1:2 Cation order in A(Li[sub 1/3](Nb,Ta)[sub 2/3])O[sub 3] microwave perovskites

Borisevich, Albina; Davies, Peter K.
February 2004
Applied Physics Letters;2/23/2004, Vol. 84 Issue 8, p1347
Academic Journal
In a family of perovskites with the general stoichiometry (A[sub 2/3][sup 2+]La[sub 1/3])(B[sub 1/3][sup 1+]B[sub 2/3][sup 5+])O[sub 3], three 1:2 ordered perovskites were prepared with A=Sr, B[sup 1+]=Li, B[sup 5+]=Nb, Ta and with A=Ca, B[sup 1+]=Li, B[sup 5+]=Nb. These compounds can be sintered to high density at temperatures ≤1350 °C, have dielectric constants in the range 25–30, microwave quality factors as high as 26 000, and negative temperature coefficients of resonant frequency. A 1:2 polymorph was not observed for (Ca[sub 2/3]La[sub 1/3])(Li[sub 1/3]Ta[sub 2/3])O[sub 3] which adopted a 1:1 ordered structure. The larger charge difference between the ions involved in the B-site ordering in these systems compared to other 1:2 ordered microwave perovskites such as Ba(Zn[sub 1/3]Nb[sub 2/3])O[sub 3], is reflected by a higher stability of the order which is stable up to their decomposition/melting temperature. © 2004 American Institute of Physics.


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