Low temperature dielectric characterization of Mg-doped SrTiO3 thin films prepared by sol-gel

resumo

Voltage dependence of dielectric constant epsilon(') of ferroelectrics and low dielectric loss tan delta of incipient ferroelectrics make them attractive for tuning elements in microwave circuits. In this letter, field dependence of the low-temperature dielectric permittivity and polarization of Mg-doped SrTiO3 films is studied. Incorporation of Mg on both Sr and Ti sites decreases the epsilon(') and relative tunability n(r) of sol-gel derived SrTiO3 films, whereas polarization is reduced by Ti site substitution only. tan delta of the studied films is < 0.012, decreasing at low temperatures down to 0.001 when Ti is substituted by 5% of Mg.

palavras-chave

STRONTIUM-TITANATE; MICROWAVE DEVICES; FERROELECTRICS; IMPURITIES; BEHAVIOR

categoria

Physics

autores

Okhay, O; Wu, AY; Vilarinho, PM; Tkach, A

nossos autores

agradecimentos

FCT, CICECO, and FAME Network are acknowledged for financial support.

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