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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Nitrides with inverse K_2[NiF_4] structure: (R _(1-x)Ca_(3+x)N_(1-x/3))Bi_2with R = rareearth metal
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Nitrides with inverse K_2[NiF_4] structure: (R _(1-x)Ca_(3+x)N_(1-x/3))Bi_2with R = rareearth metal

机译：逆K_2 [NiF_4]结构的氮化物：（R _（1-x）Ca_（3 + x）N_（1-x / 3））Bi_2（R =稀土金属）

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摘要

The novel nitrides (R_(1-x)Ca_(3+x)N_(1-x/3)) Bi_2 (with R = La, Ce, Pr) crystallize in the K_2[NiF _4] structure type (14/mmm, No. 139, Z = 2). Samples (La _(1-x)Ca_(3+x)N_(1-x/3))Bi_2 with x = 0.1.0, 0.05, 0.00, (Ce_(1-x)Ca_(3+x)N_(1-x/3))Bi_2 with x = 0.30, and (PrCa_3N)Bi_2 were obtained as single phase microcrystalline powders according to X-ray diffraction and the crystal structure details were derived from Rietveld refinements based on X-ray and neutron diffraction powder patterns, A partial order of R~(3+)/Ca ~(2+)on two crystallographic sites is governed by different ionic radii and charges. (La_(1-x)Ca_(3+x)N_(1-x/3))Bi_2 and (Ce_(1-x)Ca_(3+x)N_(1-x/3))Bi_2 exhibit small homogeneity ranges and typically a nitrogen deficiency. In contrast, for (PrCa_3N)Bi_2 no indications for a significant homogeneity range or deficiency of nitrogen was observed. (La_(1-x)Ca _(3+x)N_(1-x/3))Bi_2 with x = 0.05 is a diamagnet. X-ray absorption spectroscopy at the CeL_3-edge as well as magnetic susceptibility measurements evidence that (Ce_(1-x)Ca_(3+x) N_(1-x/3)Bi_2 with x = 0.30 contains Ce~(3+)in the 4f~1 configuration. According to electrical resistivity data, samples from all three systems are heavily doped semiconductors.
机译：新型氮化物（R_（1-x）Ca_（3 + x）N_（1-x / 3））Bi_2（R = La，Ce，Pr）结晶为K_2 [NiF _4]结构类型（14 / mmm ，编号139，Z = 2）。样本（La _（1-x）Ca_（3 + x）N_（1-x / 3））Bi_2，x = 0.1.0，0.05，0.00，（Ce_（1-x）Ca_（3 + x）N_通过X射线衍射获得了x为0.30的（1-x / 3））Bi_2和（PrCa_3N）Bi_2为单相微晶粉末，晶体结构的详细信息来源于基于X射线和中子衍射的Rietveld精制在两个晶体学位置上，R〜（3 +）/ Ca〜（2+）的部分阶由不同的离子半径和电荷控制。 （La_（1-x）Ca_（3 + x）N_（1-x / 3））Bi_2和（Ce_（1-x）Ca_（3 + x）N_（1-x / 3））Bi_2均一性小范围，通常是氮缺乏。相反，对于（PrCa_3N）Bi_2，没有观察到明显的均质范围或氮缺乏的迹象。 （x ＝ 0.05的（La_（1-x）Ca _（3 + x）N_（1-x / 3））Bi_2是一个反磁铁。 CeL_3边缘的X射线吸收光谱以及磁化率测量表明（x = 0.30的（Ce_（1-x）Ca_（3 + x）N_（1-x / 3）Bi_2包含Ce〜（3+在4f〜1的配置中，根据电阻率数据，所有三个系统的样品均为重掺杂半导体。

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