Synthesis and characterisation of the double perovskite Ba{sub 2}(Zn{sub 0.5}Ti{sub 0.5} X)O{sub 6} (X = Nb, Ta) ceramics
Journal Article
·
· Materials Research Bulletin
- CRISMAT Laboratory, Ceramics Team, 6 BD Marechal Juin, 14050 Caen Cedex (France)
Ba{sub 2}(Zn{sub 0.5}Ti{sub 0.5} X)O{sub 6} compounds from the general ABO{sub 3} perovskite family were synthesized by the classical solid-state route for X = Nb and Ta with various A/B ratios (1.005, 1 and 0.995). After the calcination step at 1100 deg. C, both compounds (X = Nb and Ta) contain mainly the cubic disordered 'Ba{sub 2}(Zn{sub 0.5}Ti{sub 0.5} X)O{sub 6}' phase but traces of BaTiO{sub 3} and secondary phases are often detectable. Nevertheless, after the sintering stage at higher temperature (from 1300 to 1500 deg. C) and for all A/B ratios investigated, Ti enters into the cubic perovskite structure, resulting in the formation of a unique 'Ba{sub 2}(Zn{sub 0.5}Ti{sub 0.5} X)O{sub 6}' phase. Attractive dielectric properties have been measured on the tantalum-based compound for A/B = 0.995 (Q {approx}2000 at 7.4 GHz and {epsilon} = 39.6) as well as on the niobium-based phase for A/B = 1.005 (Q {approx}2200 at 6.1 GHz and {epsilon} = 54.8). All these characteristics were confirmed at 1 MHz and a linear dependence of the permittivity versus temperature from -60 to 180 deg. C has also been evidenced for both formulations. Sinterability, dielectric properties and microstructure of such compounds are discussed with respect to the stoichiometry.
- OSTI ID:
- 20889783
- Journal Information:
- Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 6 Vol. 40; ISSN MRBUAC; ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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