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Errandonea D, Achary SN, Diaz-Anichtchenko D, Bandiello E, Marqueño T, Shukla R, Tyagi AK, Popescu C, Alabarse FG. Equations of State and Crystal Structures of KCaPO 4, KSrPO 4, and K 2Ce(PO 4) 2 under High Pressure: Discovery of a New Polymorph of KCaPO 4. CRYSTAL GROWTH & DESIGN 2023; 23:2782-2794. [PMID: 37038396 PMCID: PMC10080652 DOI: 10.1021/acs.cgd.2c01547] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/30/2022] [Revised: 02/16/2023] [Indexed: 06/19/2023]
Abstract
We have studied by means of angle-dispersive powder synchrotron X-ray diffraction the structural behavior of KCaPO4, SrKPO4, and K2Ce(PO4)2 under high pressure up to 26, 25, and 22 GPa, respectively. For KCaPO4, we have also accurately determined the crystal structure under ambient conditions, which differs from the structure previously reported. Arguments supporting our structural determination will be discussed. We have found that KCaPO4 undergoes a reversible phase transition. The onset of the transition is at 5.6 GPa. It involves a symmetry decrease. The low-pressure phase is described by space group P3̅m1 and the high-pressure phase by space group Pnma. For KSrPO4 and K2Ce(PO4)2, no evidence of phase transitions has been found up to the highest pressure covered by the experiments. For the three compounds, the linear compressibility for the different crystallographic axes and the pressure-volume equation of states are reported and compared with those of other phosphates. The three studied compounds are among the most compressible phosphates. The results of the study improve the knowledge about the high-pressure behavior of complex phosphates.
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Affiliation(s)
- Daniel Errandonea
- Departamento
de Física Aplicada-ICMUV, MALTA Consolider Team, Universidad de Valencia, Dr. Moliner 50, Burjassot, Valencia 46100, Spain
| | - Srungarpu N. Achary
- Bhabha
Atomic Research Centre, Solid State Chemistry Section, Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| | - Daniel Diaz-Anichtchenko
- Departamento
de Física Aplicada-ICMUV, MALTA Consolider Team, Universidad de Valencia, Dr. Moliner 50, Burjassot, Valencia 46100, Spain
| | - Enrico Bandiello
- Instituto
de Diseño para la Fabricación y Producción Automatizada,
MALTA Consolider Team, Universitat Politècnica
de Valéncia, Valencia 46022, Spain
| | - Tomas Marqueño
- Departamento
de Física Aplicada-ICMUV, MALTA Consolider Team, Universidad de Valencia, Dr. Moliner 50, Burjassot, Valencia 46100, Spain
| | - Rakesh Shukla
- Bhabha
Atomic Research Centre, Solid State Chemistry Section, Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| | - Avesh K. Tyagi
- Bhabha
Atomic Research Centre, Solid State Chemistry Section, Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| | - Catalin Popescu
- CELLS—ALBA
Synchtrotron Light Facility, Cerdanyola
del Valles E-08290, Barcelona, Spain
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