Structure and vibrational properties of tetragonal scheelite NaBi(MoO4)2

Hanuza, J.; Haznar, A.; Mączka, M.; Pietraszko, A.; Lemiec, A.; Maas, J.H. van der; Lutz, E.T.G.

doi:10.1002/(sici)1097-4555(199712)28:12<953::aid-jrs190>3.0.co;2-n

Cited by 53 publications

(22 citation statements)

References 4 publications

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“…1 The bands at 193 and 208 cm 1 can be assigned to translational modes (Ca-O) and the 193 cm 1 band possibly also as a translational mode of the WO 4 group. 1,6 The band at 927 cm 1 can be interpreted as the symmetric (WO 4 ) similar to the bands observed at 931 cm 1 observed by Daturi et al 1 and 928 cm 1 by Hanuza et al 6 However, Hanuza et al reported a different assignment and interpreted this band as a combination band without further explanation. 6 Wulfenite has a structure comparable to that of scheelite with the W being replaced by the slightly smaller Mo and the Ca being replaced by Pb.…”

Section: The Mineral Chillagitesupporting

confidence: 75%

Raman spectroscopy of the molybdate minerals chillagite (tungsteinian wulfenite‐I4), stolzite, scheelite, wolframite and wulfenite

Crane

Frost

Williams

et al. 2002

J Raman Spectroscopy

107

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Raman spectra of chillagite, wulfenite, stolzite, scheelite and wolframite were obtained at 298 and 77 K using a Raman microprobe in combination with a thermal stage. Chillagite is a solid solution of wulfenite and stolzite. The spectra of these molybdate minerals are orientation dependent. The band at 695 cm −1 is interpreted as an antisymmetric bridging mode associated with the tungstate chain. The bands at 790 and 881 cm −1 are associated with the antisymmetric and symmetric A g modes of terminal WO 2 whereas the origin of the 806 cm −1 band remains unclear. The n 4 .E g / band was absent for scheelite. The bands at 353 and 401 cm −1 are assigned as either deformation modes or as r(B g ) and d.A g / modes of terminal WO 2 . The band at 462cm −1 has an equivalent band in the infrared at 455 cm −1 assigned as d as .A u / of the .W 2 O 4 / n chain. The band at 508 cm −1 is assigned as n sym .B g / of the .W 2 O 4 / n chain.

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Section: The Mineral Chillagitesupporting

confidence: 75%

Raman spectroscopy of the molybdate minerals chillagite (tungsteinian wulfenite‐I4), stolzite, scheelite, wolframite and wulfenite

Crane

Frost

Williams

et al. 2002

J Raman Spectroscopy

107

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“…12 The structure is ideally suited for the formation of solid solutions, as it exhibits significant compositional flexibility. 3 When trivalent ions are substituted for the divalent Ca 2+ ion charge compensation has been found to proceed via coupled substitution with monovalent cations, 10,13,14 e.g. alkali metal ions.…”

Section: Introductionmentioning

confidence: 99%

Characterization of powellite-based solid solutions by site-selective time resolved laser fluorescence spectroscopy

et al. 2013

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We present a comprehensive study of the solid solution system Ca 2 (MoO 4 ) 2 -NaGd(MoO 4 ) 2 on the molecular scale, by means of site-selective time resolved laser fluorescence spectroscopy (TRLFS). Eu 3+ is used as a trace fluorescent probe, homogeneously substituting for Gd 3+ in the solid solution crystal structure. Site-selective TRLFS of a series of polycrystalline samples covering the whole composition range of the solid solution series from 10% substitution of Ca 2+ to the NaGd end-member reveals it to be homogeneous throughout the whole range. The trivalent ions are incorporated into the powellite structure in only one coordination environment, which exhibits a very strong ligand-metal interaction. Polarizationdependent measurements of a single crystal of NaGd(Eu)(MoO 4 ) 2 identify the coordination geometry to be of C 2v point symmetry. The S 4 symmetry of the Ca site within the powellite lattice can be transformed into C 2v assuming minor motion in the first coordination sphere.

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“…Earlier studies on the basis of powder neutron and Xray diffraction data for NaBi(MoO 4 ) 2 [10] and NaBi (WO4) 2 [10,11] reported either Scheelite-like structure with space group I4 1 =a or slightly distorted Scheelite structure with space group I4 [12,13]. From our most recent examination of NaBi(WO 4 ) 2 , however, it is clear that the exact crystal symmetry is I4 1 =a [14] and the previously observed symmetry lowering possibly is due to non-stoichiometry.…”

Section: Introductionmentioning

confidence: 99%

Low-temperature and high-pressure structural behaviour of NaBi(MoO4)2—an X-ray diffraction study

Waśkowska

Gerward

Olsen

et al. 2005

Journal of Solid State Chemistry

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Structure and vibrational properties of tetragonal scheelite NaBi(MoO4)2

Cited by 53 publications

References 4 publications

Raman spectroscopy of the molybdate minerals chillagite (tungsteinian wulfenite‐I4), stolzite, scheelite, wolframite and wulfenite

Raman spectroscopy of the molybdate minerals chillagite (tungsteinian wulfenite‐I4), stolzite, scheelite, wolframite and wulfenite

Characterization of powellite-based solid solutions by site-selective time resolved laser fluorescence spectroscopy

Low-temperature and high-pressure structural behaviour of NaBi(MoO4)2—an X-ray diffraction study

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