Effect of Gd doping on electrical transport properties of La0.8Sr0.2MnO3 polycrystalline ceramics. Issue 5 (1st March 2021)

• Record Type: Journal Article
• Authors: Qi, Longfei; Wang, Chengyi; Li, Yule; Yu, Ping; Gao, Yan; Wu, Dingzhang; Yang, Yunrui; Chen, Qingming; Zhang, Hui
• Is Part Of: Ceramics international. Volume 47:Issue 5(2021)
• Page Start: 5944
• Page End: 5950
• Publication Date: 2021-03-01
• Subjects: La0.8-xGdxSr0.2MnO3 (LGSMO) -- Sol-gel method -- Temperature coefficient of resistance (TCR) -- Resistivity (ρ) -- Magnetoresistance (MR); Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2020.10.128
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Gd doped La0.8 Sr0.2 MnO3 (La0.8-x Gdx Sr0.2 MnO3, LGSMO) ceramics were prepared by a sol-gel method. X-ray diffraction (XRD) patterns showed that all samples exhibited distorted perovskite structures, R3c . When the Gd 3+ content x > 0.03, the crystal structure changed to orthorhombic, Pnma. Scanning electron microscopy (SEM) images showed that the ceramics characterize high density and grain boundary connectivity, and higher Gd 3+ doping decreased the grain size from 26.72 μm to 7.42 μm. The temperature dependence of resistivity showed a transition from a low-temperature metal to a high-temperature insulator. The resistivity increased with Gd doping content, and the metal-insulator transition temperature, T P, increased first and then decreased, while the temperature coefficient of resistance ( TCR ) of the samples first decreased and then increased with Gd 3+, and the magnetoresistance (MR) increased first and then decreased. The peak TCR at x = 0.06 was 5.18%·K −1, and MR at 0.04 was 34.57%. The electrical transport properties of the ceramics were explained based on the double exchange (DE) interaction mechanism. The obtained material may have application prospects in magnetic devices and infrared detectors.