鐠鈣錳氧化物的介電性質

Dielectric Response of Praseodymium Substituted Calcium Manganese Oxides[PrxCa2-xMnO4]

潘明信(Ming-Hsin Pan)

指導教授 ： 陳政維

國立臺灣大學/理學院/應用物理研究所/碩士(2016年)

https://doi.org/10.6342/NTU201602135

摘要

無資料

關鍵字

介電性質 ； 鈣錳氧化物

並列摘要

The synthesis, characterization and dielectric properties of Praseodymium substituted calcium manganese oxides [PrxCa2-xMnO4] compounds were investigated. The dielectric properties of these compounds were studied in the frequency range from 20 Hz to 1 MHz between 10 K and 300 K.
The low temperature dielectric properties were studied for the x = 0 ~ 0.5 compounds. Dielectric permittivity, dissipation factor, activation energy with thermally activated process, modulus spectra, and Cole-Cole plot have been investigated.
The ε'(T) curves of samples show that the value of real dielectric permittivity has apparent high value (ε' ~ 104) near 270 K for x = 0.2, 0.3, 0.4, 0.5. The tanδ(T) curves of these compounds exhibit dielectric relaxation at low temperature. The highest values in M”-T relation are found to increase with increasing with increasing x for the PrxCa2-xMnO4 system. The peak temperatures of tanδ shift from low to high temperatures as the test frequency  increases in all samples. In these samples we also observed Jonscher power law behavior.

並列關鍵字

Dielectric response ； Manganese Oxide

參考文獻

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