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High-Pressure Phase Transformations in TiPO₄ : A Route to Pentacoordinated Phosphorus

Title data

Bykov, Maxim ; Bykova, Elena ; Hanfland, Michael ; Liermann, Hanns-Peter ; Kremer, Reinhard K. ; Glaum, Robert ; Dubrovinsky, Leonid ; van Smaalen, Sander:
High-Pressure Phase Transformations in TiPO₄ : A Route to Pentacoordinated Phosphorus.
In: Angewandte Chemie International Edition. Vol. 55 (November 2016) Issue 48 . - pp. 15053-15057.
ISSN 1521-3773
DOI: https://doi.org/10.1002/anie.201608530

Project information

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

Titanium(III) phosphate, TiPO₄, is a typical example of an oxyphosphorus compound containing covalent P−O bonds. Single-crystal X-ray diffraction studies of TiPO₄ reveal complex and unexpected structural and chemical behavior as a function of pressure at room temperature. A series of phase transitions lead to the high-pressure phase V, which is stable above 46 GPa and features an unusual oxygen coordination of the phosphorus atoms. TiPO₄-V is the first inorganic phosphorus-containing compound that exhibits fivefold coordination with oxygen. Up to the highest studied pressure of 56 GPa, TiPO₄-V coexists with TiPO4-IV, which is less dense and might be kinetically stabilized. Above a pressure of about 6 GPa, TiPO₄-II is found to be an incommensurately modulated phase whereas a lock-in transition at about 7 GPa leads to TiPO4-III with a fourfold superstructure compared to the structure of TiPO₄-I at ambient conditions. TiPO₄-II and TiPO₄-III are similar to the corresponding low-temperature incommensurate and commensurate magnetic phases and reflect the strong pressure dependence of the spin-Peierls interactions.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: high-pressure chemistry; phase transitions; phosphorus; spin-Peierls compounds; X-ray diffractio;
Institutions of the University: Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences
Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences > Chair Crystallography
Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences > Chair Crystallography > Chair Crystallography - Univ.-Prof. Dr. Sander van Smaalen
Profile Fields > Advanced Fields > Advanced Materials
Profile Fields
Profile Fields > Advanced Fields
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 500 Natural sciences
500 Science > 530 Physics
Date Deposited: 01 Dec 2016 09:38
Last Modified: 24 Feb 2017 09:28
URI: https://eref.uni-bayreuth.de/id/eprint/35387