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Journal of Materials Science

Erschienen in:

01.05.2015 | Original Paper

Structure and microwave dielectric properties of La_5−xSr_xTi_4+xGa_1−xO₁₇ ceramics

verfasst von: Raz Muhammad, Yaseen Iqbal, Ian M. Reaney

Erschienen in: Journal of Materials Science | Ausgabe 9/2015

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Abstract

Single phase polycrystalline ceramics in the La_5−xSr_xTi_4+xGa_1−xO₁₇ (x = 0–1) system with A₅B₅O₁₇ type layered perovskite structure were prepared via a mixed-oxide, solid state sintering route. X-ray diffraction revealed orthorhombic, Pnnm symmetry with Raman spectra consistent with this space group. The sintered ceramics exhibited a plate-like grain structure with a relative density, 94–97.5 %. The end member, La₅Ti₄GaO₁₇ had ε _r = 42.31, Q × f _o = 17,093 GHz, τ _f = −34.53 but τ _f could be tuned close to zero by Sr and Ti substitution at the A- and B-sites, respectively. An optimum composition La_4.5Sr_0.5Ti_4.5Ga_0.5O₁₇ was achieved at x = 0.5 with ε _r = 51, Q × f _o = 15,290 GHz and τ _f = −2.2 ppm/^oC.

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Titel: Structure and microwave dielectric properties of La5−x Sr x Ti4+x Ga1−x O17 ceramics
verfasst von: Raz Muhammad
Yaseen Iqbal
Ian M. Reaney
Publikationsdatum: 01.05.2015
Verlag: Springer US
Erschienen in: Journal of Materials Science / Ausgabe 9/2015
Print ISSN: 0022-2461
Elektronische ISSN: 1573-4803
DOI: https://doi.org/10.1007/s10853-015-8914-3

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