Improved microwave dielectric properties of (Mg1-(x+y)CaxLay)(Ti1-yAly)O3 ceramics

Kutty, T. R. N.; Jayanthi, S.
March 2005
Applied Physics Letters;3/21/2005, Vol. 86 Issue 12, p122902
Academic Journal
Phase-singular solids of the composition, (Mg1-(x+y)CaxLay)(Ti1-yAly)O3 (x=0 to 0.88; y=0.05 to 0.35) having the cubic perovskite-type structure were prepared by the substitution of La3+ and Al3+ in equivalent quantities which brought about complete miscibility between MgTiO3 and CaTiO3. These ceramics showed relative permittivities of 16.5 to 50 (at 6 GHz) with increasing Ca content, high Q values of 10 000 to 30 000 and retained near-zero temperature coefficients in permittivity at optimum y values. Their dielectric characteristics are better accountable in terms of the positional disorder rather than the tolerance factor of perovskite structure.


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