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具有类白钨矿结构的KGd(MoO_4)_2的晶体结构和能带结构(英文) 被引量:1

Single-Crystal Structure and Bond Structure of Scheelite-Like KGd(MoO_4)_2
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摘要 以Gd2O3、K2CO3、MoO3为原料,采用高温熔盐法,合成了一个含钾的稀土钼酸盐KGd(MoO4)2。通过X射线单晶衍射法测定了它在室温下的晶体结构,并测定了它的光学性质。结构分析表明它属于三斜晶系,空间群为P1,a=0.529 23(6)nm,b=0.692 10(6)nm,c=1.068 89(7)nm,α=75.79(8)°,β=76.79(5)°,γ=67.60(4)°,Z=2,R1(all data)=0.025 8。结构中的K和Gd原子位于各自的晶体学位置,不存在调制结构的现象。此外,我们用得到的晶体学数据,通过密度泛函理论研究了化合物的能带结构、态密度、介电常数,其结果和实验数据相吻合。 High-temperature reaction of Gd203, K2CO3 and MoO3 leads to a potassium lanthanide molybdate, namely, KGd(MoO4)2. The structure of KGd(Mo04)2 was investigated by means of single-crystal X-ray diffraction at room temperature. Structural analysis results show that it crystallizes in triclinic space group P1 with a=0.529 23(6) nm, b=0.692 10(6) nm, c=1.068 89(7) nm, a=75.79(8)°, /3=76.79(5)°, 7=67.60(4)°, Z=2 and Rl(all data)=0.025 8. K and Gd atoms occupy their respective crystallographic distinct sites. No occupancy disorder and structural modulation exist in the structure. Furthermore, the obtained crystallographic data are used to calculate the band structure, density of states and dielectric constants with the density functional theory method. The results tend to support the experimental data. CSD: 427391.
出处 《无机化学学报》 SCIE CAS CSCD 北大核心 2014年第5期1143-1150,共8页 Chinese Journal of Inorganic Chemistry
基金 国家自然科学基金(No.21201056) 河南省科技厅(No.122300410418)资助项目
关键词 晶体结构 稀土钼酸盐 能带结构 crystal structure lanthanide molybdate bond structure
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