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RESEARCH PRODUCT
Structure and dielectric properties of Na<inf>1/2</inf>Bi<inf>1/2</inf>TiO<inf>3</inf>-BaTiO<inf>3</inf> solid solutions
Maija AntonovaAndris SternbergM. DunceA. PlaudeEriks BirksR. Ignatanssubject
PermittivityTetragonal crystal systemPhase transitionPhase boundaryMaterials scienceFerroelectric ceramicsAnalytical chemistryMineralogyDielectricPhase diagramSolid solutiondescription
Dielectric properties, polarization and x-ray diffraction are studied for (1−x)Na 1/2 Bi 1/2 TiO 3 -xBaTiO 3 solid solutions in a concentration range above the morphotropic phase boundary. It is showed that all the studied compositions have tetragonal structure with maximal tetragonality slightly above the morphotropic phase boundary. Ferroelectric relaxor behavior is observed in a wide concentration range of BaTiO 3 . Stability of the relaxor state decreases with increasing BaTiO 3 concentration, but only for compositions with low Na 1/2 Bi 1/2 TiO 3 content the normal ferroelectric-paraelectric phase transition, which is characteristic to pure BaTiO 3 , occurs. Mechanisms, which influence the change of the phase transition character and promote the appearance of the relaxor state, are discussed. The phase diagram of (1−x)Na 1/2 Bi 1/2 TiO 3 -xBaTiO 3 is revised.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2012-07-01 | Proceedings of ISAF-ECAPD-PFM 2012 |