We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Enhanced Electrical Properties of La $$_{0.7}$$ (Ca $$_{0.2}$$ Sr $$_{0.1}$$ ) MnO $$_{3}$$ Polycrystalline Composites with Ag Addition.
- Authors
Yue, Xuejiao; Zhan, Yanhong; Liu, Xiang; Gu, Gang; Wang, Qiangshen; Yin, Xuepeng
- Abstract
La $$_{0.7}$$ (Ca $$_{0.2}$$ Sr $$_{0.1}$$ )MnO $$_{3}$$ :Ag $$_{x }$$ (LCSMO:Ag $$_{x}$$ , x = 0, 0.1, 0.2 and 0.3, mol%) polycrystalline composites were prepared by a solid-state reaction method. With the increasing of Ag addition, the temperature coefficient of resistance (TCR) and the metal-to-insulator transition temperature ( $$T_\mathrm{p}$$ ) reach the maximum values of 9.1 % K $$^{-1}$$ and 258 K for LCSMO:Ag $$_{x}$$ ( x = 0.3) sample, which can be used as a candidate of bolometer or infrared detectors. The improvement of Mn $$^{4+}$$ concentration and grain connectivity by Ag addition is responsible for the enhancement of $$T_\mathrm{p}$$ and TCR values. The fitting curves of electrical resistivity show that the low temperature region ( $$T < T_\mathrm{p}$$ ) is fitted with grain/domain boundary, electron-electron, and magnon scattering mechanisms, as well as the high temperature region ( $$T > T_\mathrm{p}$$ ) is fitted with adiabatic small-polaron hopping mechanism.
- Subjects
ELECTRIC properties; POLYCRYSTALS; COMPOSITE materials; SILVER compounds; LANTHANUM compounds
- Publication
Journal of Low Temperature Physics, 2015, Vol 180, Issue 5/6, p356
- ISSN
0022-2291
- Publication type
Article
- DOI
10.1007/s10909-015-1319-5