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RESEARCH PRODUCT

New high-pressure phase of HfTiO4 and ZrTiO4 ceramics

O.y. KhyzhunDaniel ErrandoneaDavid Santamaría-pérezTatiana Bondarenko

subject

Equation of stateCondensed Matter - Materials ScienceMaterials scienceMechanical EngineeringMaterials Science (cond-mat.mtrl-sci)FOS: Physical sciencesThermodynamicsCrystal structureCondensed Matter PhysicsPressure rangeCondensed Matter - Other Condensed MatterCrystallographyMechanics of MaterialsPhase (matter)High pressurevisual_artvisual_art.visual_art_mediumCompressibilityGeneral Materials ScienceCeramicOther Condensed Matter (cond-mat.other)Monoclinic crystal system

description

We studied the high-pressure effects on the crystalline structure of monoclinic HfTiO4 and ZrTiO4. We found that the compressibility of these ceramics is highly non-isotropic, being the b-axis the most compressible one. In addition, the a-axis is found to have a small and negative compressibility. At 2.7 GPa (10.7 GPa) we discovered the onset of an structural phase transition in HfTiO4 (ZrTiO4), coexisting the low- and high-pressure phases in a broad pressure range. The new high-pressure phase has a monoclinic structure which involves an increase in the Ti-O coordination and a collapse of the cell volume. The equation of state for the low-pressure phase is also determined.

yearjournalcountryeditionlanguage
2010-08-27
10.1016/j.materresbull.2010.06.061http://arxiv.org/abs/1008.4675