Effect of A-site vacancy order-disorder states on diffuse phase transition of the morphotropic phase boundary Pb1−xBaxNb2O6 ferroelectrics
- 1 September 1996
- journal article
- Published by Springer Science and Business Media LLC in Journal of Materials Research
- Vol. 11 (9), 2302-2308
- https://doi.org/10.1557/jmr.1996.0293
Abstract
The effect of A-site vacancy order-disorder states on diffuse phase transition (DPT) of tungsten bronze Pb1−xBaxNb2O6 (PBN) ferroelectrics has been investigated. The A-site vacancy disordered PBN ceramics exhibit notable variations of the Curie temperatures (i.e., the temperatures at the dielectric maximum permittivities) up to 12 °C in response to frequency changed from 0.1 KHz to 100 KHz. The largest frequency dispersion occurred at the morphotropic phase boundary of 1 − X = 0.63, along with the lowest Curie point. In contrast, the A-site vacancy ordered PBN ceramics present little frequency dispersion in the range of 2 °C from 0.1 KHz to 100 KHz. Dielectric constants of the disordered PBN ceramics were generally higher than those of the ordered ones. In comparison with the ordered PBN ceramics, the Curie points of the disordered ceramics were shifted from lower to higher temperature as the Pb2+ cation percentage was decreased; i.e., the Curie temperatures of the disordered PBN ceramics were lower than those of the ordered ones when 1 − X ≥ 0.70, but higher when 1 − X ≤ 0.65. These differences are suggested to inherently result from the A-site vacancy order-disorder states. The relationship between the A-site vacancy order-disorder states and the dielectric properties has also been confirmed with studies of thermal hysteresis.Keywords
This publication has 16 references indexed in Scilit:
- HREM study of ordered and disordered structures inPb(Sc0.5Ta0.5)O3Materials Letters, 1994
- Microstructure-property relations in tungsten bronze lead barium niobate, Pb1−xBaxNb2O6Journal of Materials Research, 1991
- Ferroelectric and structural properties of the tungsten bronze system K2Ln3+Nb5O15, Ln = La to LuMaterials Research Bulletin, 1990
- Classification and consequences of complex lead perovskite ferroelectrics with regard to B-site cation orderJournal of Materials Research, 1990
- Nanostructural-Property Relations in Complex Lead PerovskitesJapanese Journal of Applied Physics, 1990
- Relaxor ferroelectricsFerroelectrics, 1987
- Glassy polarization behavior in -type ferroelectricsPhysical Review B, 1984
- Order–disorder reactions in the ferroelectric perovskites Pb(Sc1/2Nb1/2)O3 and Pb(Sc1/2Ta1/2)O3. II. Relation between ordering and propertiesphysica status solidi (a), 1980
- X-ray dielectric, and optical study of ferroelectric lead metatantalate and related compoundsActa Crystallographica, 1960
- The relation between structure and ferroelectricity in lead barium and barium strontium niobatesActa Crystallographica, 1960