Phase Transition and Negative Thermal Expansion in A2(MoO4)3 System (A: Fe3+, Cr3+ and Al3+).
β Scribed by A. K. Tyagi; S. N. Achary; M. D. Mathews
- Publisher
- John Wiley and Sons
- Year
- 2003
- Weight
- 58 KB
- Volume
- 34
- Category
- Article
- ISSN
- 0931-7597
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β¦ Synopsis
Abstract
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A complete solid solution between relaxor ferroelectric Pb(Fe 2/3 W 1/3 )O 3 (PFW) and ferroelectric PbTiO 3 (PT), (1Ψx)PFW+xPT, was synthesized by a B-site precursor method and characterized by X-ray di4raction, di4erential scanning calorimetry, and dielectric measurements. A phase diagram between
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The structure of tetragonal NbOPO 4 has been studied from room temperature to 500°°C by X-ray powder diffraction and to 327°°C by neutron powder diffraction. Rietveld refinements were conducted on neutron data collected at 25, 100, 175, 200, 225, 275, and 327°°C. A phase transition was found at abou
Phase formation in the Cu 3Ψ1.5x R 4Ψx (VO 4 ) 6 (R β«Ψβ¬ Fe and Cr) systems was studied at 6703C by powder X-ray di4raction. In the Cu 3Ψ1.5x Fe 4Ψx (VO 4 ) 6 system there are two compounds having homogeneity ranges with formula Cu 3Ψ1.5x Fe 4Ψx (VO 4 ) 6 (0.6674 x(0.778) and Cu 3Ψ1.5x Fe 4Ψx (VO 4 )