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 (\({\sigma }^{2}\)), 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.
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Funding
This work was supported by the National Natural Science Foundation of China (Grant No. 11674135), Yunnan Fundamental Research Projects (Grant No. 202201AS070035), and Analysis and Testing Foundation of Kunming University of Science and Technology (Grant No. 2021P20201130007).
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LZ, XP, and XL conceived and designed this study. Material preparation, data collection, and analysis were performed by LZ, YY, KW, XAG and XIG. The first draft of the manuscript was written by LZ. XAG, SJ, XY, and XL commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Zhao, L., Pu, X., Guan, X. et al. Structural and electrical properties of monovalent K doping in Pr0.6(Sr1-xKx)0.4MnO3 polycrystalline ceramics. J Mater Sci: Mater Electron 34, 902 (2023). https://doi.org/10.1007/s10854-023-10271-7
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DOI: https://doi.org/10.1007/s10854-023-10271-7