TY - JOUR
T1 - Thermal expansion and phase transformation in the rare earth di-titanate (R2Ti2O7) system
AU - Hulbert, Benjamin S.
AU - McCormack, Scott J.
AU - Tseng, Kuo Pin
AU - Kriven, Waltraud M.
N1 - Funding Information:
The following funding is acknowledged: Air Force Office of Scientific Research (grant No. FA9550-15-1-0107 to Waltraud M. Kriven); National Science Foundation, Division of Materials Research (grant No. 1838595 to Waltraud M. Kriven). This research was carried out in part in the Frederick Seitz Materials Research Laboratory Central Facilities at the University of Illinois at Urbana-Champaign. Use of the Advanced Photon Source was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357 and was completed at beamline 33 BM-C. This research used resources of beamline 28 ID-2 at the National Synchrotron Light Source II, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Brookhaven National Laboratory under Contract No. DESC0012704. A portion of this research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory.
Funding Information:
The following funding is acknowledged: Air Force Office of Scientific Research (grant No. FA9550-15-1-0107 to Waltraud M. Kriven); National Science Foundation, Division of Materials Research (grant No. 1838595 to Waltraud M. Kriven). This research was carried out in part in the Frederick Seitz Materials Research Laboratory Central Facilities at the University of Illinois at Urbana-Champaign. Use of the Advanced Photon Source was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357 and was completed at beamline 33 BM-C. This research used resources of beamline 28 ID-2 at the National Synchrotron Light Source II, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Broo-khaven National Laboratory under Contract No. DESC0012704. A portion of this research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory.
Publisher Copyright:
© 2021 International Union of Crystallography. All rights reserved.
PY - 2021/6/1
Y1 - 2021/6/1
N2 - 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).
AB - 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).
KW - High-temperature
KW - LaTiO
KW - Neutron diffraction
KW - Phase transition
KW - Rare earth di-titanate
KW - Thermal expansion
KW - X-ray diffraction
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U2 - 10.1107/S2052520621004479
DO - 10.1107/S2052520621004479
M3 - Review article
C2 - 34096522
AN - SCOPUS:85107700464
VL - 77
SP - 307
EP - 308
JO - Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials
JF - Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials
SN - 2052-5192
ER -