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- Title
Structural and electrical properties of monovalent K doping in Pr<sub>0.6</sub>(Sr<sub>1-x</sub>K<sub>x</sub>)<sub>0.4</sub>MnO<sub>3</sub> polycrystalline ceramics.
- Authors
Zhao, Liming; Pu, Xingrui; Guan, Xiaoli; Jin, Shuaizhao; Yu, Xiaohan; Wu, Kaikai; Yan, Yixin; Gu, Xin; Liu, Xiang
- Abstract
Pr0.6(Sr1-xKx)0.4MnO3 polycrystalline ceramics (PSKMO, 0 ≤ x ≤ 0.25) were fabricated via using sol–gel method. The structure of PSKMO ceramics was identified to be the orthorhombic structure with Pnma space group. As K-concentration (x) rose, grain sizes increased significantly. The constituent elements of PSKMO ceramics were uniformly distributed on the surface. From the resistivity dependence of temperature (ρ-T) curves, it was clear that resistivity rose with the increase of K-concentration. Notably, the peak temperature coefficient of resistivity (TCR) and temperature (Tk) decreased as x rose in this study. This result was attributed to the disorder of cation size on A-site ( σ 2 ), which induced lattice strain leading to the random displacement of O2− ions. Further, it led to the distortion of MnO6 octahedron that promoted the localization of electrons, thereby reducing Tk. Moreover, the maximum value of TCR reached 7.60% K−1 at 299.31 K (for x = 0.15). This result suggested that the Pr0.6(Sr0.85K0.15)0.4MnO3 ceramic was befitting for application in advanced uncooled infrared bolometers.
- Publication
Journal of Materials Science: Materials in Electronics, 2023, Vol 34, Issue 10, p1
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-023-10271-7