authors |
Ferdov, S; Lin, Z |
nationality |
International |
journal |
JOURNAL OF SOLID STATE CHEMISTRY |
author keywords |
Hafnium garnet; Hydrogarnet; Hydrothermal synthesis; Nanoparticles; Disorder; Hydroxyl inclusion; Crystal structure |
keywords |
POWDER PATTERN DECOMPOSITION; ZIRCONIUM GERMANATE; X-RAY; LUMINESCENCE; CHEMISTRY; SPECTRA; PROGRAM; WATER |
abstract |
Sodium hafnium germanate, Na3Hf1.7Ge3O10(OH)(1.8), with garnet-type of structure was synthesized as a single phase, nanoparticles (100-600 nm) at mild hydrothermal conditions (230 degrees C) and autogenous pressure. The structure was solved ab initio from powder X-ray diffraction data and subsequently refined [R-exp: 6.10, R-wp: 7.26, R-p: 5.39, GOF: 1.19, R-B: 1.50] by the method of Rietveld. The solid crystallizes in cubic space group Ia-3d (230), with a = 12.6819(2) angstrom, V = 2039 .65(1) angstrom(3) and Z = 8. The structure is built up of rare combination of two tetravalent (Ge4+ and Hf4+) and one monovalent (Na+) cation alternating in form corner-sharing GeO4 tetrahedra and HfO6 octahedra whose negative charge is compensated by Na+ residing in dodecahedral coordination. Unlike the typical tetrahedral site disorder in hydrogarnets (hydrogrossular, hibschite, and katoite) we found that the octahedral position of the heavy Hf4+ cation is partly vacant which reveals alternative mechanism of charge unbalance leading to incorporation of hydroxyl group. Furthermore, the synthesized material is the first hafnium germanate with garnet-type of structure and the second known sodium hafnium germanate. |
publisher |
ACADEMIC PRESS INC ELSEVIER SCIENCE |
issn |
0022-4596 |
isbn |
1095-726X |
year published |
2019 |
volume |
273 |
beginning page |
117 |
ending page |
121 |
digital object identifier (doi) |
10.1016/j.jssc.2019.02.031 |
web of science category |
Chemistry, Inorganic & Nuclear; Chemistry, Physical |
subject category |
Chemistry |
unique article identifier |
WOS:000466261100018
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ciceco authors
impact metrics
journal analysis (jcr 2019):
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journal impact factor |
2.726 |
5 year journal impact factor |
2.31 |
category normalized journal impact factor percentile |
57.484 |
dimensions (citation analysis):
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altmetrics (social interaction):
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