Thermodynamic Understanding of Impurity Phase Segregation in a PdCrO2/CuCrO2 Heterostructure

被引：0
|
作者：
Ichibha, Tom [1 ,2 ]
Yoon, Sangmoon [1 ,3 ]
Ok, Jong Mok [1 ,4 ]
Yoon, Mina [1 ]
Lee, Ho Nyung [1 ]
Reboredo, Fernando A. [1 ]
机构：
[1] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA
[2] Japan Adv Inst Sci & Technol, Sch Informat Sci, 1-1 Asahidai, Nomi, Ishikawa 9231292, Japan
[3] Gachon Univ, Dept Phys, Seongnam 13306, South Korea
[4] Pusan Natl Univ, Dept Phys, Pusan 46241, South Korea
来源：
ADVANCED PHYSICS RESEARCH | 2023年 / 2卷 / 10期
关键词：
2D metal; delafossites; density functional theory calculations; thin films; CRYSTAL-GROWTH; PDCOO2; OXIDES;
D O I：
10.1002/apxr.202200080
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
PdCrO2 films are synthesized on CuCrO2 buffer layers on Al2O3 substrates. This synthesis is accompanied by impurity phase segregation, which hampers the synthesis of high quality PdCrO2 films. Potential causes ofth impurity phase segregation are studied by using a combination of experiments and ab initio calculations. X-ray diffraction and scanning transmission electron microscopy experiments reveal impurity phases of CuxPd1 - x alloy and chromium oxides, Cr2O3 and Cr3O4, in PdCrO2. Calculations determine that oxygen deficiency can cause the impurity phase segregation. Therefore, preventing oxygen release from delafossites can suppress the impurity phase segregation. The amounts of Cr2O3 and Cr3O4 depend on temperature and oxygen partial pressure. A reasonable theory-based explanation for this experimental observation is provided.
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页数：8
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