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Erschienen in:
01.03.2015
Structural phase transition and microwave dielectric properties of Ca1−x Sr x TiO3 (x = 0.1–0.9) ceramics
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 3/2015
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Abstract
Single phase Ca1−xSrxTiO3 (x = 0.1, 0.25, 0.5, 0.75 and 0.9) bulk ceramics samples were prepared through a mixed oxide solid state sintering route. All the samples were characterized using synchrotron X-ray diffraction, Raman spectroscopy, scanning electron microscopy and vector network analyzer. Structural analysis revealed structural phase transition from orthorhombic (Pbnm) to tetragonal (I4/mcm) at x > 0.5, consistent with the present Raman spectroscopy results. There was no evidence of orthorhombic Bmmb symmetry in the range x = 0.1–0.9. Relative permittivity varied from 148 to 241, quality factor from 7,427 to 1,487 GHz and temperature coefficient of resonance frequency from +320 to +479 ppm/°C with an increase in x from 0.1 to 0.9.