6533b85ffe1ef96bd12c1076

RESEARCH PRODUCT

Formation of Layers of Diverse Stoichiometric and Phase Composition in Lithium Tantalate Crystals at Treatment by Vapour Transport Equilibration

M. N. PalatnikovV. A. SandlerK. BormanisN. V. SidorovO. B. ShcherbinaI. N. Efremov

subject

Phase transitionMaterials scienceAnalytical chemistrychemistry.chemical_elementCoercivityCondensed Matter PhysicsElectronic Optical and Magnetic Materialschemistry.chemical_compoundchemistryPhase compositionLithium tantalateElectrical measurementsLithiumSurface layerStoichiometry

description

Layers from tens to hundreds of microns thick of a different phase composition and stoichiometry are shown to form in lithium tantalate crystals subjected to treatment by vapor transport equilibration in lithium vapour. The 500 microns thick stoichiometric (Li/Ta ≈ 1) layers have ten times lower values of the coercive field compared with congruent lithium tantalate. As electrical measurements suggest, a new polar structure of phase transition at ∼120°C is possibly formed within a thin (30 μm) surface layer of the lithium tantalate sample after vapour transport equilibration treatment.

yearjournalcountryeditionlanguage
2012-01-01Ferroelectrics
https://doi.org/10.1080/00150193.2012.677698