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Crystal Data for Two Molybdates MIV (MoO4)2 With MIV = Zr, Hf

Published online by Cambridge University Press:  28 October 2013

M. Auray ,
M. Quarton  and
P. Tarte
M. Auray
Affiliation:
Université Pierre et Marie Curie, Laboratoire de Chimie II, Tour 54, 4, Place Jussieu, 75230 Paris Cedex 05, France
M. Quarton
Affiliation:
Université Pierre et Marie Curie, Laboratorie de Chimie Minérals, CNRS-CRL85, Tour 54, 4, Place Jussieu, 75230 Paris Cedex 05, France
P. Tarte
Affiliation:
Université de Liêge, Institut de Chimie, B-4000 Sart-Tilman par Liêge 1, Belgium
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Abstract

Two molybdates MIV (MoO4)2 (with MIV = Hf or Zr) were synthesized by solid state reaction between MIVO2 and MoO3. Zirconium molybdate undergoes a reversible phase transition at 952 K.

Hf(MoO4)2 and H.T. Zr(MoQ4)2, obtained as single crystals, are trigonal, space group with Z = 6; the cell dimensions are respectively a = 10.1005(3), c = 11.7230(5)Å; V = 1035.76(11)Å3; Dm(298 K) = 4.78(4), Dx = 4.792 Mg m−3 and a = 10.1409(3), c = 11.7097(5)Å; V = 1042.88(11)Å3; Dm (298 K) = 3.91(4), Dx = 3.926 Mg m−3.

L.T. Zr(MoO4)2, indexed by the Visser automatic indexing program (1969) was found to be monoclinic, possible space group P2, P21 or Pm with Z = 4; the cell dimensions are a = 9.7557(5), b = 7.9373(5), c = 7.4631(4)Å, β = 97.959°(5); V = 572.3(5)Å Dm(298 K) = 4.74(5), Dx = 4.770 Mg m−3. Powder diffraction data were obtained at 293 K on a counter diffractometer with Ni-filtered copper radiation ( = 1.5418 Å).

Type
Research Article
Information
Powder Diffraction , Volume 2 , Issue 1 , March 1987 , pp. 36 - 38
Copyright
Copyright © Cambridge University Press 1987

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References

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