Multiple phase transitions and structural oscillations in thermoelectric Cu2S at elevating temperatures

Multiple phase transitions and structural oscillations in thermoelectric Cu2S at elevating temperatures
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高温下热电 Cu2S 的多重相变和结构振荡

DOI:
10.1016/j.ceramint.2018.04.127
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发表时间:
2018-08
影响因子:
5.2
通讯作者:
Lidong Chen
Lidong Chen
中科院分区:
材料科学1区
文献类型:
--
作者:
Jialin Duan;Chenxi Zhu;Mengjia Guan;Ping Lu;Ying He;Zhengqian Fu;Linlin Zhang;Fangfang Xu;Xun Shi;Lidong Chen

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高性能热电 Cu2S 的固有超低晶格热导率 (κL) 可能源于其多种形式的复杂晶体结构,而在接近六方高辉铜矿相变的升高温度下观察到的 κL 进一步急剧下降令人相当感兴趣。在这项工作中,通过加热或电子辐照进行了深入的原位透射电子显微镜研究,以分析 Cu2S 的结构演化。在 Cu2S 中观察到多种包括新相结构。随着温度的升高,发生了剧烈的结构变化,包括不同相之间的相变、中间相的形成、晶体取向的转换和反相变,这表明具有高温度敏感性的多种形式的Cu排序。这种巨大的结构演化以及相界的形成和运动被认为会强烈散射声子。
The intrinsic ultra-low lattice thermal conductivity (κL) of high performance thermoelectric Cu2S may arise from its multiform complex crystal structures while the further sharp drop ofκLobserved at elevating temperatures close to the phase transition to hexagonal high-chalcocite is of considerable interest. In this work, in-depth in-situ transmission electron microscopy investigations have been performed by either heating or electron irradiation to analyze the structural evolution of Cu2S. Multiple including new phase structures have been observed in Cu2S. Upon increasing the temperature, drastic structural changes took place including phase transition among different phases, formation of an intermediate phase, switching of crystal orientation and inverse phase transitions, which indicate multiple forms of Cu ordering with high temperature-sensitivity. Such tremendous structural evolution along with formation and movement of phase boundaries are believed to strongly scatter the phonons.
DOI: 10.1002/pssa.2210670138
发表时间: 1981-09
期刊: Physica Status Solidi (a)
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