Formation of nickel-zinc ferrite embedded in a silica xerogel matrix

被引：16
|
作者：
Ponce-Castañeda, S [1 ]
Martínez, JR
Sánchez, SAP
Ruiz, F
Matutes-Aquino, JA
机构：
[1] Univ Autonoma San Luis Potosi, Fac Ciencias, San Luis Potosi 78000, Mexico
[2] Inst Potosino Invest Cient & Tecnol, San Luis Potosi, Mexico
[3] Ctr Invest Mat Avanzados, Chihuahua, Mexico
来源：
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY | 2002年 / 25卷 / 01期
关键词：
sol-gel; infrared spectroscopy; vibrating sample magnetometry; X-ray diffraction; composites;
D O I：
10.1023/A:1016036910040
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
We report a study using X-ray diffraction, refinement Rietveld, IR absorption spectroscopy and vibrating sample magnetometry of the formation of particles of Ni-Zn ferrites embedded in a xerogel SiO2 matrix. Initial solutions were prepared mixing TEOS, distilled water, ethanol, and three different nitrates: iron, nickel and zinc. A molar ratio H2O:TEOS:Et-OH of 11.66:1.0:4.0 was used in all solutions. Formation of Ni0.5Zn0.5Fe2O4 as well as structural modifications of the SiO2 matrix induced by these particles are discussed. Ni-Zn crystals having dimensions varying from 4 to 16.5 nm have been synthesized by a suitable heat treatment schedule at temperatures varying from 700 to 1100degreesC. The coercivity values for different heat-treated samples are found in the range 11-193 Oe, which are significantly larger than those presented by bulk Ni-Zn ferrites.
引用
收藏
页码：37 / 41
页数：5
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