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- W1977719670 abstract "Abstract The crystal structures of flux-grown Li 2 (MoO 4 ), LiY(MoO 4 ) 2 and LiNd(MoO 4 ) 2 were solved and refined from single-crystal intensity data collected with a four-circle diffractometer (Mo K α X-radiation, CCD area detector, room temperature). Li 2 (MoO 4 ) is isostructural with phenacite, Be 2 (SiO 4 ) and has space group R 3̅, a = 14.330(2), c = 9.584(2) Å, Z = 18 (R1 = 1.6%). The structure consists of a three-dimensional network of corner-linked, slightly distorted LiO 4 and fairly regular MoO 4 tetrahedra. Average Li–O and Mo–O distances are 1.965 Å (Li1) and 1.967 Å (Li2), and 1.764 Å (Mo). The atomic arrangement is characterised by a narrow open channel along the three-fold axis. Comparisons are drawn with other phenacite-type compounds. Low-temperature single-crystal X-ray studies of Li 2 (MoO 4 ) in the range from 103 to 293 K gave no evidence of a phase transition, thus contradicting recent literature reports. Both LiY(MoO 4 ) 2 and LiNd(MoO 4 ) 2 crystallise in the scheelite-type structure, with space group I 4 1 /a and Z = 2 ( R 1 = 1.7 and 2.7 %, re-spectively). The first has a = 5.148(1), c = 11.173(2) Å, V = 296.11(10) Å3, the latter a = 5.243(1), c = 11.440(2) Å, V = 314.47(10) Å 3 . Both Li and Y/Nd are completely disordered on a jointly occupied site. Mean (Y,Li)– and (Nd,Li)–O distances are 2.40 and 2.47 Å, respectively. In both compounds the unique MoO 4 tetrahedron has four identical Mo–O bonds with lengths of 1.779 Å. The stoichiometry of Li RE (MoO 4 ) 2 ( RE = rare-earth element) compounds is discussed and the relation to structure types of other MRE (XO 4 ) 2 ( M = alkali metal, X = Mo, W) compounds is briefly addressed." @default.
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- W1977719670 date "2001-08-01" @default.
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- W1977719670 title "The crystal structures of phenacite-type Li<sub>2</sub>(MoO<sub>4</sub>), and scheelite-type LiY(MoO<sub>4</sub>)<sub>2</sub> and LiNd(MoO<sub>4</sub>)<sub>2</sub>" @default.
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- W1977719670 doi "https://doi.org/10.1524/zkri.216.8.449.20358" @default.
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