A-site Ca/Sr co-doping to optimize room-temperature TCR of La0.7Ca0.3-xSrxMnO3 films. Issue 8 (15th April 2022)

• Record Type: Journal Article
• Authors: Guan, Xiaoli; Li, Hongjiang; Gu, Xin; Yu, Zhiyuan; Jin, Shuaizhao; Yu, Xiaohan; Liu, Xiang
• Is Part Of: Ceramics international. Volume 48:Issue 8(2022)
• Page Start: 11094
• Page End: 11102
• Publication Date: 2022-04-15
• Subjects: A-site Ca/Sr co-doping -- Sol-gel spin coating -- Room-temperature TCR -- Perovskite manganese oxides films; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2021.12.329
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Based on the analysis of crystal structure, Mn 3+ /Mn 4+ pairs, distortion of MnO6 octahedron, and electrical transport properties of La1- x Ca x MnO3 and La1- x Sr x MnO3 materials, room-temperature coefficient of resistivity ( TCR ) of La0.7 Ca0.3- x Sr x MnO3 (LCSMO) films was optimized by Ca/Sr co-doping at the A-site. LCSMO films are successfully fabricated on LaAlO3 ( 100 ) substrates via facile spin coating technology. The microstructure of LCSMO films is characterized by X-ray diffraction, Raman spectroscopy, Fourier transform infrared spectroscopy, atomic force microscopy and X-ray photoemission spectroscopy. Results reveal that A-site Ca/Sr co-doping significantly influenced crystal structure, formation of Mn 3+ /Mn 4+ pairs, and distortion of MnO6 octahedron. The correlation between microstructure and electrical transport properties was explained through the phenomenological percolation model, double-exchange mechanism and Jahn-Teller effect. Furthermore, the TCR reached 10.2% K -1 at 296.1 K in La0.7 Ca0.18 Sr0.12 MnO3 films.