The novel phase transition of NaBi(WO4)2 under high pressure

The Raman and synchrotron angle-dispersive X-ray diffraction studies have been performed on NaBi(WO4)2 under high pressure up to 30.7 and 36.2GPa, respectively, at room temperature. With pressure increases to ∼7.0GPa, the structure of NaBi(WO4)2 begins to transform from tetragonal (I41/a) into monoc...

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Bibliographic Details
Published in:Journal of solid state chemistry 2013-04, Vol.200, p.246-250
Main Authors: Ma, Chunli, Cui, Hang, Li, Fangfei, Wang, Jingshu, Wu, Xiaoxin, Zhang, Jian, Zhou, Qiang, Liu, Jinghe, Cui, Qiliang
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Diffraction
Exact sciences and technology
High pressure
High-pressure and shock-wave effects in solids and liquids
Lead (metal)
Mechanical and acoustical properties of condensed matter
Molybdates
NaBi(WO4)2
Phase transformations
Phase transition
Physics
Raman scattering
Strontium
Structure of solids and liquids
crystallography
Structure of specific crystalline solids
Synchrotron angle-dispersive X-ray diffraction
Synchrotrons
Tungstates
X-rays
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Summary:The Raman and synchrotron angle-dispersive X-ray diffraction studies have been performed on NaBi(WO4)2 under high pressure up to 30.7 and 36.2GPa, respectively, at room temperature. With pressure increases to ∼7.0GPa, the structure of NaBi(WO4)2 begins to transform from tetragonal (I41/a) into monoclinic (P2/m), and the phase transition completes around 13GPa. With pressure higher than 29.0GPa, the NaBi(WO4)2 turns into amorphous state. The random arrangement of Na+ and Bi3+ in short-range ordered scheelite NaBi(WO4)2 results in the tetragonal to monoclinic phase transition, which is different from that observed in AWO4 tungstates and AMoO4 molybdates (A=Ca, Sr, Ba, Pb, Eu, Cd). The NaBi(WO4)2 transforms from tetragonal into monoclinic, which starts around 7GPa and completes at about 13GPa. With pressure higher than 29GPa, the NaBi(WO4)2 turns into amorphous state. [Display omitted] ► Raman and X-ray diffraction studies performed on NaBi(WO4)2 up to 30.7 and 36.2GPa, respectively. ► The tetragonal (I41/a) into monoclinic (P2/m) phase transition is determined. ► With pressure higher than 29GPa, the NaBi(WO4)2 ultimately turns into amorphous state. ► The ambient pressure bulk modulus and volume of tetragonal and monoclinic phases are obtained.
ISSN:0022-4596
1095-726X
DOI:10.1016/j.jssc.2013.01.049