Single-crystal X-ray Diffraction Study of the Incommensurately Modulated Structure of Flamite under High Pressure | Sciact - CRIS-system of Boreskov Institute of Catalysis

Single-crystal X-ray Diffraction Study of the Incommensurately Modulated Structure of Flamite under High Pressure Full article

Journal

High Pressure Research
ISSN: 0895-7959 , E-ISSN: 1477-2299

Output data

Year: 2025, Volume: 45, Number: 3, Pages: 256-268 Pages count : 13 DOI: 10.1080/08957959.2025.2545257

Tags

X-ray diffraction; high pressure; incommensurate modulation; lock-in transition; flamite

Authors

Ignatov Mark A. ^1,2 , Rashchenko Sergey V. ^1,2 , Bogdanov Nikita E. ¹ , Romanenko Alexandr V. ¹ , Sokol Ella V. ¹ , Kokh Svetlana N. ¹

Affiliations

1	Sobolev Institute of Geology and Mineralogy Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russia
2	Department of Geology and Geophysics, Novosibirsk State University, Novosibirsk, Russia

The influence of pressure on the incommensurately modulated structures has been poorly studied to date, particularly on the structures modulated at ambient conditions. Among them is the structure of natural flamite with the general formula (Ca,K,Na)2(Si, P)O4. The behavior of the incommensurately modulated structure of flamite was studied by single-crystal X-ray diffraction in a diamond-anvil cell up to 5 GPa. The modulation vector of flamite remains constant in the investigated pressure range. In the range up to 2–3 GPa, the atomic modulation parameters in the flamite structure are not sensitive to applied pressure, but at higher pressures, amplitudes of the atomic modulation functions increase. The PV-curve of flamite was fitted with the second-order Birch–Murnaghan equation of state: V0 = 350.8(7) Å3 , K0 = 85(9) GPa

Ignatov M.A. , Rashchenko S.V. , Bogdanov N.E. , Romanenko A.V. , Sokol E.V. , Kokh S.N.
Single-crystal X-ray Diffraction Study of the Incommensurately Modulated Structure of Flamite under High Pressure
High Pressure Research. 2025. V.45. N3. P.256-268. DOI: 10.1080/08957959.2025.2545257 WOS Scopus OpenAlex

Submitted:	Jan 9, 2025
Published print:	Jul 3, 2025
Accepted:	Aug 4, 2025
Published online:	Aug 25, 2025

Web of science:	WOS:001552195400001
Scopus:	2-s2.0-105013589877
OpenAlex:	W4413281498

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