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Your search keyword '"Jin, Changqing"' showing total 13 results
Start Over Author "Jin, Changqing" Journal scientific reports
13 results on '"Jin, Changqing"'

2. Pressure-induced reversal between thermal contraction and expansion in ferroelectric PbTiO3.

Author

Zhu, Jinlong, Zhang, Jianzhong, Xu, Hongwu, Vogel, Sven C, Jin, Changqing, Frantti, Johannes, and Zhao, Yusheng

Abstract

Materials with zero/near zero thermal expansion coefficients are technologically important for applications in thermal management and engineering. To date, this class of materials can only be produced by chemical routes, either by changing chemical compositions or by composting materials with positive and negative thermal expansion. Here, we report for the first time a physical route to achieve near zero thermal expansion through application of pressure. In the stability field of tetragonal PbTiO3 we observed pressure-induced reversals between thermal contraction and expansion between ambient pressure and 0.9 GPa. This hybrid behavior leads to a mathematically infinite number of crossover points in the pressure-volume-temperature space and near-zero thermal expansion coefficients comparable to or even smaller than those attained by chemical routes. The observed pressures for this unusual phenomenon are within a small range of 0.1-0.9 GPa, potentially feasible for designing stress-engineered materials, such as thin films and nano-crystals, for thermal management applications.

Published
2014

4. Magnetic moment evolution and spin freezing in doped BaFe2As2

Author

Pelliciari, Jonathan, primary, Huang, Yaobo, additional, Ishii, Kenji, additional, Zhang, Chenglin, additional, Dai, Pengcheng, additional, Chen, Gen Fu, additional, Xing, Lingyi, additional, Wang, Xiancheng, additional, Jin, Changqing, additional, Ding, Hong, additional, Werner, Philipp, additional, and Schmitt, Thorsten, additional

Published
2017
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5. New Fluoride-arsenide Diluted Magnetic Semiconductor (Ba,K)F(Zn,Mn)As with Independent Spin and Charge Doping

Author

Chen, Bijuan, primary, Deng, Zheng, additional, Li, Wenmin, additional, Gao, Moran, additional, Liu, Qingqing, additional, Gu, C. Z., additional, Hu, F. X., additional, Shen, B. G., additional, Frandsen, Benjamin, additional, Cheung, Sky, additional, Lian, Liu, additional, Uemura, Yasutomo J., additional, Ding, Cui, additional, Guo, Shengli, additional, Ning, Fanlong, additional, Munsie, Timothy J. S., additional, Wilson, Murray Neff, additional, Cai, Yipeng, additional, Luke, Graeme, additional, Guguchia, Zurab, additional, Yonezawa, Shingo, additional, Li, Zhi, additional, and Jin, Changqing, additional

Published
2016
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8. High Pressure Phase-Transformation Induced Texture Evolution and Strengthening in Zirconium Metal: Experiment and Modeling

Author

Yu, Xiaohui, primary, Zhang, Ruifeng, additional, Weldon, David, additional, Vogel, Sven C., additional, Zhang, Jianzhong, additional, Brown, Donald W., additional, Wang, Yanbin, additional, Reiche, Helmut M., additional, Wang, Shanmin, additional, Du, Shiyu, additional, Jin, Changqing, additional, and Zhao, Yusheng, additional

Published
2015
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12. Pressure-induced spin transition and site-selective metallization in CoCl2.

Author

Barreda-Argüeso, Jose A., Nataf, Lucie, Aguado, Fernando, Hernández, Ignacio, González, Jesús, Otero-de-la-Roza, Alberto, Luaña, Víctor, Jia, Yating, Jin, Changqing, Kim, Bongjae, Kim, Kyoo, Min, Byung I., Heribert, Wilhem, Jephcoat, Andrew P., and Rodríguez, Fernando

Abstract

The interplay between spin states and metallization in compressed CoCl2 is investigated by combining diffraction, resistivity and spectroscopy techniques under high-pressure conditions and ab-initio calculations. A pressure-induced metallization along with a Co2+ high-spin (S = 3/2) to low-spin (S = 1/2) crossover transition is observed at high pressure near 70 GPa. This metallization process, which is associated with the p-d charge-transfer band gap closure, maintains the localization of 3d electrons around Co2+, demonstrating that metallization and localized Co2+ -3d low-spin magnetism can coexist prior to the full 3d-electron delocalization (Mott-Hubbard d-d breakdown) at pressures greater than 180 GPa. [ABSTRACT FROM AUTHOR]

Published
2019
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