Institut Jožef Stefan, Ljubljana (IJS)
  • Incorporation of bismuth into ▫$Ba_{6-x}R_{8+2/3x}Ti_{18}O_{54}$▫(R=Nd, Gd)
    Valant, Matjaž ; Suvorov, Danilo
    Microstructural investigations and microanalyses of a series of Ba6-xR8+2/3xTi18O54 ceramics (R = Nd, Gd) revealed that the solid-solubility limit for the isovalent substitution of R3+by Bi3+ depends ... on the composition of the Ba6-xR8+2/3xTi18O54 phase. For the Nd analogue the solid-solubility limit (y in Ba6-x(Nd1-yBiy)(8+2/3x)Ti18O54) decreases with a decrease in x from y = 0.16 for x = 2.0 to y = 0.10 for x = 0.8. An even lower solid-solubility limit (y = 0.06) was found for the Ba-4.5(Gd1-yBiy)(9)Ti18O54 compound (x = 1.5). All substituted Nd compositions exhibit higher permittivities (93-99),lower temperature coefficients of permittivity (11-15 ppm/K) and higher dielectric losses (Q . f = 1300-5500 GHz) than the parent compositions. By exceeding the solid-solubility limit, abrupt changes in the microstructuraland dielectric characteristics are induced.
    Vir: Journal of Materials Science. - ISSN 0022-2461 (Vol. 36, 2001, str. 2991-2997)
    Vrsta gradiva - članek, sestavni del
    Leto - 2001
    Jezik - angleški
    COBISS.SI-ID - 16064039

vir: Journal of Materials Science. - ISSN 0022-2461 (Vol. 36, 2001, str. 2991-2997)

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