稀土取代鈣錳氧化物的介電性質

Abstract

本論文研究稀土取代鈣錳氧化物 [Ca2-xLnxMnO4, 其中 Ln = Nd and Y] 的製作、特性、介電性質，而介電性質在絕對溫度20 K ~ 300 K之間以20 Hz ~ 1 MHz外加電壓頻率作研究。 Ln = Nd或Y時，在x > 0.3時觀察低溫的介電的相，活化能會隨著取代量x增加而增加。研究介電常數、損耗因子、熱激發的活化能、模數和柯爾柯爾圖等極化性質。

The synthesis, characterization and dielectric properties of rare earths substituted calcium manganese oxides [Ca2-xLnxMnO4, where Ln = Nd and Y] compounds were investigated. The dielectric properties of these compounds were studied in the frequency range from 20 Hz to 1 MHz between 20 K and 300 K. The low temperature dielectric properties is studied when x > 0.3 for Ln = Nd and Y. The activation energies increase as the amount of substitution x increase. Compounds for x > 0.3 are studied in dielectric permittivity, dissipation factor, activation energy with thermally activated process, modulus spectra, and cole-cole plot.