双稀土氧化物LnEuO3的Mossbauer效应研究

Mossbauer Effect Studied in the Double Rare-Earth Oxides LnEuO3

Research Group of Rare Earth Solid State Physics, Jilin University, Changchun 130023, China

摘要: 本文首次利用高温高压方法合成了双稀土氧化物LaEuO3、PrEuO3、NdEuO3和SmEuO3。此外，还合成了CeEuO3.5。X射线衍射分析表明LaEuO3属A型（六方）结构，PrEuO3、NdEuO3和SmEuO3属B型（单斜）结构，CeEuO3.5属F型（萤石）结构。室温下用151Eu的21.6 eV 射线测量了它们的Mossbauer谱，观察到了151Eu同质异能移位和四极劈裂强烈地依赖于Eu离子配位体体积而呈线性关系。超精细相互作用的这种体积效应，主要原因是由于Eu离子5s壳层的重叠畸变所引起。
- LnEuO3 /
- 高压合成 /
- 同质异能移位 /
- 体效应
Abstract: For the first time, the double rare-earth oxides LaEuO3, PrEuO3, NdEuO3, SmEuO3 were synthesized by using high pressure and high temperature method. The analyses of X-ray diffraction show that LaEuO3 is A-type (hexagonal) structure; PrEuO3, NdEuO3 and SmEuO3 are of B-type (monoclinic) structure; CeEuO3.5 is of F-type (fluorite) structure. Mossbauer spectra were measured using the 21.6 keV -ray of 151Eu at room temperature. It has been observed that the hyperfine interactions depend strongly on the ligand volume of Eu ions. This volume effect of the isomer shift can be mainly attributed to the distortion of 5s shell of Eu ions.
- LaEuO3 /
- high pressure synthesis /
- isomer shift /
- volume effect