Growth and Properties of Single Crystals of Hexagonal Ferrites
Growth and Properties of Single Crystals of Hexagonal Ferrites
复制标题
六方铁氧体单晶的生长及性能
DOI：
10.1111/j.1151-2916.1964.tb14633.x
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发表时间：
1964
期刊：
影响因子：
--
通讯作者：
A. Tauber
中科院分区：
文献类型：
--
作者：
R. O. Savage;A. Tauber
长达 1/2 英寸的六方铁氧体单晶由 NaFeO2-Fe2O3-BaO-MeO 系统生长而成，其中 Me = 二价 Zn、Co、Ni 或 Mg。 NaFeO2 是在铂坩埚中从最高温度 1250°C 到 1375°C 生长晶体的助熔剂。尝试了超过 150 次单晶生长实验，并通过 X 射线衍射和光学显微镜研究了反应产物。主要单晶产品的稳定性数据是针对位于四元平面的初始成分给出的。这些平面被认为对应于 Ba2Me2Fe12O22(Y) 和 Ba2Me2Fe28O46(X) 的化合物 1/1、Ba3Me2Fe24O41(Z) 的 3/2、Ba4Me2Fe36O60(U) 的 2/1 和 BaMe2-Fe16O27(W) 的 1/2（Me = Zn、Co、Ni、或镁）。还考虑了许多相邻的飞机。所有五种已知的结构类型均生长为单晶。发现了一系列四种新的六方铁氧体结构。这些是通过系统地添加 Y 块而从 Z 衍生而来的。研究了两种结构类型的晶体的磁化强度作为温度和场的函数。研究了相同两种结构类型的取代晶体的室温铁磁共振和有效各向异性。
Single crystals of hexagonal ferrites up to 1/2 in. long were grown from the system NaFeO2-Fe2O3-BaO-MeO, where Me = divalent Zn, Co, Ni, or Mg. NaFeO2 was the flux from which crystals were grown in platinum crucibles from a maximum temperature of 1250° to 1375°C. More than 150 single-crystal growth experiments were attempted and the reaction products were studied by X-ray diffraction and optical microscopy. Stability data for the principal single-crystal products are given for initial compositions lying in quaternary planes. Such planes were considered for BaO/MeO ratios corresponding to the compounds 1/1 for Ba2Me2Fe12O22(Y) and Ba2Me2Fe28O46(X), 3/2 for Ba3Me2Fe24O41(Z), 2/1 for Ba4Me2Fe36O60(U), and 1/2 for BaMe2-Fe16O27(W)(Me = Zn, Co, Ni, or Mg). A number of adjoining planes were also considered. All the five known structure types were grown as single crystals. A series of four new hexagonal ferrite structures was discovered. These were derived from Z by systematically adding blocks of Y. Magnetization as a function of temperature and field was investigated for crystals of two structure types. The room-temperature ferromagnetic resonance and effective anisotropy were studied for substituted crystals of the same two structure types.