Effect of the calcination temperature on temperature coefficient of resistance and magnetoresistance of La0.67Ca0.33MnO3 polycrystalline ceramics. (November 2022)

• Record Type: Journal Article
• Authors: Li, Yule; Yu, Ping; Wang, Xiaojin; Ling, Fuxin; Zhang, Hui; Chen, Qingming
• Is Part Of: Journal of physics and chemistry of solids. Volume 170(2022)
• Publication Date: 2022-11
• Subjects: La0.67Ca0.33MnO3 -- Temperature coefficient of resistance (TCR) -- Magnetoresistance (MR) -- Calcination process -- Co-precipitation method; Solids -- Periodicals; Solides -- Périodiques; Solids; Periodicals; 530.41
• DOI: 10.1016/j.jpcs.2022.110922
• Languages: English
• ISSNs: 0022-3697

Abstract

Abstract: La0.67 Ca0.33 MnO3 (LCMO) has attracted considerable attention due to its superior colossal magnetoresistance properties, as well as the metal-insulator transition and enhanced temperature coefficient of resistance ( TCR ) characteristics. Here, the co-precipitation method is utilized in order to prepare the LCMO-based ceramics, whose magnetotransport properties as a function of calcination temperature ( T cal ) were thoroughly investigated. The TCR of LCMO exhibits initially an increasing pattern and then decreases by elevating the T cal, whereas the metal-insulator transition temperature ( T MI ) is shifted towards a lower temperature value. In addition, the magnetoresistance ( MR ) was enhanced by enforcing a bigger T cal and reached the value of 82.4% at T cal = 800 °C. The underlying mechanism for the manifestation of such improved properties is thoroughly examined by employing electrical measurements in various temperature ranges. An optimal TCR of 32.3%·K −1 in LCMO-based ceramic was attained with T cal = 500 °C, indicating that the co-precipitation method could be employed in order to facilitate the potential use of LCMO for infrared detecting and magnetoresistive switching applications. Highlights: High quality La0.67 Ca0.33 MnO3 ceramics were prepared by co-precipitation method. The TCR reached 32.3%·K −1 when calcinated at 500 °C, which is the highest in the series. The MR increased as calcination temperature rose and reached 82.4% when calcinated at 800 °C.