Dielectric anomaly in La1?xSrxFeO3± perovskite nanoparticles

被引：1

作者：

Abdel-Khalek, E. K. ^{[1
]}

机构：

[1] Al Azhar Univ, Dept Phys, Fac Sci, Cairo, Egypt

来源：

FERROELECTRICS | 2016年 / 505卷 / 01期

关键词：

Co-precipitation method; structural; thermal; dielectric and magnetic properties; MAGNETIC-PROPERTIES; SYSTEM; LA1-XSRXFEO3; MOSSBAUER; OXIDATION; OXYGEN; CO;

D O I：

10.1080/00150193.2016.1255128

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

La1?xSrxFeO3 +/- nanoparticles (where x = 0.05 and 0.10) were synthesized by co-precipitation method. The nanoparticle samples have orthorhombic (Pbnm) phase with small impurities as confirmed from X-ray diffraction (XRD) with Rietveld analysis and transmission electron microscopic (TEM). Nonstoichiometric and valence states of iron ions (Fe3+, Fe4+ and Fe5+) were established by Mossbauer spectroscopy at room temperature (RT). The dielectric constant as a function of frequency (100Hz to 1 MHz) and temperature (293-503 K) exhibits dielectric anomaly which is an evident the ferroelectric-paraelectric phase transition. Relaxor ferroelectrics were established by differential scanning calorimetric (DSC) which is confirmed by dielectric study. The magnetic properties of the samples exhibit the weak ferromagnetism at RT.

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页码：130 / 140

页数：11

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