Journal articles: 'SrFeOx'

1

Schmidt, M. "Mechanical and thermal carbonation of strontium ferrite SrFeOx." Materials Research Bulletin 37, no. 13 (October 2002): 2093–105. http://dx.doi.org/10.1016/s0025-5408(02)00898-x.

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2

Maljuk, A., J. Strempfer, C. Ulrich, A. Lebon, and C. T. Lin. "Growth and characterization of high-quality SrFeOx single crystals." Journal of Crystal Growth 257, no. 3-4 (October 2003): 427–31. http://dx.doi.org/10.1016/s0022-0248(03)01474-x.

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3

Kim, Hyoung Gyun, Ventaka Raveendra Nallagatla, Chang Uk Jung, Gyeong-Su Park, Deok-Hwang Kwon, and Miyoung Kim. "Understanding the Behavior of Oxygen Vacancies in an SrFeOx/Nb:SrTiO3 Memristor." Electronic Materials Letters 18, no. 2 (January 21, 2022): 168–75. http://dx.doi.org/10.1007/s13391-021-00334-4.

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4

Tian, Junjiang, Yang Zhang, Zhen Fan, Haijun Wu, Lei Zhao, Jingjing Rao, Zuhuang Chen, et al. "Nanoscale Phase Mixture and Multifield-Induced Topotactic Phase Transformation in SrFeOx." ACS Applied Materials & Interfaces 12, no. 19 (April 21, 2020): 21883–93. http://dx.doi.org/10.1021/acsami.0c03684.

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5

Takeda, Y., K. Kanno, T. Takada, O. Yamamoto, M. Takano, N. Nakayama, and Y. Bando. "Phase relation in the oxygen nonstoichiometric system, SrFeOx (2.5 ≤ x ≤ 3.0)." Journal of Solid State Chemistry 63, no. 2 (July 1986): 237–49. http://dx.doi.org/10.1016/0022-4596(86)90174-x.

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6

Bush, A. A., V. A. Sarin, D. G. Georgiev, and V. M. Cherepanov. "Synthesis, X-ray and neutron diffraction and Mössbauer studies of SrFeOx crystals." Crystallography Reports 45, no. 5 (September 2000): 734–38. http://dx.doi.org/10.1134/1.1312911.

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7

Galakhov, V. R., E. Z. Kurmaev, K. Kuepper, M. Neumann, J. A. McLeod, A. Moewes, I. A. Leonidov, and V. L. Kozhevnikov. "Valence Band Structure and X-ray Spectra of Oxygen-Deficient Ferrites SrFeOx." Journal of Physical Chemistry C 114, no. 11 (March 2, 2010): 5154–59. http://dx.doi.org/10.1021/jp909091s.

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8

Yang, Qian, Hai Jun Cho, Hyoungjeen Jeen, and Hiromichi Ohta. "Solid-state electrochemical redox control of the optoelectronic properties for SrFeOx thin films." Journal of Applied Physics 129, no. 21 (June 1, 2021): 215303. http://dx.doi.org/10.1063/5.0053939.

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9

Rao, J., Z. Fan, L. Hong, S. Cheng, Q. Huang, J. Zhao, X. Xiang, et al. "An electroforming-free, analog interface-type memristor based on a SrFeOx epitaxial heterojunction for neuromorphic computing." Materials Today Physics 18 (May 2021): 100392. http://dx.doi.org/10.1016/j.mtphys.2021.100392.

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10

Takano, M., T. Okita, N. Nakayama, Y. Bando, Y. Takeda, O. Yamamoto, and J. B. Goodenough. "Dependence of the structure and electronic state of SrFeOx (2.5 ≤ x ≤ 3) on composition and temperature." Journal of Solid State Chemistry 73, no. 1 (March 1988): 140–50. http://dx.doi.org/10.1016/0022-4596(88)90063-1.

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11

Majid, Abdul, Jim Tunney, Steve Argue, and Mike Post. "The Effect of Preparation Method and Calcination Temperature on the Crystallite Size and Surface Area of Perovskite-Type SrFeOx." Journal of Sol-Gel Science and Technology 32, no. 1-3 (December 2004): 323–26. http://dx.doi.org/10.1007/s10971-004-5810-8.

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12

Blakely, Colin K., Joshua D. Davis, Shaun R. Bruno, Shannon K. Kraemer, Mengze Zhu, Xianglin Ke, Wenli Bi, E. Ercan Alp, and Viktor V. Poltavets. "Multistep synthesis of the SrFeO2F perovskite oxyfluoride via the SrFeO2 infinite-layer intermediate." Journal of Fluorine Chemistry 159 (March 2014): 8–14. http://dx.doi.org/10.1016/j.jfluchem.2013.12.007.

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13

Sim, Jaeyong, Sang-Hyeok Kim, Jin-Yong Kim, Ki Bong Lee, Sung-Chan Nam, and Chan Young Park. "Enhanced Carbon Dioxide Decomposition Using Activated SrFeO3−δ." Catalysts 10, no. 11 (November 3, 2020): 1278. http://dx.doi.org/10.3390/catal10111278.

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Today, climate change caused by global warming has become a worldwide problem with increasing greenhouse gas (GHG) emissions. Carbon capture and storage technologies have been developed to capture carbon dioxide (CO2); however, CO2 storage and utilization technologies are relatively less developed. In this light, we have reported efficient CO2 decomposition results using a nonperovskite metal oxide, SrFeCo0.5Ox, in a continuous-flow system. In this study, we report enhanced efficiency, reliability under isothermal conditions, and catalytic reproducibility through cyclic tests using SrFeO3−δ. This ferrite needs an activation process, and 3.5 vol% H2/N2 was used in this experiment. Activated oxygen-deficient SrFeO3−δ can decompose CO2 into carbon monoxide (CO) and carbon (C). Although SrFeO3−δ is a well-known material in different fields, no studies have reported its use in CO2 decomposition applications. The efficiency of CO2 decomposition using SrFeO3−δ reached ≥90%, and decomposition (≥80%) lasted for approximately 170 min. We also describe isothermal and cyclic experimental data for realizing commercial applications. We expect that these results will contribute to the mitigation of GHG emissions.

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14

Katayama, T., A. Chikamatsu, Y. Hirose, R. Takagi, H. Kamisaka, T. Fukumura, and T. Hasegawa. "Topotactic fluorination of strontium iron oxide thin films using polyvinylidene fluoride." J. Mater. Chem. C 2, no. 27 (2014): 5350–56. http://dx.doi.org/10.1039/c4tc00558a.

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15

Седых, В. Д., О. Г. Рыбченко, Э. В. Суворов, А. И. Иванов, and В. И. Кулаков. "Кислородные вакансии и валентные состояния железа в соединениях SrFeO-=SUB=-3-delta-=/SUB=-." Физика твердого тела 62, no. 10 (2020): 1698. http://dx.doi.org/10.21883/ftt.2020.10.49924.096.

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The X-ray and Mossbauer studies of the Brownmillerite phase have been carried out in the given work and the well-known literature data on the single phase compounds with a perovskite structure in ferrite strontium SrFeO3-δ have been analyzed. It has been found out that all Fe valence states for any phase composition of ferrite strontium are determined by its local oxygen environment. It allows us to understand the behavior of Fe transition from one valence state to another when adding oxygen vacancies and to explain the Fe structural states in the SrFeO3-δ oxide including single and two-phase compositions. This approach is a more general case for description of the all known compounds and synthesized phase combinations in SrFeO3-δ and the formula considered in literature for the single-phase structures well agrees with it.

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16

Wang, Dashan, James J. Tunney, Xiaomei Du, Michael L. Post, and Raynald Gauvin. "Transmission electron microscopy investigation of interfacial reactions between SrFeO3 thin films and silicon substrates." Journal of Materials Research 22, no. 1 (January 2007): 76–88. http://dx.doi.org/10.1557/jmr.2007.0005.

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The SrFeO3/SiO2/Si thin film system has been studied using transmission electron microscopy (TEM). The thin films of SrFeO3 were grown by pulsed laser deposition onto silicon substrates with a SiO2 buffer layer at room temperature (RT) and 700 °C and subjected to annealing for various periods of time at temperature T = 700 °C. Transmission electron microscopy characterization showed that the microstructure of the film deposited at room temperature contained crystalline and amorphous layers. Silicon diffusion into SrFeO3 films occurred at the SiO2 interface for the samples deposited at 700 °C and for those films annealed at 700 °C. The silicon diffusion-induced interfacial reactions resulted in the phase transformations and the growth of complex crystalline and amorphous phases. The principal compositions of these phases were Sr(Fe,Si)12O19, SrOx and amorphous [Sr-Fe-O-Si].

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17

Liang, Chong, De An Yang, Jian Jing Song, and Ming Xia Xu. "Oxygen Sensitivity of SrFeO_3-δ Thin Films Prepared by Sol-Gel Method." Key Engineering Materials 280-283 (February 2007): 315–18. http://dx.doi.org/10.4028/www.scientific.net/kem.280-283.315.

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Sr(NO3)2, Fe(NO3)3 and citric acid (the mole ratio was 1:1:2) were mixed in water to form sol. Alumina substrate, which had been treated by ultrasonic cleaner, were dipped in the sol and pulled out, and the coating film was heated for 1h at 900oC. Through seventeen times treatment, SrFeO3-d thin film was coated on the alumina substrate. The remainder sol was dried and heated at 400oC, 800oC, 900oC for 2 h. The thin films and the powders were characterized by XRD. The morphologies of thin films were observed by SEM. The results showed that SrFeO3-δ was formed at 900oC on alumina substrate and the grain size was 100 ~ 200 nm. The oxygen sensitivity was measured in the temperature range of 377 ~ 577oC under different oxygen partial pressures. SrFeO3-δ thin film showed p-type conduction. The response time was less than 2 min when being exposed to a change from N2 to 0.466% O2 at 377oC.

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18

Седых, В. Д., О. Г. Рыбченко, А. Н. Некрасов, И. Е. Конева, and В. И. Кулаков. "Влияние содержания кислорода на локальное окружение атомов Fe в анион-дефицитном SrFeO-=SUB=-3-delta-=/SUB=-." Физика твердого тела 61, no. 6 (2019): 1162. http://dx.doi.org/10.21883/ftt.2019.06.47694.372.

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The structure features of polycrystalline anion-deficient ferrite strontium SrFeO3-δ have been investigated for different oxygen content by Mossbauer spectroscopy, X-ray diffraction analysis and scanning electron microscopy. Three structures with a different composition have been prepared depending on heat treatment conditions. Several non-equivalent Fe positions exist within each structure that correspond to different local oxygen environments the relation and distortion degree of which change depending on oxygen quantity. Based on the Mossbauer data obtained an oxygen content has been estimated for each structure. One more the model intermediate composition Sr16Fe16O45 of the SrFeO3-δ compound is proposed.

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19

Wu, Chunping, Yiran Zhang, Bang Xiao, Lin Yang, Anqi Jiao, Yinan Wang, Xuteng Zhao, and He Lin. "YSZ-Based Mixed Potential Type Sensors Utilizing Pd-doped SrFeO₃ Perovskite Sensing Electrode to Monitor Sulfur Dioxide Emission." Journal of The Electrochemical Society 169, no. 3 (March 1, 2022): 037508. http://dx.doi.org/10.1149/1945-7111/ac593c.

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Sulfur dioxide (SO2) is one of the key pollutants in the atmosphere that should be monitored in many combustion facilities. In this paper, YSZ-based mixed potential SO2 sensors were developed utilizing the perovskite-type SrFeO3 sensing electrode, and Pd doping was applied to enhance the sensing performance. It was found that the sensor utilizing the Pd0.05-SrFeO3 sensing electrode showed the highest sensitivity toward 1–30 ppm SO2 at 575 ° C , and exhibited a piecewise linear relationship between Δ V and the logarithm of SO2 concentrations in this concentration range. The significant enhancement of sensing performances by 5 at% Pd doping was mainly attributed to the increasing of electrochemical catalytic activity of the anodic reaction. After the sensing performance test in the temperature range between 525 ° C –625 ° C , 575 ° C was selected as the optimum operating temperature. The sensing performances of the developed Pd0.05-SrFeO3 sensor were further evaluated at 575 ° C , exhibiting good selectivity to CO, CO2, NO, and NO2 interference and good long-term stability. In addition, the fluctuation of oxygen concentration can be corrected by the Butler-Volmer equation following the mixed potential theory.

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20

Nikolenko, Polina I., Timur R. Nizamov, Igor G. Bordyuzhin, Maxim A. Abakumov, Yulia A. Baranova, Alexander D. Kovalev, and Igor V. Shchetinin. "Structure and Magnetic Properties of SrFe12−xInxO19 Compounds for Magnetic Hyperthermia Applications." Materials 16, no. 1 (December 30, 2022): 347. http://dx.doi.org/10.3390/ma16010347.

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In this work, complex studies of the structure and magnetic properties of SrFe12−xInxO19 powders obtained by the mechanochemical and citrate methods were carried out. The solubility of In in strontium hexaferrite SrFe₁₂O₁₉ at 1200 °C was determined. The structure and properties of the powders were studied using X-ray diffraction analysis, Mössbauer spectroscopy and scanning electron microscopy. Measurements of magnetic properties in magnetic fields up to 1600 kA/m were also performed. Additionally, the hyperthermia effect was investigated. The possibility of controlling the coercivity of the samples in the range from 188.9 kA/m to 22.3 kA/m and saturation magnetization from 63.5 A·m2/kg to 44.2 A·m2/kg with an increase in the degree of In doping was also demonstrated. Investigation of the magnetic hyperthermia of the samples was carried out by temperature measurement with an IR camera when they were introduced into alternating magnetic fields of various frequencies (144, 261 and 508 kHz) and amplitudes (between 11.96 and 19.94 kA/m). According to the study result, there was detected the heating of the SrFe12−xInxO19 sample (x = 1.7). The highest values of magnetic hyperthermia of the sample were observed in a 19.94 kA/m magnetic field and a frequency of 261 kHz. At a concentration of 56.67 g/L, the sample was heated from 23 to 41 °C within 2 min. The parameters SLP (specific loss power) and ILP (intrinsic loss power) were calculated.

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21

Nguyen, Nhu Pailes, Tyler P. Farr, H. Evan Bush, Andrea Ambrosini, and Peter G. Loutzenhiser. "Air separation via two-step solar thermochemical cycles based on SrFeO3−δ and (Ba,La)0.15Sr0.85FeO3−δ perovskite reduction/oxidation reactions to produce N2: rate limiting mechanism(s) determination." Physical Chemistry Chemical Physics 23, no. 35 (2021): 19280–88. http://dx.doi.org/10.1039/d1cp03303d.

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22

Gurskii, A. L., N. A. Kalanda, M. V. Yarmolich, I. A. Bobrikov, S. V. Sumnikov, and A. V. Petrov. "PHASE TRANSFORMATIONS DURING CRYSTALLIZATION OF A SOLID SOLUTION OF STRONTIUM-SUBSTITUTED DOUBLE PEROVSKITE." Doklady BGUIR, no. 7-8 (December 29, 2019): 73–80. http://dx.doi.org/10.35596/1729-7648-2019-126-8-73-80.

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The kinetics of phase contents modification in the process of SrBaFeMoO6–δ crystallization from a stoichiometric mixture of SrCO3 + BaCO3 + 0,5Fe2O3 + MoO3 simple oxides using the solid phase method has been investigated. In the temperature region of 300–1200°С, a number of endotermic effects have been detected. Herewith, the first one (with maximum around 552°С) and the third one (with maximum around 743°С) are accompanying by the significant decrease of the mass of specimen. In the temperature range of 946–1200°С, the mass change of specimen is practically not observable, while the thermal effect is still present, and the specimen remains not single-phase one. This indicates the difficulty of the flow of solid phase reactions with the formation of solid solution of barium-strontium ferromolybdate. During analysis of the change of the phase composition consisting of a mixture of initial reagents of stoichiometric relation SrCO3 + BaCO3 + 0,5Fe2O3 + MoO3, it has been observed that with increasing temperature, complex compounds BaMoO4, SrFeO3 appear almost simultaneously, then SrBaFeMoO6–δ appears consequently. Thus, the compounds BaMoO4 и SrFeO3, are structure forming for the solid solution of barium-strontium ferromolybdate. With further temperature increase up to 770°С the formation of new compound ВаFeO3 with disappearing SrFeO3 was detected. In this case, the amount of double perovskite increases faster than that of barium molybdate. The main accompanying compounds at the crystallization of the SrBaFeMoO6–δ double perovskite solid solution are BaMoO4 and SrFeO3. It was established that at the initial stage of the interaction, the resulting solid solution of barium-strontium ferromolybdate is enriched with iron and its composition changes during the reaction in the direction of an increase of the molybdenum content, as in the case of other precursor combinations.

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23

Chen, Sha, Hongwei Cheng, Yanbo Liu, Xiaolu Xiong, Qiangcao Sun, Xionggang Lu, and Shenggang Li. "First-principles studies of oxygen ion migration behavior for different valence B-site ion doped SrFeO_3−δ ceramic membranes." Physical Chemistry Chemical Physics 23, no. 48 (2021): 27266–72. http://dx.doi.org/10.1039/d1cp03845a.

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24

Zhong, Yu-Jie, and Chong-Der Hu. "Spin Waves in SrFeO3." Journal of the Physical Society of Japan 82, no. 1 (January 15, 2013): 014704. http://dx.doi.org/10.7566/jpsj.82.014704.

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25

Thiemig, Vera, Rodrigo Rojas, Mauricio Zambrano-Bigiarini, Vincenzo Levizzani, and Ad De Roo. "Validation of Satellite-Based Precipitation Products over Sparsely Gauged African River Basins." Journal of Hydrometeorology 13, no. 6 (December 1, 2012): 1760–83. http://dx.doi.org/10.1175/jhm-d-12-032.1.

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Abstract Six satellite-based rainfall estimates (SRFE)—namely, Climate Prediction Center (CPC) morphing technique (CMORPH), the Rainfall Estimation Algorithm, version 2 (RFE2.0), Tropical Rainfall Measuring Mission (TRMM) 3B42, Goddard profiling algorithm, version 6 (GPROF 6.0), Precipitation Estimation from Remotely Sensed Information using Artificial Neural Networks (PERSIANN), Global Satellite Mapping of Precipitation moving vector with Kalman filter (GSMap MVK), and one reanalysis product [the interim ECMWF Re-Analysis (ERA-Interim)]—were validated against 205 rain gauge stations over four African river basins (Zambezi, Volta, Juba–Shabelle, and Baro–Akobo). Validation focused on rainfall characteristics relevant to hydrological applications, such as annual catchment totals, spatial distribution patterns, seasonality, number of rainy days per year, and timing and volume of heavy rainfall events. Validation was done at three spatially aggregated levels: point-to-pixel, subcatchment, and river basin for the period 2003–06. Performance of satellite-based rainfall estimation (SRFE) was assessed using standard statistical methods and visual inspection. SRFE showed 1) accuracy in reproducing precipitation on a monthly basis during the dry season, 2) an ability to replicate bimodal precipitation patterns, 3) superior performance over the tropical wet and dry zone than over semiarid or mountainous regions, 4) increasing uncertainty in the estimation of higher-end percentiles of daily precipitation, 5) low accuracy in detecting heavy rainfall events over semiarid areas, 6) general underestimation of heavy rainfall events, and 7) overestimation of number of rainy days in the tropics. In respect to SRFE performance, GPROF 6.0 and GSMaP-MKV were the least accurate, and RFE 2.0 and TRMM 3B42 were the most accurate. These results allow discrimination between the available products and the reduction of potential errors caused by selecting a product that is not suitable for particular morphoclimatic conditions. For hydrometeorological applications, results support the use of a performance-based merged product that combines the strength of multiple SRFEs.

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26

Wang, Xijun, Yunfei Gao, Emily Krzystowczyk, Sherafghan Iftikhar, Jian Dou, Runxia Cai, Haiying Wang, Chongyan Ruan, Sheng Ye, and Fanxing Li. "High-throughput oxygen chemical potential engineering of perovskite oxides for chemical looping applications." Energy & Environmental Science 15, no. 4 (2022): 1512–28. http://dx.doi.org/10.1039/d1ee02889h.

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Integrating DFT, machine learning and experimental verifications, a high-throughput screening scheme is performed to rationally engineer the redox properties of SrFeO3−δ based perovskites for chemical looping applications.

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27

Alaydrus, Musa, Ikutaro Hamada, and Yoshitada Morikawa. "Mechanistic insight into oxygen vacancy migration in SrFeO3−δ from DFT+U simulations." Physical Chemistry Chemical Physics 23, no. 34 (2021): 18628–39. http://dx.doi.org/10.1039/d1cp02452c.

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DFT+U was utilized to address the relationship between oxygen ion diffusion and the local geometric and magnetic structures in various polymorphic SrFeO3–δ structures at different oxygen vacancy concentrations.

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28

Xu, Kun, Youdi Gu, Cheng Song, Xiaoyan Zhong, and Jing Zhu. "Atomic insight into spin, charge and lattice modulations at SrFeO3−x/SrTiO3 interfaces." Nanoscale 13, no. 12 (2021): 6066–75. http://dx.doi.org/10.1039/d0nr07697j.

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29

Krzystowczyk, Emily, Xijun Wang, Jian Dou, Vasudev Haribal, and Fanxing Li. "Substituted SrFeO3 as robust oxygen sorbents for thermochemical air separation: correlating redox performance with compositional and structural properties." Physical Chemistry Chemical Physics 22, no. 16 (2020): 8924–32. http://dx.doi.org/10.1039/d0cp00275e.

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30

Heifets, Eugene, Eugene A. Kotomin, Alexander A. Bagaturyants, and Joachim Maier. "Thermodynamic stability of non-stoichiometric SrFeO3−δ: a hybrid DFT study." Physical Chemistry Chemical Physics 21, no. 7 (2019): 3918–31. http://dx.doi.org/10.1039/c8cp07117a.

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31

Bulfin, B., J. Vieten, S. Richter, J. M. Naik, G. R. Patzke, M. Roeb, C. Sattler, and A. Steinfeld. "Isothermal relaxation kinetics for the reduction and oxidation of SrFeO3 based perovskites." Physical Chemistry Chemical Physics 22, no. 4 (2020): 2466–74. http://dx.doi.org/10.1039/c9cp05771d.

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32

Yamamoto, Kohei, Tomoyuki Tsuyama, Suguru Ito, Kou Takubo, Iwao Matsuda, Niko Pontius, Christian Schüßler-Langeheine, et al. "Photoinduced transient states of antiferromagnetic orderings in La_1/3Sr_2/3FeO₃ and SrFeO_3−δ thin films observed through time-resolved resonant soft x-ray scattering." New Journal of Physics 24, no. 4 (April 1, 2022): 043012. http://dx.doi.org/10.1088/1367-2630/ac5f31.

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Abstract The relationship between the magnetic interaction and photoinduced dynamics in antiferromagnetic perovskites is investigated in this study. In La1/3Sr2/3FeO3 thin films, commensurate spin ordering is accompanied by charge disproportionation, whereas SrFeO3−δ thin films show incommensurate helical antiferromagnetic spin ordering due to increased ferromagnetic coupling compared to La1/3Sr2/3FeO3. To understand the photoinduced spin dynamics in these materials, we investigate the spin ordering through time-resolved resonant soft x-ray scattering. In La1/3Sr2/3FeO3, ultrafast quenching of the magnetic ordering within 130 fs through a nonthermal process is observed, triggered by charge transfer between the Fe atoms. We compare this to the photoinduced dynamics of the helical magnetic ordering of SrFeO3−δ . We find that the change in the magnetic coupling through optically induced charge transfer can offer an even more efficient channel for spin-order manipulation.

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33

Chikamatsu, Akira, Yusuke Suzuki, Takahiro Maruyama, Tomoya Onozuka, Tsukasa Katayama, Daisuke Ogawa, and Tetsuya Hasegawa. "Selective fluorination of perovskite iron oxide/ruthenium oxide heterostructures via a topotactic reaction." Chemical Communications 55, no. 17 (2019): 2437–40. http://dx.doi.org/10.1039/c8cc09443h.

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34

Kleveland, Kjersti, Andrew Wereszczak, Timothy P. Kirkland, Mari-Ann Einarsrud, and Tor Grande. "Compressive Creep Performance of SrFeO3." Journal of the American Ceramic Society 84, no. 8 (December 20, 2004): 1822–26. http://dx.doi.org/10.1111/j.1151-2916.2001.tb00921.x.

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35

Matsubayashi, Yasuhito, Junichi Nomoto, Iwao Yamaguchi, and Tetsuo Tsuchiya. "Control of the oxygen deficiency and work function of SrFeO3−δ thin films by excimer laser-assisted metal organic decomposition." CrystEngComm 22, no. 28 (2020): 4685–91. http://dx.doi.org/10.1039/d0ce00442a.

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36

dos Santos-Gómez, L., J. M. Porras-Vázquez, E. R. Losilla, and D. Marrero-López. "Ti-doped SrFeO3 nanostructured electrodes for symmetric solid oxide fuel cells." RSC Advances 5, no. 130 (2015): 107889–95. http://dx.doi.org/10.1039/c5ra23771h.

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37

Luongo, Giancarlo, Felix Donat, and Christoph R. Müller. "Structural and thermodynamic study of Ca A- or Co B-site substituted SrFeO3−δ perovskites for low temperature chemical looping applications." Physical Chemistry Chemical Physics 22, no. 17 (2020): 9272–82. http://dx.doi.org/10.1039/d0cp01049a.

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38

Cui, Wei, Liang Yang, Ismat Ullah, Keda Yu, Zhigang Zhao, Xinfeng Gao, Tao Liu, et al. "Biomimetic porous scaffolds containing decellularized small intestinal submucosa and Sr²⁺/Fe³⁺ co-doped hydroxyapatite accelerate angiogenesis/osteogenesis for bone regeneration." Biomedical Materials 17, no. 2 (February 2, 2022): 025008. http://dx.doi.org/10.1088/1748-605x/ac4b45.

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Abstract The design of bone scaffolds is predominately aimed to well reproduce the natural bony environment by imitating the architecture/composition of host bone. Such biomimetic biomaterials are gaining increasing attention and acknowledged quite promising for bone tissue engineering. Herein, novel biomimetic bone scaffolds containing decellularized small intestinal submucosa matrix (SIS-ECM) and Sr2+/Fe3+ co-doped hydroxyapatite (SrFeHA) are fabricated for the first time by the sophisticated self-assembled mineralization procedure, followed by cross-linking and lyophilization post-treatments. The results indicate the constructed SIS/SrFeHA scaffolds are characterized by highly porous structures, rough microsurface and improved mechanical strength, as well as efficient releasing of bioactive Sr2+/Fe3+ and ECM components. These favorable physico-chemical properties endow SIS/SrFeHA scaffolds with an architectural/componential biomimetic bony environment which appears to be highly beneficial for inducing angiogenesis/osteogenesis both in vitro and in vivo. In particular, the cellular functionality and bioactivity of endotheliocytes/osteoblasts are significantly enhanced by SIS/SrFeHA scaffolds, and the cranial defects model further verifies the potent ability of SIS/SrFeHA to accelerate in vivo vascularization and bone regeneration following implantation. In this view these results highlight the considerable angiogenesis/osteogenesis potential of biomimetic porous SIS/SrFeHA scaffolds for inducing bone regeneration and thus may afford a new promising alternative for bone tissue engineering.

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39

Yao, Shukai, Pilsun Yoo, and Peilin Liao. "A computational study of hydrogen doping induced metal-to-insulator transition in CaFeO3, SrFeO3, BaFeO3 and SmMnO3." Physical Chemistry Chemical Physics 21, no. 45 (2019): 25397–405. http://dx.doi.org/10.1039/c9cp04669k.

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First principles density functional theory calculations were performed to identify transition metal perovskites CaFeO₃, SrFeO₃, BaFeO₃ and SmMnO₃ as promising candidates with large band gap opening upon hydrogen doping.

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40

Zhao, Jiali, Kaihui Chen, Shi-En Li, Qinghua Zhang, Jia-Ou Wang, Er-Jia Guo, Haijie Qian, et al. "Electronic-structure evolution of SrFeO_3–x during topotactic phase transformation." Journal of Physics: Condensed Matter 34, no. 6 (November 22, 2021): 064001. http://dx.doi.org/10.1088/1361-648x/ac36fd.

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Abstract Oxygen-vacancy-induced topotactic phase transformation between the ABO2.5 brownmillerite structure and the ABO3 perovskite structure attracts ever-increasing attention due to the perspective applications in catalysis, clean energy field, and memristors. However, a detailed investigation of the electronic-structure evolution during the topotactic phase transformation for understanding the underlying mechanism is highly desired. In this work, multiple analytical methods were used to explore evolution of the electronic structure of SrFeO3−x thin films during the topotactic phase transformation. The results indicate that the increase in oxygen content induces a new unoccupied state of O 2p character near the Fermi energy, inducing the insulator-to-metal transition. More importantly, the hole states are more likely constrained to the dx 2–y 2 orbital than to the d3z 2–r 2 orbital. Our results reveal an unambiguous evolution of the electronic structure of SrFeO3–x films during topotactic phase transformation, which is crucial not only for fundamental understanding but also for perspective applications such as solid-state oxide fuel cells, catalysts, and memristor devices.

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Manimuthu, P., and C. Venkateswaran. "Evidence of ferroelectricity in SrFeO3−δ." Journal of Physics D: Applied Physics 45, no. 1 (December 12, 2011): 015303. http://dx.doi.org/10.1088/0022-3727/45/1/015303.

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Schmidt, M. "Mechanically induced oxidation of SrFeO3−δ." Materials Research Bulletin 35, no. 2 (January 2000): 169–75. http://dx.doi.org/10.1016/s0025-5408(00)00209-9.

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Berry, Frank J., Xiaolin Ren, Richard Heap, Peter Slater, and Michael F. Thomas. "Fluorination of perovskite-related SrFeO3−δ." Solid State Communications 134, no. 9 (June 2005): 621–24. http://dx.doi.org/10.1016/j.ssc.2005.03.005.

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YANG, Jun, Runsheng LI, Xiaoci LI, Yulin LONG, Junyi ZHOU, and Yuanming ZHANG. "Molten salt synthesis of SrFeO3 nanocrystals." Journal of the Ceramic Society of Japan 119, no. 1394 (2011): 736–39. http://dx.doi.org/10.2109/jcersj2.119.736.

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Darwish, Esraa, Moufida Mansouri, Duygu Yilmaz, and Henrik Leion. "Effect of Mn and Cu Substitution on the SrFeO3 Perovskite for Potential Thermochemical Energy Storage Applications." Processes 9, no. 10 (October 13, 2021): 1817. http://dx.doi.org/10.3390/pr9101817.

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Perovskites are well-known oxides for thermochemical energy storage applications (TCES) since they show a great potential for spontaneous O2 release due to their non-stoichiometry. Transition-metal-based perovskites are particularly promising candidates for TCES owing to their different oxidation states. It is important to test the thermal behavior of the perovskites for TCES applications; however, the amount of sample that can be used in thermal analyses is limited. The use of redox cycles in fluidized bed tests can offer a more realistic approach, since a larger amount of sample can be used to test the cyclic behavior of the perovskites. In this study, the oxygen release/consumption behavior of Mn- or Cu-substituted SrFeO3 (SrFe0.5M0.5O3; M: Mn or Cu) under redox cycling was investigated via thermal analysis and fluidized bed tests. The reaction enthalpies of the perovskites were also calculated via differential scanning calorimetry (DSC). Cu substitution in SrFeO3 increased the performance significantly for both cyclic stability and oxygen release/uptake capacity. Mn substitution also increased the cyclic stability; however, the presence of Mn as a substitute for Fe did not improve the oxygen release/uptake performance of the perovskite.

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Назаренко, А. В., Г. В. Валов, and А. В. Павленко. "ЗЕРЕННОЕ СТРОЕНИЕ МУЛЬТИФЕРРОИКА SrFeWO, "Наука юга России"." Science in the South of Russia, no. 1 (2022): 12–15. http://dx.doi.org/10.7868/s25000640220102.

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Изготовлена керамика высокотемпературного мультиферроика SrFeWO методом твердофазных реакций. По результатам рентгеноструктурного анализа выявлено, что образец является однофазным, примеси отсутствуют. С использованием оптической и электронной микроскопии проведен анализ зеренной структуры SrFeWO. Несмотря на широкий интервал размеров зерен, все они идентичной формы, что подтверждает отсутствие примесных фаз. Границы зерен чистые и не имеют никаких включений. Внутренняя структура самих зерен однородна, практически гладкая.

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Manimuthu, P., R. Murugaraj, and C. Venkateswaran. "Non-universal dielectric relaxation in SrFeO3−δ." Physics Letters A 378, no. 36 (July 2014): 2725–28. http://dx.doi.org/10.1016/j.physleta.2014.07.035.

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Wiβmann, S. "Localization of electrons in nonstoichiometric SrFeO3 − Δ." Solid State Ionics 85, no. 1-4 (May 1996): 279–83. http://dx.doi.org/10.1016/0167-2738(96)00071-9.

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Shoushtari, M. Zargar, S. E. Mousavi Ghahfarokhi, and F. Ranjbar. "Synthesis and Magnetic Properties of SrFe_12-XCo_xO₁₉ (x= 0- 2) Hexaferrite Nanoparticles." Advanced Materials Research 622-623 (December 2012): 925–29. http://dx.doi.org/10.4028/www.scientific.net/amr.622-623.925.

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In this paper, a batch of M- type strontium hexaferrite samples with nominal composition of SrFe12-xCoxO19(where x= 0- 2), have been synthesized via sol- gel method. In the synthesis of samples, first a precursor gel was prepared, and then dry- gel was calcined at 1000°C for 2 hours to obtain the nano- SrFe12-xCoxO19. The XRD results revealed that for SrFe12-xCoxO19 samples with x≤0.5, all of them have single- phase hexaferrite structure and also this data suggests that the F 3+ ions are substituted by Co2+ ions in the crystallography sites of the SrFe12-xCoxO19, but for the samples with x>0.5, the second phase of CoFe2O4 is appeared and suggests that the Co2+ ions also make a distinct phase in the samples. The magnetic properties, such as saturation magnetization (Ms), magnetic remanence (Mr), magnetic coercivity (Hc), squareness ratio (Mr/Ms), crystalline anisotropy field (Ha), energy product [(BH)max] and the susceptibility χ as the derivative of M with respect to H of the upper branch of the hysteresis loop were discussed by measurements of M-H curves with vibrating sample magnetometer (VSM). The magnetic measurements revealed that the coercively (Hc) values of all the samples decrease with increasing dopant contents.

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Poudel, T. P., D. Guragain, J. Mohapatra, J. P. Liu, and S. R. Mishra. "Novel Molten Salt Assisted Autocombustion Method for the Synthesis of Aluminum-Doped SrFe12−xAlxO19 Hexaferrite Nanoparticles." Journal of Nanoscience and Nanotechnology 20, no. 12 (December 1, 2020): 7735–42. http://dx.doi.org/10.1166/jnn.2020.18888.

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The study presents a novel molten salt assisted autocombustion synthesis of SrFe12−xAlxO19 particles. The extrinsic magnetic properties such as coercivity and the remanence of sintered M-type ferrites are highly dependent on the microstructure viz. morphology and size, of the ferrite particles. The control of the microstructures of ferrite particles is usually achieved via control nucleation and grain growth process. In this study, NaCl salt was used to control the crystal shape and size of Al3+ doped SrFe12−xAlxO19 particles. The presented novel method couples advantage of deriving homogenized particles via auctocombustion first and later sintering in the presence of NaCl salt. Highly dispersed, homogeneous, and hexagonal shaped SrFe12−xAlxO19 ferrite particles were achieved with this method. The particles derived via the molten salt assisted method presented a high coercivity and squareness ratio (>0.5) as compared to that obtained via autocombustion method only.

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Journal articles on the topic 'SrFeOx'

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