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- Title
Thermal expansion and phase transformation in the rare earth di‐titanate (R<sub>2</sub>Ti<sub>2</sub>O<sub>7</sub>) system.
- Authors
Hulbert, Benjamin S.; McCormack, Scott J.; Tseng, Kuo-Pin; Kriven, Waltraud M.
- 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‐titanates R2Ti2O7 (or R2O3·2TiO2), where R = 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 by in situ synchrotron powder diffraction from 25°C to 1600°C in air, nearly 600°C higher than other in situ thermal 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 La2Ti2O7 member 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).
- Subjects
RARE earth metals; THERMAL expansion; PHASE transitions; NEUTRON diffraction; HIGH temperatures; SYNCHROTRONS
- Publication
Acta Crystallographica Section B: Structural Science, Crystal Engineering & Materials, 2021, Vol 77, Issue 3, p397
- ISSN
2052-5192
- Publication type
Article
- DOI
10.1107/S2052520621004479