. This study provides a rich theoretical reference for the optimization of the Kaldor furnace process.
31

Kikuchi, Shigeru, Kiyomi Nakamura e Noboru Baba. "Mechanical Properties of Cr-Cu-Te Ternary Compound". Journal of the Japan Society of Powder and Powder Metallurgy 57, n. 6 (2010): 383–86. http://dx.doi.org/10.2497/jjspm.57.383.

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32

Yuan, Huanmei, Tianqing Wan e Hao Bai. "Resistive Switching Characteristic of Cu Electrode-Based RRAM Device". Electronics 12, n. 6 (20 marzo 2023): 1471. http://dx.doi.org/10.3390/electronics12061471.

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The conductive bridge random access memory (CBRAM) device has been widely studied as a promising candidate for next-generation nonvolatile memory applications, where Cu as an electrode plays an important role in the resistive switching (RS) process. However, most studies only use Cu as one electrode, either the top electrode (TE) or the bottom electrode (BE); it is rarely reported that Cu is used as both TE and BE at the same time. In this study, we fabricated CBRAM devices by using Cu as both the TE and BE, and studied the RS characteristic of these devices. With Al2O3 as the switching layer (5~15 nm), the devices showed good bipolar RS characteristics. The endurance of the device could be as high as 106 cycles and the retention time could be as long as 104 s. The Al2O3 thickness influences the bipolar RS characteristic of the devices including the initial resistance, the forming process, endurance, and retention performance. The Cu electrode-based RRAM devices also present negative bias-suppressed complementary resistive switching (CRS) characteristics, which makes it effective to prevent the sneak path current or crosstalk problem in high-density memory array circuits.
33

Bayata, Fatma. "Enhancement of high temperature thermoelectric performance of cobaltite based materials for automotive exhaust thermoelectric generators". Smart Materials and Structures 31, n. 2 (27 dicembre 2021): 025017. http://dx.doi.org/10.1088/1361-665x/ac4120.

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Abstract Thermoelectric (TE) generators can directly convert exhaust waste heat into electricity in vehicles. However, the low conversion efficiency of TE generators is the main obstacle to their commercialization in automotive. Their efficiency mainly depends on the performance of the used materials which is quantified by the figure of merit (ZT value). In the present study, single- and co-doped calcium cobaltites (CCO) with rare-earth (Tb) and transition metals (Cu, Fe, Ni, Mn, Cr) were produced using sol–gel technique in order to improve their high temperature TE properties for heat recovery in exhaust manifold applications. By the combined effect of doping approach and the production technique used in this study, a remarkable decrease in the grain size of CCO was obtained, and thus its thermal conductivity dramatically decreased. Besides, thermopower values were improved significantly. The reduction in thermal conductivity and the increase in thermopower led to an enhancement in ZT value of CCO ceramics. Among all the co-doped samples, Tb–Cu co-doped CCO displayed the maximum ZT value of 0.116 at 873 K which is 2.5 times larger than that of pure CCO. The high thermal stability and the enhanced TE performance make Tb–Cu co-doped CCO material a potential candidate for heat recovery in automotive exhaust TE generators.
34

Dong, Yongkwan, Brian Eckert, Hsin Wang, Xiaoyu Zeng, Terry M. Tritt e George S. Nolas. "Synthesis, crystal structure, and transport properties of Cu2.2Zn0.8SnSe4−xTex (0.1 ≤ x ≤ 0.4)". Dalton Transactions 44, n. 19 (2015): 9014–19. http://dx.doi.org/10.1039/c5dt00910c.

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The synthesis, crystal structure and transport properties of Cu2.xZn0.8SnSe4−xTex (x = 0.1–0.4) series were investigated. Cu2.2Zn0.8SnSe3.7Te0.3 has a ZT value of 0.56 at 700 K, the highest ZT value thus far reported for solid-solution compositions in this material system.
35

Jafarzadeh, Parisa, Maegan R. Rodrigues, Yixuan Shi, Abdeljalil Assoud, Tianze Zou, Jan B. Kycia e Holger Kleinke. "Effect of mixed occupancies on the thermoelectric properties of BaCu6−xSe1−yTe6+y polychalcogenides". Dalton Transactions 48, n. 25 (2019): 9357–64. http://dx.doi.org/10.1039/c9dt01616c.

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36

Mukherjee, Indrani, e Ross R. Large. "Co-evolution of trace elements and life in Precambrian oceans: The pyrite edition". Geology 48, n. 10 (19 giugno 2020): 1018–22. http://dx.doi.org/10.1130/g47890.1.

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Abstract The significance of trace elements in initiating origins and driving evolution of life on Earth is indisputable. Trace element (TE) trends in the oceans through time broadly reflect their availability and allow speculation on all possible influences on early life. A comprehensive sedimentary pyrite–TE database, covering 3000 m.y. of the Precambrian, has improved our understanding of the sequence of bio-essential TE availability in the ocean. This study probed how changing availability (and scarcity) of critical TEs in the marine environment influenced early life. The pyrite-shale matrix TE sequence shows relatively elevated concentrations of Ni, Co, Cu, and Fe, Cr, respectively, in the Archean and Paleoproterozoic. Abundances of these elements in the Archean potentially facilitated their widespread utilization by prokaryotes. The Paleoproterozoic–Mesoproterozoic saw increases in Zn and Mo but a marked decline in Ni, Co, Cu, Se, and Fe. Our data suggest the evolution of the first complex cell in the Paleoproterozoic was probably triggered by this major change in TE composition of the oceans. A decline of elements prompted alternative utilization strategies by organisms as a response to TE deficits in the middle Proterozoic. An overall increase in a multitude of elements (Ni, Co, Cu, Cr, Se, V, Mo, and P) in the Neoproterozoic and Cambrian was highly advantageous to the various micro– and macro–life forms. Without questioning the importance of macronutrients and atmosphere-ocean redox state, multi-TE availability would have induced substantial heterogenous biological responses, owing to the effects of optimal, deficient, toxic, lethal, and survival levels of TEs on life.
37

Bindi, L., P. Voudouris e P. G. Spry. "Structural role of tellurium in the minerals of the pearceite-polybasite group". Mineralogical Magazine 77, n. 4 (giugno 2013): 419–28. http://dx.doi.org/10.1180/minmag.2013.077.4.02.

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AbstractThe crystal structure of a Te-rich polybasite has been refined by means of X-ray diffraction data collected at room temperature (space group Pm1; R = 0.0505 for 964 observed reflections and 94 parameters; refined formula Ag14.46Cu1.54Sb1.58As0.42S9.67Te1.33). The structure comprises stacking of [(Ag, Cu)6(Sb, As)2(S, Te)7]2–A and [Ag9Cu(S, Te)2(S, Te)2]2+B layer modules in which Sb forms isolated SbS3 pyramids, as occurs typically in sulfosalts, Cu links two S atoms in a linear coordination and Ag occupies sites with coordination ranging from quasi linear to almost tetrahedral. The silver d10 ions are found in the B layer module along two-dimensional diffusion paths and their electron densities evidenced by means of a combination of a Gram-Charlier development of the atomic displacement factors and a split model. The Te-for-S substitution occurs at the same structural sites that Se substitutes for S in selenopolybasite and the Te occupancy at one of these sites is 0.49, thus suggesting the possibility that 'telluropolybasite' could be found in nature.
38

Yarema, Olesya, Maksym Yarema, Weyde M. M. Lin e Vanessa Wood. "Cu–In–Te and Ag–In–Te colloidal nanocrystals with tunable composition and size". Chemical Communications 52, n. 72 (2016): 10878–81. http://dx.doi.org/10.1039/c6cc05571k.

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39

Inna Hamida Zusfindhana. "Peningkatan Kemampuan Perkalian 10-20 melalui Metode Jarimatika Pada Siswa Tunarungu di SLB-B dan Autis TPA Jember". SPECIAL : Special and Inclusive Education Journal 1, n. 1 (14 maggio 2020): 37–43. http://dx.doi.org/10.36456/special.vol1.no1.a2282.

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Tujuan dari penelitian ini untuk meningkatkan kemampuan perkalian 10-20 siswa tunarunggu kelas IV. Metode yang digunakan yaitu Penelitian Tindakan Kelas (PTK) dengan tahapan para siklus, siklus 1 dan siklus 2. Subjek penelitian merupakan siswa tunarungu kelas IV yang berjumlah 5 orang. Hasil penelitian menunjukkan pada tahap pra siklus nilai yang dicapai siswa tunarungu masih belum mencapai KKM yaitu nilai 70. NA, CU mendapat nilai 40, sedangkan DN mendapat nilai 35, TA dan TE mendapat nilai 30. Pada siklus 1 nilai yang didapat oleh NA 55, CU 50, DN 60, TA 50, dan TE 55. Pada siklus II nilai yang diperoleh NA 80, CU 80, DN 85, TA 85 dan TE 80. Berdasarkan hasil nilai tes yang diperoleh dari siklus I sampai siklus II diketahui bahwa kemampuan mengenal perkalian 10-20 pada siswa tunarungu kelas IV di SLB-B dan Autis TPA Jember mengalami peningkatan
40

Qiu, Yuchong, Ying Liu, Jinwen Ye, Jun Li e Lixian Lian. "Synergistic optimization of carrier transport and thermal conductivity in Sn-doped Cu2Te". Journal of Materials Chemistry A 6, n. 39 (2018): 18928–37. http://dx.doi.org/10.1039/c8ta04993a.

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Abstract (sommario):
Doping Sn into the Cu2Te lattice can synergistically enhance the power factor and decrease thermal conductivity, leading to remarkably optimized zTs. The lone pair electrons from the 5s orbital of Sn can increase the DOS near the Fermi level of Cu2Te to promote PF and reduce κe by decreasing the carrier concentration. This study explores a scalable strategy to optimize the thermoelectric performance for intrinsically highly degenerate semiconductors.
41

Hasan, Md Kamrul, Mehmet Ali Üstüner, Hayati Mamur e Mohammad Ruhul Amin Bhuiyan. "Enhancing Bi2Te2.70Se0.30 Thermoelectric Module Performance through COMSOL Simulations". Thermo 4, n. 2 (6 maggio 2024): 185–201. http://dx.doi.org/10.3390/thermo4020011.

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This research employs the COMSOL Multiphysics software (COMSOL 6.2) to conduct rigorous simulations and assess the performance of a thermoelectric module (TEM) meticulously crafted with alumina (Al2O3), copper (Cu), and Bi2Te2.70Se0.30 thermoelectric (TE) materials. The specific focus is on evaluating diverse aspects of the Bi2Te2.70Se0.30 thermoelectric generator (TEG). The TEM design incorporates Bi2Te2.70Se0.30 for TE legs of the p- and n-type positioned among the Cu layers, Cu as the electrical conductor, and Al2O3 serving as an electrical insulator between the top and bottom layers. A thorough investigation is conducted into critical parameters within the TEM, which include arc length, electric potential, normalized current density, temperature gradient, total heat source, and total net energy rate. The geometric configuration of the square-shaped Bi2Te2.70Se0.30 TEM, measuring 1 mm × 1 mm × 2.5 mm with a 0.25 mm Al2O3 thickness and a 0.125 mm Cu thickness, is scrutinized. This study delves into the transport phenomena of TE devices, exploring the impacts of the Seebeck coefficient (S), thermal conductivity (k), and electrical conductivity (σ) on the temperature differential across the leg geometry. Modeling studies underscore the substantial influence of S = ±2.41 × 10−3 V/K, revealing improved thermal conductivity and decreased electrical conductivity at lower temperatures. The findings highlight the Bi2Te2.70Se0.30 TEM’s high potential for TEG applications, offering valuable insights into design and performance considerations crucial for advancing TE technology.
42

Thompson-Morrison, Hadee, Sally Gaw e Brett Robinson. "An Assessment of Trace Element Accumulation in Palm Oil Production". Sustainability 14, n. 8 (11 aprile 2022): 4553. http://dx.doi.org/10.3390/su14084553.

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African oil palm (Elaeis guineensis) is grown on 17,000,000 hectares in Southeast Asia, producing oil and the by-product, palm kernel expeller (PKE), for export. Elaeis guineensis is typically produced on weathered acidic soils, with fertilisers and fungicides used to increase production. These amendments can contain elevated concentrations of trace elements (TEs), either as the active ingredient (e.g., Cu-based fungicides) or as contaminants, including F, Zn, As, Cd, Pb and U. TEs may accumulate in soil over time, and be taken up by plants, posing a food-chain transfer risk if allowed to exceed soil guideline values. We reviewed available literature on trace elements in soil, plant material, oil and PKE to evaluate the risk of TE accumulation due to phosphate fertiliser and Cu-fungicide use. TE concentrations of Cu, Zn, and Cd were reported to be up to 69, 107 and 5.2 mg kg−1, respectively, in E. guineensis plantation soils, while Cu and As were reported to be up to 28.9 and 3.05 mg kg−1, respectively, in PKE (>50% their permissible limits). Iron, a TE, has also been reported in PKE up to 6130 mg kg−1 (>10-fold the permissible limit). TE accumulation is an emerging issue for the palm oil industry, which, if unaddressed, will negatively affect the industry’s economic and environmental sustainability. There are critical knowledge gaps concerning TEs in palm oil systems, including a general lack of research from Southeast Asian environments and information concerning key contaminants (Fe, Cu, As and Cd) in soils, plants and PKE.
43

Yun, Seong Min, Injoon Son e Sung Hwa Bae. "Effect of Plating Layers on the Bonding Strength of p-Type Bi–Te Thermoelectric Elements". Journal of Nanoscience and Nanotechnology 21, n. 8 (1 agosto 2021): 4503–7. http://dx.doi.org/10.1166/jnn.2021.19433.

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In thermoelectric modules, multiple n-type and p-type thermoelectric elements are electrically connected in series on a Cu electrode that is bonded to a ceramic substrate. Defects in the bond between the thermoelectric elements and the Cu electrode could impact the performance of the entire thermoelectric module. This study investigated the effect of plating layers on the bonding strength of p-type Bi–Te thermoelectric elements. Ni and Pd electroplating was applied to Bi–Te thermoelectric elements; further, electroless Ni–P immersion gold (ENIG) plating was applied to Cu electrodes bonded to ceramic substrates. Forming a Pd/Ni electroplating layer on the surface of thermoelectric elements and an ENIG plating layer on the surface of the Cu electrode improved the bonding strength by approximately 3.5 times. When the Pd/Ni and ENIG plating layers were formed on Bi–Te elements and Cu substrates, respectively, the solderability greatly increased; as the solderability increased, the thickness of the diffusion layer formed with the solder layer increased. The improved bonding strength of the Pd/Ni plated thermoelectric element bonded on the ENIG plated substrate is attributed to the enhanced solderability due to the rapid inter-diffusion of Pd and Au into the solder layer and the formation of a stable and non-defected solder reaction interface layer.
44

Yang, Jiangfeng, Shaoping Chen, Zhengliang Du, Xianglian Liu e Jiaolin Cui. "Lattice defects and thermoelectric properties: the case of p-type CuInTe2 chalcopyrite on introduction of zinc". Dalton Trans. 43, n. 40 (2014): 15228–36. http://dx.doi.org/10.1039/c4dt01909a.

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Multiple defects identified in Zn-substituted CuInTe2 are responsible for a reduced difference between d(In–Te)4b and d(Cu–Te)4a and an improvement in the thermoelectric performance.
45

Shimizu, Masaaki, e Chris J. Stanley. "Coupled substitutions in goldfieldite–tetrahedrite minerals from the Iriki mine, Japan". Mineralogical Magazine 55, n. 381 (dicembre 1991): 515–19. http://dx.doi.org/10.1180/minmag.1991.055.381.03.

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AbstractChemical compositions of goldfieldite-tetrahedrite series minerals from the Iriki mine in Japan are reported for the frst time. The compositional variations of coexisting goldfieldite [atomic proportion Te > (Sb + As + Bi)], tellurian tetrahedrite [Sb > (Te + As + Bi)], and Te-free tetrahedrite from this locality are considered alongside data from the literature. These show that the substitution of (Sb, As)3+ for Te4+ in natural goldfieldite-tetrahedrite series minerals occurs by the following two mechanisms: (i) tetrahedrite, and goldfieldite, form a continuous solid-solution according to the coupled substitution of Cu+Te4+ for (Cu,Fe,Zn)2+(Sb,As)3+, and (ii) goldfieldite, and the ideal end-member, might also form a continuous solid-solution by the coupled substitution of ☐(vacancy)Te4+ for Cu+(Sb,As)3+. According to this work, the general formulae of tellurian tetrahedrite and goldfieldite are, therefore, respectively, , with x = 0 to 2 and , with y = 0 to 2.
46

Cui, Jiaolin, Gemei Cai e Wei Ren. "Increased effective mass and carrier concentration responsible for the improved thermoelectric performance of the nominal compound Cu2Ga4Te7 with Sb substitution for Cu". RSC Advances 8, n. 38 (2018): 21637–43. http://dx.doi.org/10.1039/c8ra03704c.

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47

Yamashita, O., e H. Odahara. "Local Seebeck coefficient near the boundary in touching Cu/Bi-Te/Cu composites". Applied Physics A 87, n. 4 (20 febbraio 2007): 661–66. http://dx.doi.org/10.1007/s00339-007-3888-x.

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48

Yamashita, Osamu, e Hirotaka Odahara. "Enhancement of the generating power in Cu/Bi–Te/Cu composite thermoelectric devices". Journal of Materials Science 42, n. 10 (20 gennaio 2007): 3520–28. http://dx.doi.org/10.1007/s10853-006-1410-z.

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49

Yu, Hyeon Jin, Mahn Jeong, Young Soo Lim, Won-Seon Seo, O.-Jong Kwon, Cheol-Hee Park e Hae-Jin Hwang. "Effects of Cu addition on band gap energy, density of state effective mass and charge transport properties in Bi2Te3 composites". RSC Adv. 4, n. 82 (2014): 43811–14. http://dx.doi.org/10.1039/c4ra07134d.

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50

Klepp, Kurt O. "Darstellung und Kristallstruktur von NaCu3Te2/ Preparation and Crystal Structure of NaCu3Te2". Zeitschrift für Naturforschung B 42, n. 2 (1 febbraio 1987): 130–34. http://dx.doi.org/10.1515/znb-1987-0202.

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Abstract (sommario):
Abstract The title compound was prepared by reacting a corresponding mixture of Na2Te2 , copper and tellurium at 700 °C. NaCu3Te2 forms crystals of metallic lustre which are rapidly decomposed in humid atmosphere. It crystallizes with a rhombohedral structure, space group R3m, with a = 4.276(3) Å, c = 23.78(1) Å, Z = 3. The crystal structure was determined from diffractometer data and refined to a conventional R of 0.050 for 135 independent reflections.The atomic arrangement of NaCu3Te2 is based on a c.c.p. array of tellurium atoms with stacking sequence c6 . Na and Cu occupy alternatingly the interstitial layers. Na is in an octahedral coordination (d̄Na-Te : 3.22 Å), the Cu atoms occupy the tetrahedral and the octahedral voids. They are, however, shifted from the centers of these sites, resulting in an 1 + 3 coordination (d̄Cu-Te : 2.70 Å) for Cu on the tetrahedral. and an essentially trigonal coordination (dCu-Te : 2.575 Å) for Cu on the octahedral sites.NaCu3Te2 shows no closer structural relationships to the other alkali-copper-chalcogenides known so far. However, its crystal structure may be interpreted as an ordered defect derivative structure of the CaCu4P2 -type [1].
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