Journal
CERAMICS INTERNATIONAL
Volume 44, Issue 1, Pages 550-555Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2017.09.210
Keywords
LCMO ceramics; Plasma activated sintering; Hot-pressing; Magnetic properties; Electrical transport properties
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Funding
- 111 project [B13035]
- International Science and Technology Cooperation Project of Hubei Province [2016AHB008]
- Hubei Provincial National Natural Science Foundation [2015CFB724, 2016CFA006]
- Self-Determined and Innovative Research Funds of WUT [2017-ZD-2]
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Highly dense La0.67Ca0.33MnO3 (LCMO) ceramics were prepared by plasma activated sintering (PAS) and hot pressing (HP). The comparison of structural, magnetic, and electrical transport properties of the LCMO ceramics after PAS and HP were investigated. XRD and SEM analyses confirmed that both samples exhibited orthorhombic phase with highly dense microstructure. The differences of magnetic and electrical transport properties in PAS and HP LCMO ceramics could be attributed to the different grain sizes, which have an effect on grain boundaries, domain states, Mn-O-Mn bond angles and Mn-O bond lengths. On analyzing the fitting data with several empirical equations, the conduction mechanism of the samples was found to be electron-magnon scattering in the ferromagnetic low-temperature region and variable range hopping (VRH) in the paramagnetic high-temperature region.
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