Structure of dilithium zinc silicate γ_II-Li₂ZnSiO₄

Abstract

2678fl-VANADIUM NITRIDE hedral holes. Despite the low scattering power of V for neutrons, neutron diffraction was used because N has a large scattering power. Hence, in this experiment the structure was determined solely by the N atom positions. The investigation confirmed that fl-V2N has the e-Fe2N structure, similar to fl-Nb2N and fl-Ta2N.Acknowledgement is made to the Carlsberg Fondet for supplying a spark-erosion machine for the crystalgrowth project.References BACON, G. E. (1972). Acta Cryst. A28, 357-358. BURDESE, A. (1957). Metall. Ital. 49, 195-199. CHRISTENSEN, A. N. (1976

Spectroscopic characterization of chromium (IV, V, VI) in Cr:Li2MSiO4 (M=Mg,Zn)

“…As expected from the Li 2 MSiO 4 (M ϭMg,Zn) structure, 11,26 Cr ions in these materials are found in distorted tetrahedral coordination. Cr:Li 2 ZnSiO 4 contains much more Cr V than Cr:Li 2 MgSiO 4 .…”

“…III͒, which offers the best compromise, as far as size and charge compatibilities are concerned: r(Cr V )ϭ0.45 Å, r(Si IV )ϭ0.26 Å. 26 The charge compensation, which is necessary to accommodate Cr V , could be achieved either by the formation of cation vacancies in the vicinity of the substitution site, or by replacing a Mg 2ϩ ion by Li ϩ . In both cases, this would induce a distortion of the tetrahedral Cr V sites.…”

Conversion of Valence State and Coordination State of Fe in Transparent Glass‐Ceramics ContainingLi2ZnSiO4Nanocrystals

“…These main peaks were indexed to the Li 2 ZnSiO 4 crystals with diffractions at (110), (101), (002), etc. 23 Other AG and GC samples doped with different potassium compounds (K 2 CO 3 /KNO 3 ) or different Fe 2 O 3 concentration (from 0 to 0.28 mol%) show almost the same diffraction patterns as those in Fig. 2.…”

“…The XRD pattern of the GC14‐O sample contains several sharp peaks superimposing on the broad diffraction bands. These main peaks were indexed to the Li 2 ZnSiO 4 crystals with diffractions at (110), (101), (002), etc …”

“…The two samples show similar excitation bands, which can be well assigned to electronic transitions from ground state 6 A 1 ( 6 S) to several excited states of Fe 3+ ions (3d 5 configuration). 33 Meanwhile, according to a crystallographic research by M. Yamaguchi et al, 23 the Li 2 ZnSiO 4 crystalline structure is based on hexagonal packing arrangement of O atoms with layer stacked parallel to (001), and all cations are coordinated tetrahedrally by O atoms (see Fig. 6 and Ref.…”