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Structure, Microstructure, and Microwave Dielectric Properties of (Sr2−xCax)(MgTe)O6 Double Perovskites

Rick Ubic, Boise State University
Steven Letourneau, Boise State University
Sherin Thomas, National Institute for Interdisciplinary Science and Technology (CSIR)
G. Subodh, Univerisität Stuttgart
M. T. Sebastian, National Institute for Interdisciplinary Science and Technology (CSIR)

Abstract

Sr2−xCaxMgTeO6 (0 ≤ x ≤ 2) ceramics were prepared by the solid-state ceramic route. Structure and microstructure of the compounds were investigated using XRD, TEM, and SEM methods. The system undergoes a transition from pseudocubic tetragonal I4/m symmetry for x = 0 (Sr2MgTeO6) to pseudotetragonal monoclinic P21/n symmetry for x > 0. The dielectric properties of the ceramics were studied by the resonance method. The temperature coefficient of resonant frequency is negative throughout the series; permittivities were in the range 13.2−14.3, and quality factors varied from 27500 to 81000 (5−6 GHz).

Suggested Citation

Rick Ubic, Steven Letourneau, Sherin Thomas, G. Subodh, and M. T. Sebastian. "Structure, Microstructure, and Microwave Dielectric Properties of (Sr2−xCax)(MgTe)O6 Double Perovskites" Chemistry of Materials 22.16 (2010): 4572-4578.
Available at: http://works.bepress.com/rick_ubic/47