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Polymorph stability and phase transitions of trigonal Al<sub>1-</sub> <sub> <i>x</i> </sub>Ga<sub> <i>x</i> </sub>PO<sub>4</sub> mixed crystals
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2001
Year
Crystal StructurePhase TransitionsEngineeringCrystal Growth TechnologySolid-state ChemistryChemistryQuantum MaterialsPolymorph StabilityCalcium AluminateHigh Temperature GeochemistryCrystal FormationAbstract Single CrystalsMaterials ScienceCrystal MaterialCrystallographyCrystal Structure DesignMicrostructureApplied PhysicsCondensed Matter PhysicsSegregation EffectsCrystalsVarious Mole Fractions
Abstract Single crystals of Al 1- x Ga x PO 4 of various mole fractions x were grown from phosphoric acid solutions under hydrothermal conditions using the slow-heating method. In order to relate the parameters of this low-quartz structure analogue and the observed phase transitions to the respective mole fraction, the crystals were investigated by means of electron probe microanalysis, X-ray powder diffraction and differential thermal analysis. The results are discussed in terms of the segregation effects occuring during growth. The limiting geometrical parameters for the existence of the high-quartz phase are compared to the values given in the literature.