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The influence of pressure on the crystal structure of LaGaO 3 has been studied using synchrotron x-ray diffraction. At atmospheric pressure LaGaO 3 has an orthorhombic structure in Pnma and undergoes a first-order phase transition to a rhombohedral structure near 2.5 GPa. The transition is reversible and the orthorhombic structure is recovered upon releasing the pressure below 2 GPa.
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Vogt et al. (2001) studied this question.
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