Enhanced Thermoelectric Properties of Misfit Bi2Sr2-xCaxCo2Oy: Isovalent Substitutions and Selective Phonon Scattering

被引：6

作者：

Chatterjee, Arindom ^{[1
,2
]}

Banik, Ananya ^{[3
]}

El Sachat, Alexandros ^{[1
,2
]}

Roque, Jose Manuel Caicedo ^{[1
,2
]}

Padilla-Pantoja, Jessica ^{[1
,2
]}

Torres, Clivia Sotomayor M. ^{[1
,2
,4
]}

Biswas, Kanishka ^{[3
]}

Santiso, Jose ^{[1
,2
]}

Chavez-Angel, Emigdio ^{[1
,2
]}

机构：

[1] Campus Univ Autonoma Barcelona UAB, Catalan Inst Nanosci & Nanotechnol ICN2, CSIC, Bellaterra, Barcelona 08193, Spain

[2] Campus Univ Autonoma Barcelona UAB, BIST, Bellaterra, Barcelona 08193, Spain

[3] Jawaharlal Nehru Ctr Adv Sci Res JNCASR, Sch Adv Mat, New Chem Unit, Bangalore, India

[4] ICREA Catalan Inst Res & Adv Studies, Barcelona 08010, Spain

来源：

MATERIALS | 2023年 / 16卷 / 04期

基金：

欧盟地平线“2020”;

关键词：

misfit cobaltates; thermoelectric properties; misfit-layer; isovalent substitutions; OXIDE MATERIALS; THIN-FILMS; BI2SR2CO2OY; THERMOPOWER; FIGURE; POWER;

D O I：

10.3390/ma16041413

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Layered Bi-misfit cobaltates, such as Bi2Sr2Co2Oy, are the natural superlattice of an electrically insulating rocksalt (RS) type Bi2Sr2O4 layer and electrically conducting CoO2 layer, stacked along the crystallographic c-axis. RS and CoO2 layers are related through charge compensation reactions (or charge transfer). Therefore, thermoelectric transport properties are affected when doping or substitution is carried out in the RS layer. In this work, we have shown improved thermoelectric properties of spark plasma sintered Bi2Sr2-xCaxCo2Oy alloys (x = 0, 0.3 and 0.5). The substitution of Ca atoms affects the thermal properties by introducing point-defect phonon scattering, while the electronic conductivity and thermopower remain unaltered.

引用

页数：12

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