NDLI: Hydrothermal synthesis and crystal structure of <i>α</i>-LiZnAsO<sub>4</sub>

Content Provider	Royal Society of Chemistry (RSC)
Author	Hanson, Jonathan C. Stein, P. C. Norby, Poul Jensen, Torben R. Simonsen, Ole Skou, Eivind M. Bøye, Hans A.
Copyright Year	1998
Abstract	Single crystals of lithium zinc arsenate,α-LiZnAsO4 , suitable for structure determination were prepared from an aqueous solution of H3AsO4 , Zn(NO3)2 and LiOH under hydrothermal conditions, at 240 °C. α-LiZnAsO4 has a fully ordered phenacite structure built from a three-dimensional framework of cornersharing AsO4 , ZnO4 and LiO4 tetrahedra. The tetrahedra form nets of six-rings surrounded by six four-rings in the direction of the c-axis. α-LiZnAsO4 crystallises in the trigonal space group R3 (no. 146), a=14.009(2), c=9.386(2) Å, Z=18 and Dc=3.958 g cm–3 . The structure was refined to: wR(F2)=0.130, R(F)=0.050 andS=0.982, for F2>2sigma;(F2). Synchrotron radiation, λ=0.9540 Å, was used for single crystal diffraction giving 917 unique reflections. Solid state 7Li MAS NMR showed a broadened Li signal implying more than one inequivalent Li (δ 0.21, reference: 1.00 mol dm–3 LiCl). Linear thermal expansion coefficients in the temperature range 25–800 °C were determined using time resolved in situ synchrotron X-ray powder diffraction. A weak reversible, possibly second order, thermal event was observed at 682(1) °C using differential scanning calorimetry.
Starting Page	969
Ending Page	975
Page Count	7
File Format	PDF
ISSN	09599428
Volume Number	8
Issue Number	4
Journal	Journal of Materials Chemistry
DOI	10.1039/a707130b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Li Lithium Zinc Arsenate Hydrothermal circulation Phenakite Tetrahedron Space group Synchrotron radiation Diffraction Magic angle spinning Nuclear magnetic resonance Lithium chloride Thermal expansion Synchrotron Powder diffraction Differential scanning calorimetry
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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