Synthesis, Structure and Thermal Contraction of a New Low-Temperature Polymorph of ZrMo2O8.

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2003 Equilibria Equilibria E 4000 Synthesis, Structure and Thermal Contraction of a New Low-Temperature Poly- morph of ZrMo 2 O 8 . — The new negative thermal expansion polymorph of the title compound is prepared by heating the precursor ZrMo2O7(OH)2·2H2O at 573 K for 8 h. The pathway from the precursor phase, via the new intermediate polymorph, to the cubic phase is monitored by in situ variable temperature XRD. A possible topotactic mechanism for the formation of the new polymorph from the precursor phase is pro- posed. — (ALLEN, S.; WARMINGHAM, N. R.; GOVER, R. K. B.; EVANS*, J. S. O.; Chem. Mater. 15 (2003) 18, 3406-3410; Dep. Chem., Univ. Durham, Durham DH1 3LE, UK; Eng.) — W. Pewestorf 48- 027

Transcript of Synthesis, Structure and Thermal Contraction of a New Low-Temperature Polymorph of ZrMo2O8.

Page 1: Synthesis, Structure and Thermal Contraction of a New Low-Temperature Polymorph of ZrMo2O8.

2003 Equilibria

200348.fm Page 27 Friday, October 31, 2003 2:17 PM

EquilibriaE 4000 Synthesis, Structure and Thermal Contraction of a New Low-Temperature Poly-

morph of ZrMo2O8. — The new negative thermal expansion polymorph of the title compound is prepared by heating the precursor ZrMo2O7(OH)2·2H2O at 573 K for 8 h. The pathway from the precursor phase, via the new intermediate polymorph, to the cubic phase is monitored by in situ variable temperature XRD. A possible topotactic mechanism for the formation of the new polymorph from the precursor phase is pro-posed. — (ALLEN, S.; WARMINGHAM, N. R.; GOVER, R. K. B.; EVANS*, J. S. O.; Chem. Mater. 15 (2003) 18, 3406-3410; Dep. Chem., Univ. Durham, Durham DH1 3LE, UK; Eng.) — W. Pewestorf

48- 027

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