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Artykuły w czasopismach na temat „Double Perovskite Ceramic”

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Data publikacji: 6 września 2023

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1

Albutt, Naphat, Suejit Pechprasarn, Sangwoei Sawekwiharee, Anchana Kuttiyawong, Panakamon Thonglor i Thanapong Sareein. "Complete Phase Change of Y2NiMnO6 Ceramics Doped with TiO2 at High Temperature". Applied Mechanics and Materials 879 (marzec 2018): 47–50. http://dx.doi.org/10.4028/www.scientific.net/amm.879.47.

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Determining the structure of ceramic materials is essential in order to fully characterize the electrical properties and improve existing materials. YMNO ceramics (Y2NiMnO6) prepared by compression and sintering were doped with TiO2 and analyzed using XRD and SEM. The calcined sample prior to sintering contained phases of the YMNO double perovskite and TiO2. Following sintering at 1400°C, the perovskite structure was replaced by Y2Ti2O7 fcc structure, and the grain size was found to increase with sintering time up to 18 hours. This sets a limit to the amount of TiO2 which can be used to successfully dope the YMNO ceramic.
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2

Miniajluk-Gaweł, Natalia, Robert Tomala, Bartosz Bondzior i Przemysław Jacek Dereń. "Influence of Sintering Parameters on Spectroscopic Properties of BMW: Eu3+ Ceramic Materials Prepared by HPLT Technique". Materials 15, nr 21 (22.10.2022): 7410. http://dx.doi.org/10.3390/ma15217410.

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In this work, Ba2MgWO6: Eu3+ (BMW: Eu3+) ceramic materials with a double perovskite structure were sintered using the High-Pressure Low-Temperature sintering (HPLT) technique. As part of the research, the influence of pressure (CP), sintering temperature (CT), and sintering time (CTS) on the structure and luminescence of the doped BMW were determined. Structural analysis via XRD and SEM + EDS and spectroscopic analysis via emission and excitation spectra, decay time, and absorption spectra of the obtained ceramics were performed. Dense double perovskite ceramics were obtained with a cubic structure with optimal sintering parameters: T = 500 °C, p = 8 GPa, and t = 1 min. The increase in temperature caused an increased extinction of the luminescence due to the diffusion of carbon into the ceramics. The increase in pressure led to the formation of the amorphous phase, which increased the speed of non-radiative transitions and also led to the extinction of the luminescence. The increase in sintering time from 1 to 3 min enhanced the luminescence output, but when the ceramic was sintered for 5 min, the luminescence was quenched, most likely by increasing the rate of the non-radiative process, as evidenced by reduced decay time.
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Zhou, Chuan, Jaka Sunarso, Yufei Song, Jie Dai, Junxing Zhang, Binbin Gu, Wei Zhou i Zongping Shao. "New reduced-temperature ceramic fuel cells with dual-ion conducting electrolyte and triple-conducting double perovskite cathode". Journal of Materials Chemistry A 7, nr 21 (2019): 13265–74. http://dx.doi.org/10.1039/c9ta03501j.

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4

Park, Cheol Woo, i Hyo Jin Seo. "Self-activated luminescence characteristics of double perovskite ceramic Sr2ZrCeO6". Ceramics International 40, nr 1 (styczeń 2014): 2495–99. http://dx.doi.org/10.1016/j.ceramint.2013.07.061.

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5

Hu, Dingyue, Junyoung Kim, Hongjun Niu, Luke M. Daniels, Troy D. Manning, Ruiyong Chen, Bowen Liu, Richard Feetham, John B. Claridge i Matthew J. Rosseinsky. "High-performance protonic ceramic fuel cell cathode using protophilic mixed ion and electron conducting material". Journal of Materials Chemistry A 10, nr 5 (2022): 2559–66. http://dx.doi.org/10.1039/d1ta07113k.

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High-performance and stability for protonic ceramic fuel cell cathode applications are realised in a self-assembled nanocomposite material Ba0.5Sr0.5(Co0.7Fe0.3)0.6875W0.3125O3−δ (BSCFW) through interplay of single and double perovskite phases.
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6

Iranmanesh, M., M. Lingg, M. Stir i J. Hulliger. "Sol gel and ceramic synthesis of Sr2FeMo1−xWxO6 (0 ≤ x ≤ 1) double perovskites series". RSC Advances 6, nr 48 (2016): 42069–75. http://dx.doi.org/10.1039/c6ra03923e.

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7

Parida, R. K., D. K. Pattanayak, Bhagyashree Mohanty, Nimai C. Nayak i B. N. Parida. "Structural and optical properties of a revived Pb0.5Ba1.5BiVO6 perovskite oxide". Journal of Advanced Dielectrics 09, nr 01 (luty 2019): 1950004. http://dx.doi.org/10.1142/s2010135x19500048.

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The polycrystalline ceramic Pb[Formula: see text]Ba[Formula: see text]BiVO6 manifesting the complex double perovskite structure was tailored by the conventional solid state route at a moderate temperature. Qualitative phase analysis and formation of the ceramic were affirmed by XRD analysis. The X-ray powder diffraction pattern of the compound explored at room temperature affirms the single phase formation with double perovskite structure exhibiting rhombohedral phase. Microstructural analysis of the studied compound procured from the Scanning Electron Microscope (SEM) validates the formation of dense microstructures and nonuniformly distributed grains with minimal voids. Compositional analysis was shaped through the Electron Diffraction Spectroscopy (EDS) confirming the absence of contamination of any other metals apart from the mentioned ones. Dielectric (Cr and [Formula: see text]) parameters of the compound were studied using the LCR analyzer at different temperatures and wide range of frequencies. The polarization and dielectric study affirms the presence of ferroelectricity in the material with transition temperature much above the room temperature. The tangent dielectric loss of this sample being almost minimal at room temperature attributes it to find applications in different grounds of electronics. Optical equities of the ceramic were further analyzed by the RAMAN, FTIR, UV–Vis and Photoluminescence spectroscopy.
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8

Ivanov, Ivan L., Petr O. Zakiryanov, Vladimir V. Sereda, Maxim O. Mazurin, Dmitry A. Malyshkin, Andrey Yu Zuev i Dmitry S. Tsvetkov. "Nonstoichiometry, Defect Chemistry and Oxygen Transport in Fe-Doped Layered Double Perovskite Cobaltite PrBaCo2−xFexO6−δ (x = 0–0.6) Membrane Materials". Membranes 12, nr 12 (28.11.2022): 1200. http://dx.doi.org/10.3390/membranes12121200.

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Mixed conducting cobaltites PrBaCo2−xFexO6−δ (x = 0–0.6) with a double perovskite structure are promising materials for ceramic semi-permeable membranes for oxygen separation and purification due to their fast oxygen exchange and diffusion capability. Here, we report the results of the detailed study of an interplay between the defect chemistry, oxygen nonstoichiometry and oxygen transport in these materials as a function of iron doping. We show that doping leads to a systematic variation of both the thermodynamics of defect formation reactions and oxygen transport properties. Thus, iron doping can be used to optimize the performance of mixed conducting oxygen-permeable double perovskite membrane materials.
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9

Ding, Hanping, Neal P. Sullivan i Sandrine Ricote. "Double perovskite Ba2FeMoO6−δ as fuel electrode for protonic-ceramic membranes". Solid State Ionics 306 (sierpień 2017): 97–103. http://dx.doi.org/10.1016/j.ssi.2017.04.007.

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10

Mahato, Dev K., Sujoy Saha i T. P. Sinha. "Impedance, scaling behavior and conduction mechanism in double perovskite Pr2CuZrO6 ceramic". Journal of Materials Science: Materials in Electronics 27, nr 4 (20.01.2016): 3845–53. http://dx.doi.org/10.1007/s10854-015-4232-4.

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11

Huang, Wenlong, Yushi Ding, Ying Li i Zezhong Wang. "Conduction properties and transport number of double perovskite barium tantalate ceramic". Journal of Alloys and Compounds 851 (styczeń 2021): 156901. http://dx.doi.org/10.1016/j.jallcom.2020.156901.

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12

Liu, Sheng, Feng Xiang, Yulan Cheng, Yajun Luo i Jing Sun. "Multiferroic and Magnetodielectric Effects in Multiferroic Pr2FeAlO6 Double Perovskite". Nanomaterials 12, nr 17 (30.08.2022): 3011. http://dx.doi.org/10.3390/nano12173011.

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Single-phase multiferroics that allow the coexistence of ferroelectric and magnetic ordering above room temperature are highly desirable, and offer a fundamental platform for novel functionality. In this work, a double perovskite multiferroic Pr2FeAlO6 ceramic is prepared using a sol-gel process followed by a quenching treatment. The well-crystallized and purified Pr2FeAlO6 in trigonal structure with space group R3c is confirmed. A combination of the ferroelectric (2Pr = 0.84 μC/cm2, Ec = 7.78 kV/cm at an applied electric field of 20 kV/cm) and magnetic (2Mr = 433 memu/g, Hc = 3.3 kOe at an applied magnetic field of 1.0 T) hysteresis loops reveals the room-temperature multiferroic properties. Further, the magnetoelectric effect is observed from the measurements of magnetically induced dielectric response and polarization. The present results suggest a new complex oxide candidate for room-temperature multiferroic applications.
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13

Mtougui, S., I. EL Housni, N. EL Mekkaoui, S. Ziti, S. Idrissi, H. Labrim, R. Khalladi i L. Bahmad. "Magnetic properties of La2CuMnO6 double perovskite ceramic investigated by Monte Carlo simulations". Chinese Physics B 29, nr 5 (maj 2020): 056101. http://dx.doi.org/10.1088/1674-1056/ab7d95.

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14

Borchani, S. Megdiche, i M. Megdiche. "Electrical properties and conduction mechanism in the NaLaMnMoO 6 double perovskite ceramic". Journal of Physics and Chemistry of Solids 114 (marzec 2018): 121–28. http://dx.doi.org/10.1016/j.jpcs.2017.11.022.

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15

Khopkar, Vijay, i Balaram Sahoo. "Low temperature dielectric properties and NTCR behavior of the BaFe0.5Nb0.5O3 double perovskite ceramic". Physical Chemistry Chemical Physics 22, nr 5 (2020): 2986–98. http://dx.doi.org/10.1039/c9cp05707b.

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The microstructure and low-temperature dielectric properties of lead-free BaFe0.5Nb0.5O3 ceramics exhibiting a negative temperature coefficient of resistance behavior.
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16

Pan, Tianze, Ji Zhang, Dongxiao Che, Zhengyu Wang, Jiajia Wang, Jing Wang i Yaojin Wang. "Improved capacitive energy storage in sodium niobate-based relaxor antiferroelectric ceramics". Applied Physics Letters 122, nr 7 (13.02.2023): 072902. http://dx.doi.org/10.1063/5.0134282.

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Ceramic-based dielectric capacitors have become an attractive issue due to their wide applications in current pulsed-/high-power electronic devices. Antiferroelectric ceramics generally exhibit ultrahigh energy density owing to their giant polarization activated by antiferroelectric–ferroelectric phase transition under a high electric field but suffer from large hysteresis, meanwhile giving rise to low efficiency. Herein, by introducing perovskite compound Sr(Fe0.5Ta0.5)O3 into an antiferroelectric NaNbO3 matrix, a stabilized antiferroelectric phase and an improved relaxor behavior are observed. That is, relaxor antiferroelectric ceramics are constructed. Accordingly, a double polarization–electric field ( P–E) loop becomes slimmer with increasing incorporation of dopants, leading to an ultrahigh recoverable energy density of 11.5 J/cm3, an energy storage efficiency of 86.2%, outstanding frequency/cycling/thermal reliability, and charge–discharge properties in 0.90NaNbO3-0.10Sr(Fe0.5Ta0.5)O3 ceramics. This work reveals that inducing the relaxor behavior in antiferroelectric materials is an effective route to improve their capacitive energy storage.
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17

Gorkusha, Aleksandr S., Sergey V. Tsybulya, Svetlana V. Cherepanova, Evgeny Y. Gerasimov i Svetlana N. Pavlova. "Nonstoichiometry Defects in Double Oxides of the A2BO4-Type". Materials 15, nr 21 (31.10.2022): 7642. http://dx.doi.org/10.3390/ma15217642.

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Double oxides with the structure of the Ruddlesden–Popper (R-P) layered perovskite An+1BnO3n+1 attract attention as materials for various electrochemical devices, selective oxygen-permeable ceramic membranes, and catalytic oxidative reactions. In particular, Sr2TiO4 layered perovskite is considered a promising catalyst in the oxidative coupling of methane. Our high-resolution transmission electron microscopy (HRTEM) studies of Sr2TiO4 samples synthesized using various methods have shown that their structure often contains planar defects disturbing the periodicity of layer alternation. This is due to the crystal-chemical features of the R-P layered perovskite-like oxides whose structure is formed by n consecutive layers of perovskite (ABO3)n in alternating with layers of rock-salt type (AO) in various ways along the c crystallographic direction. Planar defects can arise due to a periodicity violation of the layers alternation that also leads to a violation of the synthesized phase stoichiometry. In the present work, a crystallochemical analysis of the possible structure of planar defects is carried out, structures containing defects are modeled, and the effect of such defects on the X-ray diffraction patterns of oxides of the A2BO4 type using Sr2TiO4 is established as an example. For the calculations, we used the method of constructing probabilistic models of one-dimensionally disordered structures. For the first time, the features of diffraction were established, and an approach was demonstrated for determining the concentration of layer alternation defects applicable to layered perovskite-like oxides of the A2BO4 type of any chemical composition. A relation has been established between the concentration of planar defects and the real chemical composition (nonstoichiometry) of the Sr2TiO4 phase. The presence of defects leads to the Ti enrichment of particle volume and, consequently, to the enrichment of the surface with Sr. The latter, in turn, according to the data of a number of authors, can serve as an explanation for the catalytic activity of Sr2TiO4 in the oxidative coupling of methane.
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18

Vittayakorn, Naratip, Gobwute Rujijanagul, Tawee Tunkasiri, Xiaoli Tan i David P. Cann. "Perovskite phase formation and ferroelectric properties of the lead nickel niobate–lead zinc niobate–lead zirconate titanate ternary system". Journal of Materials Research 18, nr 12 (grudzień 2003): 2882–89. http://dx.doi.org/10.1557/jmr.2003.0402.

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The ternary system of lead nickel niobate Pb(Ni1/3Nb2/3)O3 (PNN), lead zinc niobate Pb(Zn1/3Nb2/3)O3 (PZN), and lead zirconate titanate Pb(Zr1/2Ti1/2)O3 (PZT) was investigated to determine the influence of different solid state processing conditions on dielectric and ferroelectric properties. The ceramic materials were characterized using x-ray diffraction, dielectric measurements, and hysteresis measurements. To stabilize the perovskite phase, the columbite route was utilized with a double crucible technique and excess PbO. The phase-pure perovskite phase of PNN–PZN–PZT ceramics was obtained over a wide compositional range. It was observed that for the ternary system 0.5PNN–(0.5 - x)PZN–xPZT, the change in the transition temperature (Tm) is approximately linear with respect to the PZT content in the range x [H11505] 0 to 0.5. With an increase in x, Tm shifts up to high temperatures. Examination of the remanent polarization (Pr) revealed a significant increase with increasing x. In addition, the relative permittivity ([H9280]r) increased as a function of x. The highest permittivities ([H9280]r [H11505] 22,000) and the highest remanent polarization (Pr [H11505] 25 μC/cm2) were recorded for the binary composition 0.5Pb(Ni1/3Nb2/3)O3–0.5Pb(Zr1/2Ti1/2)O3.
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19

Borchani, Sameh Megdiche, Wissem Cheikh-Rouhou Koubaa i Makrem Megdiche. "Structural, magnetic and electrical properties of a new double-perovskite LaNaMnMoO 6 material". Royal Society Open Science 4, nr 11 (listopad 2017): 170920. http://dx.doi.org/10.1098/rsos.170920.

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Structural, magnetic, magnetocaloric, electrical and magnetoresistance properties of an LaNaMnMoO 6 powder sample have been investigated by X-ray diffraction (XRD), magnetic and electrical measurements. Our sample has been synthesized using the ceramic method. Rietveld refinements of the XRD patterns show that our sample is single phase and it crystallizes in the orthorhombic structure with Pnma space group. Magnetization versus temperature in a magnetic applied field of 0.05 T shows that our sample exhibits a paramagnetic–ferromagnetic transition with decreasing temperature. The Curie temperature T C is found to be 320 K. Arrott plots show that all our double-perovskite oxides exhibit a second-order magnetic phase transition. From the measured magnetization data of an LaNaMnMoO 6 sample as a function of the magnetic applied field, the associated magnetic entropy change |−ΔSM| and the relative cooling power (RCP) have been determined. In the vicinity of T C , |−ΔSM| reached, in a magnetic applied field of 8 T, a maximum value of ∼4 J kg −1 K −1 . Our sample undergoes a large magnetocaloric effect at near-room temperature. Resistivity measurements reveal the presence of an insulating-metal transition at Tρ = 180 K. A magnetoresistance of 30% has been observed at room temperature for 6 T, significantly larger than that reported for the A 2 FeMoO 6 (A = Sr, Ba) double-perovskite system.
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20

Wang, Jin Fei, Tong Qing Yang, K. Wei, G. Li i Yong Xiang Li. "Influence of Zr/Sn Ratio Electric Properties of PLZST Ceramic". Key Engineering Materials 547 (kwiecień 2013): 101–5. http://dx.doi.org/10.4028/www.scientific.net/kem.547.101.

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(Pb0.97La0.02)(Zr0.92-xSnxTi0.08)O3 (PLZST) ferroelectric ceramics with x=0.40, 0.25, 0.15, respectively, were investigated. It was found that these ceramics with different Zr:Sn ratios were perovskite structure. With increasing of Zr:Sn ratio, the phase-transition electric-field of antiferroelectric to ferroelectric phase increased. when x>0.15,All the samples have double hysteresis loops with antiferroelectric phase characteristics. Yet, when the electric field was removed at lower temperature of -5oC and -20oC, for x=0.25 and 0.40, the electric field induced FE phase can remain metastable FE state. But for x=0.15, the induced FE phase recover to AFE phase even at -20oC. Yet, electric field induced FE phase exist as metastable FE phase. TFE-AFE of the samples was -5oC, -20oC, when x=0.40, x=0.25, respectively. With increasing of Zr:Sn ratio, TFE-AFE increaseddecreased, Tc was hardly changed, but the dielectric constant increased from ~2500 to ~6000, the peak changed sharply, dielectric loss increased continuously with increasing of Zr:Sn ratio.
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21

Vøllestad, Einar, Ragnar Strandbakke, Mateusz Tarach, David Catalán-Martínez, Marie-Laure Fontaine, Dustin Beeaff, Daniel R. Clark, Jose M. Serra i Truls Norby. "Mixed proton and electron conducting double perovskite anodes for stable and efficient tubular proton ceramic electrolysers". Nature Materials 18, nr 7 (3.06.2019): 752–59. http://dx.doi.org/10.1038/s41563-019-0388-2.

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22

Téllez Lozano, Helena, John Druce, Samuel J. Cooper i John A. Kilner. "Double perovskite cathodes for proton-conducting ceramic fuel cells: are they triple mixed ionic electronic conductors?" Science and Technology of Advanced Materials 18, nr 1 (4.12.2017): 977–86. http://dx.doi.org/10.1080/14686996.2017.1402661.

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23

Chen, Huiling, Chao Xing, Jianzhu Li, Hengyang Qiao, Jun Yang, Qingkun He, Helei Dong i in. "Crystal structure, phonon characteristic, and intrinsic properties of Sm(Mg1/2Sn1/2)O3 double perovskite ceramic". Journal of Materials Science: Materials in Electronics 28, nr 19 (24.06.2017): 14156–62. http://dx.doi.org/10.1007/s10854-017-7269-8.

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24

Suchaneck, Gunnar, i Evgenii Artiukh. "Absence of Weak Localization Effects in Strontium Ferromolybdate". Applied Sciences 13, nr 12 (13.06.2023): 7096. http://dx.doi.org/10.3390/app13127096.

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Sr2FeMoO6-δ (SFMO) double perovskite is a promising candidate for room-temperature spintronic applications, since it possesses a half-metallic character (with theoretically 100% spin polarization), a high Curie temperature of about 415 K and a low-field magnetoresistance (LFMR). The magnetic, resistive and catalytic properties of the double perovskite SFMO are excellent for spintronic (non-volatile memory), sensing, fuel cell and microwave absorber applications. However, due to different synthesis conditions of ceramics and thin films, different mechanisms of electrical conductivity and magnetoresistance prevail. In this work, we consider the occurrence of a weak localization effect in SFMO commonly obtained in disordered metallic or semiconducting systems at very low temperatures due to quantum interference of backscattered electrons. We calculate the quantum corrections to conductivity and the contribution of electron scattering to the resistivity of SFMO. We attribute the temperature dependence of SFMO ceramic resistivity in the absence of a magnetic field to the fluctuation-induced tunneling model. We also attribute the decreasing resistivity in the temperature range from 409 K to 590 K to adiabatic small polaron hopping and not to localization effects. Neither fluctuation-induced tunneling nor adiabatic small polaron hopping favors quantum interference. Additionally, we demonstrate that the resistivity upturn behavior of SFMO cannot be explained by weak localization. Here, the fitted model parameters have no physically meaningful values, i.e., the fitted weak localization coefficient (B′) was three orders of magnitude lower than the theoretical coefficient, while the fitted exponent (n) of the electron–electron interaction term (CnTn) could not be assigned to a specific electron-scattering mechanism. Consequently, to the best of our knowledge, there is still no convincing evidence for the presence of weak localization in SFMO.
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Zhang, Junxing, Zhenbao Zhang, Yubo Chen, Xiaomin Xu, Chuan Zhou, Guangming Yang, Wei Zhou i Zongping Shao. "Materials design for ceramic oxygen permeation membranes: Single perovskite vs. single/double perovskite composite, a case study of tungsten-doped barium strontium cobalt ferrite". Journal of Membrane Science 566 (listopad 2018): 278–87. http://dx.doi.org/10.1016/j.memsci.2018.09.004.

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Strandbakke, Ragnar, Vladimir A. Cherepanov, Andrey Yu Zuev, Dmitry S. Tsvetkov, Christos Argirusis, Georgia Sourkouni, Stephan Prünte i Truls Norby. "Gd- and Pr-based double perovskite cobaltites as oxygen electrodes for proton ceramic fuel cells and electrolyser cells". Solid State Ionics 278 (październik 2015): 120–32. http://dx.doi.org/10.1016/j.ssi.2015.05.014.

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27

Feng, J., Z. C. Huang, R. Zhou i W. Pan. "Anisotropic Mechanical and Thermal Properties of Nd2SrAl2O7". Key Engineering Materials 512-515 (czerwiec 2012): 975–79. http://dx.doi.org/10.4028/www.scientific.net/kem.512-515.975.

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For a long time since the anisotropy basically confined to a single crystal, used as a polycrystalline ceramic materials generally considered to be isotropic. In this paper, the anisotropic mechanical, thermal expansion coefficient and thermal conductivity of a double perovskite slab-rocksalt layer Nd2SrAl2O7 was studied by first principles as an example. The method is using density functional theory (DFT) and crystal parameters, which has been used to calculate the modulus of elasticity of anisotropic in a three-dimensional space. While combined with traditional thermal conductivity theory, we have obtained the tensor of thermal diffusion, thermal conductivity in 3D space for the first time in the world within no. The results are in good agreement with the experiment. The advantage of method is avoiding the difficulty of experimental measurement, reducing the time and obtaining relatively accurate results.
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28

BELAVI, P. B., G. N. CHAVAN, L. R. NAIK i R. K. KOTNALA. "GRAIN SIZE DEPENDENT DIELECTRIC AND MAGNETIC PROPERTIES OF (Y) NCCF+(1 – Y) BTO PARTICULATE COMPOSITES". International Journal of Nanoscience 11, nr 03 (czerwiec 2012): 1240007. http://dx.doi.org/10.1142/s0219581x12400078.

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The particulate composites with general formula (y) Ni 0.85 Cd 0.1 Cu 0.05 Fe 2 O 4 + (1 - y) BaTiO 3, (0.0 < y < 1.0) were synthesized by conventional double sintering ceramic technique. The formation of cubic spinel structure in ferrite phase and tetragonal perovskite structure in ferroelectric phase was confirmed by X-ray diffraction (XRD) measurements. The surface morphology with average grain size of the composites was studied by SEM measurements. The study of variation of dielectric constant with frequency (20 Hz to 1 MHz) shows dielectric dispersion behavior in the low frequency region and almost constant at high frequency region. The linear variation in a.c conductivity with frequency shows small polaron type of conduction mechanism in the composites. The vibrating sample magnetometer (VSM) was used to study the magnetic properties such as saturation magnetization and magnetic moment.
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Chen, Shun Sheng, Da Wei Shi, Hong Xia Wang, Chang Ping Yang, Hai Bo Xiao, Bärner Klaus i Vyachslav Medvedeva. "Magnetically Correlated Schottky Barrier in the La1.8Ca1.2Mn2O7 Double-Layered Perovskite Ceramic". Advanced Materials Research 873 (grudzień 2013): 744–47. http://dx.doi.org/10.4028/www.scientific.net/amr.873.744.

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Double-layered La1.8Ca1.2Mn2O7sample with a perovskite structure was synthesized by solid state reaction and electrical transport properties were investigated using 4-wire direct current (DC) and 2-wire alternating current (AC) measurement methods. The result reveals that the I-V characteristic of the La1.8Ca1.2Mn2O7ceramic exhibits a linear behaviour above Curie temperature (TC) while it shows a strong nonlinearity below TC. The nonlinear coefficient increases with decreasing temperatures and reaches a maximum of 60.5 at 14 K for the limit of the experiment. We believe that a magnetically correlated Schottky barrier forming at the grain boundary is the main factor to control the transport properties for the La1.8Ca1.2Mn2O7ceramic.
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Yagovitin, Roman E., Dmitry S. Tsvetkov, Ivan L. Ivanov, Dmitry A. Malyshkin, Vladimir V. Sereda i Andrey Yu Zuev. "Thermodynamics of Formation and Disordering of YBaCo2O6-δ Double Perovskite as a Base for Novel Dense Ceramic Membrane Materials". Membranes 13, nr 1 (21.12.2022): 10. http://dx.doi.org/10.3390/membranes13010010.

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Differential scanning calorimetry studies of the complex oxide YBaCo2O6-δ (YBC), combined with the literature data, allowed outlining the phase behavior of YBC depending on the oxygen content and temperature between 298 K and 773 K. The oxygen nonstoichiometry of single-phase tetragonal YBC was measured at different temperatures and oxygen partial pressures by both thermogravimetric and flow reactor methods. The defect structure of YBC was analyzed. As a result, the thermodynamic functions (ΔHi○, ΔSi○) of the defect reactions in YBC were determined. Experimental data on the oxygen content and those calculated based on the theoretical model were shown to be in good agreement. Standard enthalpies of formation at 298.15 K (ΔHf○) were obtained for YBC depending on its oxygen content using solution calorimetry. It was found that ΔHf○ = f(6-δ) function is linear in the range of (6-δ) from 5.018 to 5.406 and that its slope is close to the value of the enthalpy of the quasichemical reaction describing oxygen exchange between the oxide and ambient atmosphere, which confirms the reliability of the suggested defect structure model.
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31

Najar, Feroz A., Shohaib Abass, Khalid Sultan, Mubashir A. Kharadi, Gul Faroz A. Malik i Rubiya Samad. "Comparative study of optical properties of substitutionally doped La2NiMnO6 double perovskite ceramic: A potential candidate for solar cells and dielectrics". Physica B: Condensed Matter 621 (listopad 2021): 413311. http://dx.doi.org/10.1016/j.physb.2021.413311.

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Stobierska, Ewa, Mirosław M. Bućko, Jerzy Lis i Katarzyna Kuźmińska. "Colour Properties of Y2O3-Al2O3-Cr2O3 Pigments as a Result of Precursors Morphology". Advances in Science and Technology 68 (październik 2010): 202–7. http://dx.doi.org/10.4028/www.scientific.net/ast.68.202.

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Double yttrium-aluminium oxide with perovskite structure (YAP) doped with chromium(III) ions seems to be a promising material for red pigments for new ceramic bodies and glazes. The aim of the present paper was to examine the influence of the precursors morphology on colour properties of the YAP pigments. Two kinds of aluminium hydroxide powders were used, fine- and coarse-grained. The fine Al(OH)3 powder was amorphous with D50=4.58 µm and the coarse one was crystalline gibbsite with D50=42.4 µm. It was stated that using of aluminium hydroxide powders of different morphology led to substantial differences in phase composition of the final materials. Using coarse-grained aluminium hydroxide powder caused formation of over 95 wt% of YAP phase whereas the pigments prepared with amorphous aluminium hydroxide contain significant amounts of other phases in the Y2O3-Al2O3 system. The differences in phase compositions resulted in differences in colour properties of the pigments.
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33

Roy, Ansu, Kamal Prasad i Ashutosh Prasad. "Piezoelectric, impedance, electric modulus and AC conductivity studies on (Bi0.5Na0.5)0.95Ba0.05TiO3 ceramic". Processing and Application of Ceramics 7, nr 2 (2013): 81–91. http://dx.doi.org/10.2298/pac1302081r.

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Lead-free piezoelectric perovskite ceramic (Bi0.5Na0.5)0.95Ba0.05TiO3 (BNT-BT0.05), prepared by conventional high temperature solid state reaction technique at 1160?C/3h in air atmosphere, is investigated by impedance and modulus spectroscopy in a temperature range 35-400?C, over a frequency range 100 Hz-1 MHz. The crystal structure, microstructure, and piezoelectric properties as well as the AC conductivity of the sample were studied. Powder X-ray diffraction pattern derived from the resulting data at the room temperature subjected to Rietveld refinements and Williamson-Hall plot analysis confirmed the formation of phase pure compound with monoclinic unit cells having a crystallite-size ~33.8 nm. Observed SEM micrograph showed a uniform distribution of grains inside the sample having an average grain size ~3 mm. Longitudinal piezoelectric charge coefficient of the sample poled under a DC electric field of ~ 2.5 kV/mm at 80?C in a silicone oil bath was found to be equal to 95 pC/N. The frequency and temperature dependent electrical data analyzed in the framework of AC conductivity, complex impedance as well as electric modulus formalisms showed negative temperature coefficient of resistance (NTCR) character of the material and the dielectric relaxation in the material to be of non-Debye type. Double power law for the frequency-dependence of AC conductivity and Jump Relaxation Model (JRM) were found to explain successfully the mechanism of charge transport in BNT-BT0.05.
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Pannu, Kanwar G. S., Tania Pannu, Tobias Fürstenhaupt i Venkataraman Thangadurai. "Electrical properties of ionic liquid and double perovskite-type metal oxide composites — A new method to tailor grain-boundary impedance of ceramic electrolytes". Solid State Ionics 232 (luty 2013): 106–11. http://dx.doi.org/10.1016/j.ssi.2012.11.009.

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35

Khalyavin, D. D., Jiaping Han, A. M. R. Senos i P. Q. Mantas. "Synthesis and dielectric properties of tungsten-based complex perovskites". Journal of Materials Research 18, nr 11 (listopad 2003): 2600–2607. http://dx.doi.org/10.1557/jmr.2003.0364.

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Ba2MeWO6 (Me=Mg, Ni, Zn) double perovskites were prepared by the conventional solid-state reaction in a wide temperature range. Single-phase ceramics were obtained only at low temperatures approximately 1200°C, whereas a small amount of second phases existed in the samples sintered at higher temperatures. All the compounds are characterized by the cubic perovskite structure (space group Fm3m) with a complete NaCl type ordering between B-site ions. Anomalous temperature variation of the dielectric loss tangent found in the Ba2NiWO6 perovskite is supposed to be connected with a dielectric relaxation due to electronic hopping within thermally activated Ni3+-6W(6-1/6)+/W5+-6Ni(2+1/6)+ clusters. Dielectric measurements showed that the other two perovskites—Ba2ZnWO6 and Ba2MgWO6—exhibit a positive value of the temperature coefficient of permittivity. Such temperature variation is assumed to be caused by a considerable influence of the second polar mode involving B-site ion vibrations on the low-frequency dielectric properties.
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36

Yao, Yunpeng, Bo Kou, Yu Peng, Zhenyue Wu, Lina Li, Sasa Wang, Xinyuan Zhang, Xitao Liu i Junhua Luo. "(C3H9NI)4AgBiI8: a direct-bandgap layered double perovskite based on a short-chain spacer cation for light absorption". Chemical Communications 56, nr 21 (2020): 3206–9. http://dx.doi.org/10.1039/c9cc07796k.

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A new iodide layered double perovskite (C3H9NI)4AgBiI8 (IPAB) has been developed based on a short-chain spacer cation, which is the first homologous compound in iodide double perovskites that adopt the Ruddlesden–Popper structure type.
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37

Miniajluk-Gaweł, Natalia, Bartosz Bondzior, Karol Lemański, Thi Hong Quan Vu, Dagmara Stefańska, Remy Boulesteix i Przemysław Jacek Dereń. "Effect of Ceramic Formation on the Emission of Eu3+ and Nd3+ Ions in Double Perovskites". Materials 14, nr 20 (12.10.2021): 5996. http://dx.doi.org/10.3390/ma14205996.

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Herein, the structure, morphology, as well as optical properties of the powder and ceramic samples of Ba2MgWO6 are presented. Powder samples were obtained by high temperature solid-state reaction, while, for the ceramics, the SPS technique under 50-MPa pressure was applied. The morphology of the investigated samples showed some agglomeration and grains with a submicron size of 490–492 µm. The theoretical density and relative density of ceramics were calculated using the Archimedes method. The influence of sample preparation on the position, shape, and character of the host, as well as dopants emission was investigated. Sample sintering enhances regular emission of WO6 groups causing a blue shift of Ba2MgWO6 emission. Nonetheless, under X-ray excitation, only the green emission of inversion WO6 group was detected. For the ceramic doped with Eu3+ ions, the emission of both host and dopant was detected. However, for the powder efficient host to activator energy, the transfer process occurred, and only the magnetic dipole emission of Eu3+ was detected. The intensity of Nd3+ ions of Ba2MgWO6 powder sample is five times higher than for the ceramic. The sintering process reduces inversion defects and creates a highly symmetrical site of neodymium ions. The emission of Ba2MgWO6:Nd3+ consists of transitions from the 4F3/2 excited level to the 4IJ multiplet states with the dominance of the 4F3/2→4I11/2 one. The spectroscopic quality parameter and branching ratio of Nd3+ emission are presented.
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PALEI, P., i P. KUMAR. "IMPEDANCE SPECTROSCOPY AND AC CONDUCTIVITY STUDIES OF FERROELECTRIC (K0.5Na0.5)NbO3 CERAMICS". Journal of Advanced Dielectrics 01, nr 03 (lipiec 2011): 351–56. http://dx.doi.org/10.1142/s2010135x11000446.

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Lead free (K0.5Na0.5)NbO3 (KNN) ceramics were prepared by conventional solid state reaction route. For single perovskite phase formation, calcination temperature was optimized at 850°C for 6 h, whereas for dense morphology the sintering of the ceramic was carried out at 1120°C for 4 h. X-ray diffraction XRD analysis confirmed the formation of single phase with orthorhombic structure at room temperature. Impedance analysis and AC conductivity studies of the KNN sample was carried out in the temperature range of 703–773 K. Impedance study showed the increase in conducting behavior at higher temperature. The temperature dependence of AC conductivity indicated that the conduction process is due to doubly ionized oxygen vacancies in the higher temperature region.
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39

Castro, Manoel Carvalho, Carlos William de Araujo Paschoal, Frank C. Snyder i Michael W. Lufaso. "Relaxations in Ba2BiSbO6 double complex perovskite ceramics". Journal of Applied Physics 104, nr 10 (15.11.2008): 104114. http://dx.doi.org/10.1063/1.3026654.

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40

Yang, W. Z., M. M. Mao, X. Q. Liu i X. M. Chen. "Structure and dielectric relaxation of double-perovskite La2CuTiO6 ceramics". Journal of Applied Physics 107, nr 12 (15.06.2010): 124102. http://dx.doi.org/10.1063/1.3446846.

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Lin, Y. Q., X. M. Chen i X. Q. Liu. "Relaxor-like dielectric behavior in La2NiMnO6 double perovskite ceramics". Solid State Communications 149, nr 19-20 (maj 2009): 784–87. http://dx.doi.org/10.1016/j.ssc.2009.02.028.

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Albutt, Naphat, Vanussanun Aitviriyaphan, Thanapong Sareein, Sudarath Suntaropas, Panakamon Thonglor, Suejit Pechprasarn, Sangwoei Sawekwiharee, Wirote Ritthong i Supree Pinitsoontorn. "Characterization of Antiferromagnetism in Double Perovskites Ba2FeMoO6 Prepared by Solid State Method". Applied Mechanics and Materials 891 (maj 2019): 224–29. http://dx.doi.org/10.4028/www.scientific.net/amm.891.224.

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The magnetic properties of Ba2FeMoO6 (BFMO) double perovskite are investigated. BFMO samples were prepared by solid state reaction method through compression. Magnetic properties are influenced by electron environments of the Fe3+ and Mo5+ ions within the perovskite structure. BFMO sintered at 800 oC exhibited the largest hysteresis loop at 50 K. In addition, the values of Ms and Mr indicate ferromagnetic behaviour in BFMO ceramics sintered at 800 oC for different times up to 10 hours. Using the Curie-Weiss law fitting to investigate μeff~30μB high spin of Fe and Mo, and negative θ present the antiferromagnetic characteristics of the BFMO sample.
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43

LIN, Y. Q., S. Y. WU i X. M. CHEN. "EFFECTS OF ORDERING DOMAIN STRUCTURE ON DIELECTRIC PROPERTIES OF DOUBLE PEROVSKITE La2NiMnO6". Journal of Advanced Dielectrics 01, nr 03 (lipiec 2011): 319–24. http://dx.doi.org/10.1142/s2010135x1100046x.

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Two sets of La2NiMnO6 ceramics with different B-site ordering degree were prepared and evaluated. The valence states of Ni2+ and Mn4+ were confirmed, and the B-site ordering degree was estimated qualitatively using magnetic and Raman analysis. The ordering of Ni2+ and Mn4+ was the primary origin for the relaxor-like behavior of the present ceramics. The ordering degree of B-site ions greatly affected the dielectric properties, i.e., more ordered sample indicated higher dielectric constant. Meanwhile, the grain boundary layer capacitor (GBLC) effect was also activated but limited at the high temperatures and low frequencies.
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Prasatkhetragarn, A., S. Kaowphong i R. Yimnirun. "Synthesis, structural and electrical properties of double perovskite Sr2NiMoO6 ceramics". Applied Physics A 107, nr 1 (23.12.2011): 117–21. http://dx.doi.org/10.1007/s00339-011-6744-y.

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Mahato, Dev K., i T. P. Sinha. "Dielectric, Impedance and Conduction Behavior of Double Perovskite Pr2CuTiO6 Ceramics". Journal of Electronic Materials 46, nr 1 (17.08.2016): 107–15. http://dx.doi.org/10.1007/s11664-016-4842-5.

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GAN, Hui, Chuan-Bin WANG, Qiang SHEN i Lian-Meng ZHANG. "Preparation of La2NiMnO6 Double-perovskite Ceramics by Plasma Activated Sintering". Journal of Inorganic Materials 34, nr 5 (2019): 541. http://dx.doi.org/10.15541/jim20180291.

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Mahato, Dev K., A. Dutta i T. P. Sinha. "Synthesis and electric characterization of rare earth double perovskite Ho2CdZrO6 ceramics". Journal of Electroceramics 29, nr 2 (13.07.2012): 99–105. http://dx.doi.org/10.1007/s10832-012-9751-2.

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Mahato, Dev K., i T. P. Sinha. "Electrical impedance and electric modulus approach of double perovskite Pr2ZnZrO6 ceramics". Journal of Materials Science: Materials in Electronics 24, nr 11 (3.08.2013): 4399–405. http://dx.doi.org/10.1007/s10854-013-1416-7.

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Yi, Kang, Qingkai Tang, Zhiwei Wu i Xinhua Zhu. "Unraveling the Structural, Dielectric, Magnetic, and Optical Characteristics of Nanostructured La2NiMnO6 Double Perovskites". Nanomaterials 12, nr 6 (16.03.2022): 979. http://dx.doi.org/10.3390/nano12060979.

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Double perovskite La2NiMnO6 (LNMO) nanoparticles and nanorods were synthesized via a hydrothermal process, where only aqueous inorganic solvents are used to regulate the microscopic morphology of the products without using any organic template. They crystallized in a monoclinic (P21/n) double perovskite crystal structure. The LNMO nanoparticles exhibited spherical morphology with an average particle size of 260 ± 60 nm, and the LNMO nanorods had diameters of 430 ± 120 nm and length about 2.05 ± 0.65 μm. Dual chemical oxidation states of the Ni and Mn ions were confirmed in the LNMO samples by X-ray photoelectron spectroscopy. Strong frequency dispersion dielectric behavior observed in the LNMO ceramics, is attributed to the space charge polarization and the oxygen vacancy induced dielectric relaxation. A ferroelectric—paraelectric phase transition appearing near 262 K (or 260 K) in the LNMO ceramics prepared from nanoparticles (or nanorods) was identified to be a second-order phase transition. The LNMO samples are ferromagnetic at 5 K but paramagnetic at 300 K. The LNMO nanoparticles had larger saturation magnetization (MS = 6.20 μB/f.u. @ 5 K) than the LNMO nanorods (MS = 5.68 μB/f.u.) due to a lower structural disorder in the LNMO nanorods. The semiconducting nature of the nanostructured LNMO with an optical band gap of 0.99 eV was revealed by the UV–visible absorption spectra. The present results enable the nanostructured LNMO to be a promising candidate for practical spintronic devices.
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Xia, Bin, Xi Yun He, Da Zhi Sun, Wen Xiu Cheng, Ping Sun Qiu i Xia Zeng. "Evidence of Normal to Anti Ferroelectric Phase Transition of PLZT Transparent Ceramics of Different Zr/Ti Ratio". Key Engineering Materials 697 (lipiec 2016): 223–26. http://dx.doi.org/10.4028/www.scientific.net/kem.697.223.

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The lanthanum-modified lead zirconate titanate transparent ceramics with different Zr/Ti ratio were prepared by the hot pressing sintering method. A single perovskive structure with a dense microsctructure was obtained and the transgranular fracture of PLZT ceramics tended to be more serious As the Zr/Ti ratio increases, the transmittance of PLZT ceramics tended to be higher and the transgranular fracture became more serious. The P-E loops changed froe a square hysteresis loop to a double tending slim hysteresis loop. Besides,the S-E loops changed from a approximate parabolic shape to a butterfly shape. These two loops confirm the transition from normal ferroelectric to anti ferroelectric phase occured with the Zr/Ti ratio increasing.
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