Phase Transformation and Magnetic Properties of La-Ca-Co-Zn Doped M-type Hexaferrites

被引：0

作者：

An Jianzhang ^{[1
]}

Ye Jinwen ^{[1
]}

Tang Zhenghua ^{[1
]}

Chen Yike ^{[2
]}

Qin Yao ^{[3
]}

机构：

[1] Sichuan Univ, Chengdu 610041, Sichuan, Peoples R China

[2] Chengdu Jintaiprecistech Co Ltd, Chengdu 610041, Sichuan, Peoples R China

[3] Southwest Petr Univ, Chengdu 610500, Sichuan, Peoples R China

来源：

RARE METAL MATERIALS AND ENGINEERING | 2019年 / 48卷 / 08期

关键词：

intermediate phase; phase changes; magnetic properties; thermal analysis; SYSTEM; SUBSTITUTION;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The phase transformation process from 25 degrees C to 1450 degrees C and the magnetic properties of Sr0.3La0.3Ca0.4Fe10.625-Co0.225Zn0.1O19 were investigated by high-temperature X-ray diffraction, thermal analysis, vibrating sample magnetometer and scanning electron microscopy. The results show that the formation of M-type hexagonal ferrites in air passes through two endothermal reactions. SrCO3 and partial Fe2O3 first generate the intermediate phase Sr3Fe2O7.d around 700 degrees C. And then Sr3Fe2O7-d and the remaining unreacted Fe2O3 generate SrFe12O19. Meanwhile, La3+, Ca2+, Co2+ and Zn2+ ions gradually dissolve in the intermediate phase or the latter product M phase with the temperature increasing. The perovskite was obtained when annealed at about 700 degrees C, which may transform perovskite into Sr3Fe(2)O(7).d during the cooling process. The average valence of Fe in Sr3Fe2O7-d is a function of temperature. A very high single degree of M phase and a small number of second phase were obtained at about 1200 degrees C, and the cationic are evenly distributed in the crystal. The rectangularity of the demagnetizing curves of the LaCaCoZn-type substituted ferrite powder decreases compared to that of unsubstituted ferrite powder. The ferrite will be decomposed at about 1380 degrees C.

引用

页码：2447 / 2453

页数：7

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