| 1 | Realizing n-type CdSb with promising thermoelectric performance显示文摘Realizing high performance in both n-type and p-type materials is essential for designing efficient ther-moelectric devices.However,the doping bottleneck is often encountered,i.e.,only one type of conduction can be realized.As one example,p-type CdSb with high thermoelectric performance has been discovered for several decades,while its n-type counterpart has rarely been reported.In this work,the calculated band structure of CdSb demonstrates that the valley degeneracy is as large as ten for the conduction band,and it is only two for the valence band.Therefore,the n-type CdSb can potentially realize an ex-ceptional thermoelectric performance.Experimentally,the n-type conduction has been successfully real-ized by tuning the stoichiometry of CdSb.By further doping indium at the Cd site,an improved room-temperature electron concentration has been achieved.Band modeling predicts an optimal electron con-centration of∼2.0×1019 cm−3,which is higher than the current experimental values.Therefore,future optimization of the n-type CdSb should mainly focus on identifying practical approaches to optimize the electron concentration. | Peng Zhao Honghao Yao Shizhen Zhi Xiaojing Ma Zuoxu Wu Yijie Liu Xinyu Wang Li Yin Zongwei Zhang Shuaihang Hou Xiaodong Wang Siliang Chen Chen Chen Xi Lin Haoliang Liu Xingjun Liu Feng Cao Qian Zhang Jun Mao | 2023 | Journal of Materials Science & Technology2023，，13： | 0 |
| 2 | Revealing the Defect-Dominated Electron Scattering in Mg_(3)Sb_(2)-Based Thermoelectric Materials显示文摘The thermoelectric parameters are essentially governed by electron and phonon transport.Since the carrier scattering mechanism plays a decisive role in electron transport,it is of great significance for the electrical properties of thermoelectric materials.As a typical example,the defect-dominated carrier scattering mechanism can significantly impact the room-temperature electron mobility of n-type Mg_(3)Sb_(2)-based materials.However,the origin of such a defect scattering mechanism is still controversial.Herein,the existence of the Mg vacancies and Mg interstitials has been identified by synchrotron powder X-ray diffraction.The relationship among the point defects,chemical compositions,and synthesis conditions in Mg_(3)Sb_(2)-based materials has been revealed.By further introducing the point defects without affecting the grain size via neutron irradiation,the thermally activated electrical conductivity can be reproduced.Our results demonstrate that the point defects scattering of electrons is important in the n-type Mg_(3)Sb_(2)-based materials. | Jucai Jia Yan Zhou Xiaoxi Chen Wenhua Xue Hulei Yu Jing Li Shizhen Zhi Chen Chen Jian Wang Shuaihang Hou Xingjun Liu Yumei Wang Feng Cao Yue Chen Jun Mao Qian Zhang | 2023 | Research2023，，1： | 0 |
| 3 | Theory, Technology and Practice of Unconventional Petroleum Geology显示文摘0 INTRODUCTION The breakthroughs in unconventional petroleum have a great impact on world petroleum industry and innovation in petroleum geology(Dou et al,2022;Jia,2017;Zou et al.,2015b,2014a;Yerkin,2012;Pollastro,2007;Schmoker,1995).The exploration and development evolution from conventional petroleum to unconventional petroleum and more and more frequent industrial activities of exploring petroleum inside sources kitchen have deepened theoretical understanding of unconventional petroleum geology and promoted technical research and development(Jia et al.,2021,2017;Jin et al.,2021;Zhao W Z et al.,2020;Ma Y S et al.,2018,2012;Zou et al.,2018b,2016,2009;Dai et al.,2012).We have introduced and extended the theory of continuous hydrocarbon accumulation since 2008 and published several papers/books(in Chinese and English)with respect to unconventional petroleum geology since 2009,basically forming the theoretical framework for this discipline(Yang et al.,2022a,2021a,2019a,,2015a;Zou et al.,2019c,2017b,2014a,,2013a).In this paper,we present the background of unconventional petroleum geology,review the latest theoretical and technological progress in unconventional petroleum geology,introduce relevant thinking and practices in China,and explore the pathway of unconventional petroleum revolution and multi-energy coordinated development in super energy basins,hopefully to promote the unconventional petroleum geology and industry development. | Caineng Zou Zhi Yang Guosheng Zhang Rukai Zhu Shizhen Tao Xuanjun Yuan Lianhua Hou Dazhong Dong Qiulin Guo Yan Song Qiquan Ran Zhen Qiu Songtao Wu Feng Ma Bin Bai Lan Wang Bo Xiong Songqi Pan Hanlin Liu Xiaoni Wang | 2023 | Journal of Earth Science2023，34，4： | 0 |
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