Abstract
P –type thermoelectric Bi 0,5 Sb 1,5 Te 3 powders were obtained by the melt spinning technique (extremely rapid quenching from the liquid state) and their structural and dimensional characteristics were characterized. The crystallographic group and the lattice parameters of the powders correspond to those for Bi 0,5 Sb 1,5 Te 3 crystallized in equilibrium conditions which suggests the identity of the crystal structure. The powders were compacted by vacuum hot pressing and spark plasma sintering. We found that the partial axial texture [001] directed along the axis of pressure application could be formed during the compacting of the powders. Temperature dependences of the thermoelectric characteristics of the compacted material were measured in a direction perpendicular to the pressure application axis in the 100—700 K range. It is demonstrated that the compacted samples possess low thermal conductivity while retaining the Seebeck coefficient and the electrical conductivity values comparable to crystallized material; therefore ZT reaches 1,05—1,15 in the 330—350 K range which indicates high prospects of applying these technologies.
Highlights
P–type thermoelectric Bi0,5Sb1,5Te3 powders were obtained by the melt spinning technique and their structural and dimensional characteristics were characterized
The powders were compacted by vacuum hot pressing and spark plasma sintering
We found that the partial axial texture [001] directed along the axis of pressure application could be formed during the compacting of the powders
Summary
Процесс спиннингования проводили при температуре расплавленного материала 923 К. Стабилизирующий отжиг спрессованных образцов осуществляли при температуре 593 К в течение 12 ч. Размеры области когерентного рассеяния (ОКР) были определены по формуле Шерера:. Где d — средний размер кристаллитов, нм; λ — длина волны использованного рентгеновского излучения, λ(СuKα) = 0,154051 нм; β — ширина пика на половине высоты, рад; θ — угол дифракции, рад; k — константа Шерера = 0,9. Измерения предела прочности на сжатие спрессованных образцов выполняли на электродинамической системе ElectroPuls E1000 при комнатной температуре. Коэффициент Зеебека, удельные электро− и теплопроводность образцов размером 5 × 5 × 10 мм измеряли при комнатной температуре до и после отжига и в интервале температур 100—700 К после отжига. Решеточную составляющую теплопроводности определяли как κр = κ − κэл;. Где κр — решеточная составляющая теплопроводности; А — число Лоренца; Т — температура.
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