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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Crystal structure investigation of RE-Ni-Zn ternary compounds (RE = La, Ce, Tb)
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Crystal structure investigation of RE-Ni-Zn ternary compounds (RE = La, Ce, Tb)

机译:RE-Ni-Zn三元化合物的晶体结构研究(RE = La,Ce,Tb)

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The RENiZn (RE = La, Tb), RE2Ni2Zn (RE = La, Ce, Tb) and La3Ni3Zn ternary compounds were synthesized by two methods: by heating in a resistance furnace evacuated quartz ampoules containing Al2O3-crucibles with element pieces and by induction melting in sealed Ta crucibles with subsequent annealing at 400 degrees C. Scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDXS) was used for examining microstructure and phase composition of some of the alloys. The crystal structures for all the investigated phases were solved or confirmed on single crystal data by applying the direct methods refined by a standard least square procedure: LaNiZn - str. type ZrNiAl, hexagonal, P62m, hP9, a = 0.7285(1), c = 0.3938(1) nm, wR(2) = 0.0534, 257 F-2 values, 14 variables; a = 0.7044(1), c = 0.3782(1) nm, wR(2) = 0.0447, 236 F-2 values, 14 variables for TbNiZn; La2Ni2Zn - str. type Pr2Ni2Al, orthorhombic, Immm, oI10, a = 0.4381(1), b = 0.5459(1) c = 0.8605(2) nm, wR(2) = 0.0824, 223 F-2 values, 13 variables; a = 0.4365(1), b = 0.5430(1) c = 0.8279(2) nm, wR(2) = 0.0635, 209 F-2 values, 13 variables for Ce2Ni2Zn; a = 0.4209(1), b = 0.5366(1) c = 0.8165 (1) nm, wR(2) = 0.0757, 200 F-2 values, 13 variables for Tb2Ni2Zn; La3Ni3Zn - str. type Y3Co3Ga, orthorhombic, Cmcm, oS28, a = 0.4276(1), b = 1.0310(2) c = 1.3636(3) nm, wR(2) = 0.0859, 579 F-2 values, 26 variables. The structural peculiarities of these compounds and their relations are discussed.
机译:RENiZn(RE = La,Tb),RE2Ni2Zn(RE = La,Ce,Tb)和La3Ni3Zn三元化合物是通过以下两种方法合成的:在电阻炉中加热排空的含Al2O3坩埚的石英安瓿,并进行感应熔化在密封的Ta坩埚中加热,随后在400摄氏度下退火。使用扫描电子显微镜(SEM)结合能量色散X射线光谱(EDXS)来检查某些合金的微观结构和相组成。通过应用通过标准最小二乘程序LaNiZn-str精制的直接方法,可以在单晶数据上解析或确认所有研究相的晶体结构。 ZrNiAl型,六角形,P62m,hP9,a = 0.7285(1),c = 0.3938(1)nm,wR(2)= 0.0534,257 F-2值,14个变量; a = 0.7044(1),c = 0.3782(1)nm,wR(2)= 0.0447,236个F-2值,TbNiZn的14个变量; La2Ni2Zn-str。 Pr2Ni2Al类型,正交晶,Immm,oI10,a = 0.4381(1),b = 0.5459(1)c = 0.8605(2)nm,wR(2)= 0.0824,223 F-2值,13个变量; a = 0.4365(1),b = 0.5430(1)c = 0.8279(2)nm,wR(2)= 0.0635,209 F-2值,Ce2Ni2Zn的13个变量; a = 0.4209(1),b = 0.5366(1)c = 0.8165(1)nm,wR(2)= 0.0757,200 F-2值,Tb2Ni2Zn的13个变量; La3Ni3Zn-str。 Y3Co3Ga型,正交晶体,Cmcm,oS28,a = 0.4276(1),b = 1.0310(2)c = 1.3636(3)nm,wR(2)= 0.0859、579个F-2值,26个变量。讨论了这些化合物的结构特点及其关系。

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