Phase transformations and indications for acoustic mode softening in Tb-Gd orthophosphate

Tschauner, Oliver; Ushakov, Sergey V.; Navrotsky, Alexandra; Boatner, Lynn A.

doi:10.1088/0953-8984/28/3/035403

Title: Phase transformations and indications for acoustic mode softening in Tb-Gd orthophosphate

Journal Article · Wed Jan 06 00:00:00 EST 2016 · Journal of Physics. Condensed Matter

DOI:https://doi.org/10.1088/0953-8984/28/3/035403· OSTI ID:1265508

Tschauner, Oliver ^[1]; Ushakov, Sergey V. ^[2]; Navrotsky, Alexandra ^[2]; Boatner, Lynn A. ^[3]

Univ. of Nevada, Las Vegas, NV (United States). Dept. of Geoscience and High Pressure Science and Engineering Center
Univ. of California, Davis, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division

At ambient conditions the anhydrous rare-earth orthophosphates assume either the xenotime (zircon) or the monazite structure, with the latter favored for the heavier rare earths. Tb_0.5Gd_0.5PO₄ assumes the xenotime structure at ambient conditions but is at the border between the xenotime and monazite structures. Here we show that, at high pressure, Tb_0.5Gd_0.5PO₄ does not transform directly to monazite but through an intermediate anhydrite-type structure. We show softening of (c₁₁₃₃ + c₁₃₁₃) combined elastic moduli close to the transition from the anhydrite to the monazite structure. Stress response of rare-earth orthophosphate ceramics can be affected by both formation of the anhydrite-type phase and the elastic softening in the vicinity of the monazite-phase. In conclusion, we report the first structural data for an anhydrite-type rare earth orthophosphate.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Advanced Research Projects Agency - Energy (ARPA-E)

Grant/Contract Number:: AC05-00OR22725; NA0001982; DESC0005278

OSTI ID:: 1265508

Alternate ID(s):: OSTI ID: 1238942

Journal Information:: Journal of Physics. Condensed Matter, Vol. 28, Issue 3; ISSN 0953-8984

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 14 works

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High-pressure phase of ${LaPO}_{4}$ studied by x-ray diffraction and second harmonic generation Ruiz-Fuertes, J.; Hirsch, A.; Friedrich, A. Physical Review B, Vol. 94, Issue 13 https://doi.org/10.1103/physrevb.94.134109	journal	October 2016
A Spectroscopic Investigation of Eu3+ Incorporation in LnPO4 (Ln = Tb, Gd1-xLux, X = 0.3, 0.5, 0.7, 1) Ceramics Lösch, Henry; Hirsch, Antje; Holthausen, Jacqueline RWTH Aachen University https://doi.org/10.18154/rwth-2019-02413	text	January 2019
A Spectroscopic Investigation of Eu3+ Incorporation in LnPO4 (Ln = Tb, Gd1-xLux, X = 0.3, 0.5, 0.7, 1) Ceramics Lösch, Henry; Hirsch, Antje; Holthausen, Jacqueline Frontiers in Chemistry, Vol. 7 https://doi.org/10.3389/fchem.2019.00094	journal	February 2019

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Title: Phase transformations and indications for acoustic mode softening in Tb-Gd orthophosphate

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