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首页> 外文期刊>Bulletin of the Chemical Society of Japan >The Synthesis,Crystal Structure,and Magnetic Properties of Perovskites Ba_3Ln_2MO_9 (Ln = Lanthanides;M = Mo,W)
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The Synthesis,Crystal Structure,and Magnetic Properties of Perovskites Ba_3Ln_2MO_9 (Ln = Lanthanides;M = Mo,W)

机译：钙钛矿Ba_3Ln_2MO_9（Ln =镧系元素; M = Mo，W）的合成，晶体结构和磁性

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摘要

The synthesis,crystal structure,and magnetic properties of quaternary oxides Ba_3Ln_2MO_9 (Ln = Y,Sm-Gd,Dy-Lu for M = Mo;Ln = Y,Sm-Lu for M = W) are reported.Their powder X-ray diffraction measurements and Rietveld analysis showed that they have a "disordered" perovskite structure,i.e.,BaLn_(2/3)M_(1/3)O_3 except for Ba_3Tb_2WO_9,and that their structures are monoclinic with space group I2/c (Ln = Y,Sm-Gd,Dy-Yb for M = Mo;Ln = Y,Sm-Lu for M = W) or cubic with space group Pm3m (Ln = Lu for M = Mo).Powder neutron diffraction measurements showed that Ba_3Tb_2WO_9 has an ordered perovskite structure and is monoclinic with space group P2_1.Magnetic susceptibility measurements showed that all the Ba_3Ln_2MO_9 compounds are paramagnetic down to 1.8 K.The Tb ions of Ba_3Tb_2WO_9 are in the mixed valence state (+3,+4).Through ~(151)Eu Mossbauer measurements on Ba_3Eu_2MoO_9 and Ba_3Eu_2WO_9,it was found that the Eu ion is in the trivalent state,and that the symmetry of the Eu site is distorted from the octahedral symmetry.
机译：报道了四元氧化物Ba_3Ln_2MO_9的合成，晶体结构和磁性，其中Ln = Y，Sm-Gd，Dy-Lu（M = Mo; Ln = Y，Sm-Lu（M = W））。衍射测量和Rietveld分析表明，它们具有“无序”钙钛矿结构，即BaLn_（2/3）M_（1/3）O_3（Ba_3Tb_2WO_9除外），并且其结构为单斜晶，空间群为I2 / c（Ln = M = Mo的Y，Sm-Gd，Dy-Yb; M = W的Ln = Y，Sm-Lu）或空间群为Pm3m的立方（Mn的Ln = Lu）。磁化率测量表明所有Ba_3Ln_2MO_9化合物在低至1.8 K时都是顺磁性的，Ba_3Tb_2WO_9的Tb离子处于混合价态（+ 3，+ 4）。在Ba_3Eu_2MoO_9和Ba_3Eu_2WO_9上进行〜（151）Eu Mossbauer测量，发现Eu离子处于三价态，且Eu位点的对称性畸变d由八面体对称性决定。

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