The effect of processing conditions on the phase, microstructure and dielectric properties of SrCa4Nb4TiO17 and Ca5Nb4TiO17 microwave ceramics

Manan, A.; Reaney, I. M.

Artykuł - szczegóły

Tytuł artykułu

The effect of processing conditions on the phase, microstructure and dielectric properties of SrCa4Nb4TiO17 and Ca5Nb4TiO17 microwave ceramics

Autorzy

Manan A. , Reaney I. M.

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Abstrakty

The effect of processing conditions on the phase, microstructure and dielectric properties of SrCa4Nb4TiO17 and Ca5Nb4TiO17 microwave ceramics was investigated. The ceramics processed via solid state mixed-oxide route were characterized using XRD, Raman spectroscopy and SEM for phase, molecular vibrational modes and microstructural analysis respectively. Dielectric properties at low and microwave frequencies were measured using LCR meter and a vector network analyzer. The XRD results revealed the formation of a single phase for each ceramics. The microstructure was comprised of elongated and plate-like grains. The optimum microwave dielectric properties i.e. temperature coefficient of resonant frequency (t f ) --78 ppm/K, electric permittivity (er) -47:2 and quality factor multiplied by the resonant frequency (Qu fo) -11954 GHz, were achieved for SrCa4Nb4TiO17, sintered at 1475 °C for 4 h. For Ca5Nb4TiO17, sintered at 1450 °C for 4 h, the respective properties were: t f --137 ppm/K, er - 42 and Qu fo - 14800 GHz respectively.

Słowa kluczowe

SEM perovskites processing dielectric resonators

Wydawca

De Gruyter

Czasopismo

Materials Science Poland

Rocznik

2012

Tom

Vol. 30, No. 2

Strony

98--104

Opis fizyczny

Bibliogr. 34 poz.

Twórcy

autor

Manan A.

autor

Reaney I. M.

Department of Physics, University of Science and Technology Bannu, Postcode 28100, Pakistan

Bibliografia

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