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Published in

International Union of Crystallography, Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials, 3(77), p. 397-407, 2021

DOI: 10.1107/s2052520621004479

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Thermal expansion and phase transformation in the rare earth di-titanate (R<sub>2</sub>Ti<sub>2</sub>O<sub>7</sub>) system

This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Abstract

Characterization of the thermal expansion in the rare earth di-titanates is important for their use in high-temperature structural and dielectric applications. Powder samples of the rare earth di-titanatesR2Ti2O7(orR2O3·2TiO2), whereR= La, Pr, Nd, Sm, Gd, Dy, Er, Yb, Y, which crystallize in either the monoclinic or cubic phases, were synthesized for the first time by the solution-based steric entrapment method. The three-dimensional thermal expansions of these polycrystalline powder samples were measured byin situsynchrotron powder diffraction from 25°C to 1600°C in air, nearly 600°C higher than otherin situthermal expansion studies. The high temperatures in synchrotron experiments were achieved with a quadrupole lamp furnace. Neutron powder diffraction measured the monoclinic phases from 25°C to 1150°C. The La2Ti2O7member of the rare earth di-titanates undergoes a monoclinic to orthorhombic displacive transition on heating, as shown by synchrotron diffraction in air at 885°C (864°C–904°C) and neutron diffraction at 874°C (841°C–894°C).