Journal
JOURNAL OF SOLID STATE CHEMISTRY
Volume 182, Issue 7, Pages 1666-1672Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2009.03.004
Keywords
LTCC; Synthetic feldspar; Rietveld structure refinement; Phase transition
Funding
- Slovene human resources development and scholarship fund
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The KxBa1-xGa2-xGe2+xO8 (x = 0.6-1.0) solid solutions undergo a structural phase transition that has a significant effect on their sintering behavior and their microwave dielectric properties. The crystal structures of both phases within the solid-solution region were determined by the Rietveld method using powder X-ray diffraction data. We found that the low-temperature-stable phase is isostructural with the pseudo-orthorhombic KGaGe3O8 (space group P2(1)/a). while the high-temperature-stable phase has a typical monoclinic feldspar structure (space group C-2/m). Due to the topological differences between the two Structures, the T-O bonds within the tetrahedra must be partially recombined to make a new framework, which Causes an endothermic effect during the P2(1)/a to C2/m phase transition. The correlation between the crystal structures, the microwave dielectric properties and the phase-transition behaviors were discussed in terms of the crystallographic features, the lattice parameters, and the strain-induced anisotropic peak-broadening. (C) 2009 Elsevier Inc. All rights reserved.
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