Effects of high-pressure high-temperature treatment on the thermoelectric properties of PbTe
Effects of high-pressure high-temperature treatment on the thermoelectric properties of PbTe
复制标题
DOI：
10.1016/j.jallcom.2007.05.072
复制
发表时间：
2008-07
影响因子：
6.2
通讯作者：
M. McGuire;Abds-sami Malik;F. Disalvo
中科院分区：
文献类型：
--
作者：
M. McGuire;Abds-sami Malik;F. Disalvo
本文报道了在6.5GPa和900°C附近高压高温（HPHT）处理引起的名义上未掺杂的化学计量比PbTe的热电性质的变化。电阻率、热电势和热导率的比较表明，载流子浓度和晶格缺陷密度通过HPHT处理降低。在中间温度（500-600°C）下退火处理的样品逆转了变化。这些观察结果与Pb空位被施加的压力“挤出”，随后通过退火重新引入是一致的。
Changes in the thermoelectric properties of nominally undoped stoichiometric PbTe caused by high-pressure high-temperature (HPHT) treatment near 6.5GPa and 900°C are reported. Comparison of the electrical resistivity, thermopower, and thermal conductivity suggest that the carrier concentration and lattice defect density are decreased by HPHT treatment. Annealing the treated samples at intermediate temperatures (500–600°C) reversed the changes. These observations are consistent with Pb vacancies being “squeezed out” by the applied pressure, and subsequently reintroduced by annealing.