High-pressure synthesis, crystal structure and magnetic property of ilmenite-type FeGeO3

High-pressure synthesis, crystal structure and magnetic property of ilmenite-type FeGeO3
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钛铁矿型FeGeO3的高压合成、晶体结构及磁性能

DOI:
10.1016/j.jssc.2012.11.020
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发表时间:
2013
影响因子:
3.3
通讯作者:
T. Fujii
T. Fujii
中科院分区:
化学3区
文献类型:
--
作者:
D. Nakatsuka;T. Yoshino;J. Kano;H. Hashimoto;M. Nakanishi;J. Takada;T. Fujii

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我们合成了结晶良好的钛铁矿型FeGeO3,研究其结构和磁性。采用Kawai型多砧高压合成装置合成了钛铁矿型FeGeO3。其结构和磁性进行了研究,通过XRD分析与Rietveld细化,透射电子显微镜,穆斯堡尔谱和SQUID磁化测量。高压合成后的后续退火对于提高钛铁矿型FeGeO3的结晶性是有效的。钛铁矿型FeGeO3的一次粒径约为15nm。一些颗粒似乎被非晶相或弱晶相覆盖,甚至在退火后,和其他显示平行于(001)面的层状显微组织。钛铁矿型FeGeO3具有典型的反铁磁行为,其Néel温度为79K。
We synthesized well-crystallized ilmenite-type FeGeO3to investigate its structural and magnetic properties. Ilmenite-type FeGeO3were synthesized by high-pressure synthesis technique using a Kawai-type multi-anvil apparatus. Their structural and magnetic properties were examined by XRD analysis with Rietveld refinement, transmission electron microscopy, Mössbauer spectroscopy and SQUID-magnetization measurements. The subsequent annealing after the high-pressure synthesis was effective to improve the crystallinity of the ilmenite-type FeGeO3. The primary particle size of ilmenite-type FeGeO3was ∼15nm. Some particles seemed to be covered with non- or poorly crystalline phase even after the annealing, and others showed a lamellar microstructure parallel to the (001) plane. Theilmenite-type FeGeO3showed typical antiferromagnetic behavior with the Néel temperature of 79K.
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