Preparation of γ‐LaSy (1.33<y<1.50) alloys by the pressure‐assisted reaction sintering method and their thermoelectric properties
Preparation of γ‐LaSy (1.33<y<1.50) alloys by the pressure‐assisted reaction sintering method and their thermoelectric properties
复制标题
压力辅助反应烧结法制备γ-LaSy(1.33<y<1.50)合金及其热电性能
DOI：
10.1063/1.335373
复制
发表时间：
1985
影响因子：
3.2
通讯作者：
B. Beaudry
中科院分区：
文献类型：
--
作者：
T. Takeshita;K. Gschneidner;B. Beaudry
采用压力辅助反应烧结（PARS）方法制备了γ相三硫化镧固溶体合金热电元件，该合金存在较宽的均匀范围：LaSy（1.33<y<1.5）。将化学计量的三硫化镧 (La2S3) 和三氢化镧 (LaH3) 粉末的混合物在热压机中反应烧结，制成所需成分的 γ-LaSy。该方法生产出理论密度为 97% 或更高的黑色致密单相 γ-LaSy 颗粒。测量了通过PARS技术制备的样品的热电性能（电阻率和塞贝克系数）。 γ-LaSy 的室温电阻率和塞贝克系数随电子浓度的变化而系统变化，表明 γ-LaSy 合金的行为类似于简单金属。尽管电流载流子似乎相当重（漂移迁移率 ~3 cm2/V s），但发现 LaS1.42 的这些特性的温度依赖性（高达 1000°C）...
The pressure‐assisted reaction sintering (PARS) method was used to prepare thermoelectric elements of the γ‐phase lanthanum sesquisulfide solid solution alloys which exist over a wide homogeneity range: LaSy (1.33<y<1.5). A mixture of powders of stoichiometric lanthanum sesquisulfide (La2S3) and lanthanum trihydride (LaH3) was reaction sintered in a hot‐press to make the desired composition of γ‐LaSy. This method produced black dense single‐phase γ‐LaSy pellets with a theoretical density of 97% or better. The thermoelectric properties (electrical resistivity and Seebeck coefficient) of the samples prepared by the PARS technique were measured. The room temperature electrical resistivity and Seebeck coefficient of γ‐LaSy varied in a systematic manner with the electron concentration indicating that γ‐LaSy alloys behave like a simple metal. Although the current carriers appear to be quite heavy (drift mobility ∼3 cm2/V s), the temperature dependence (up to 1000 °C) of these properties of LaS1.42 were found to...