High Pressure Behavior of Incommensurately Modulated Nyerereite Structure | Sciact - CRIS-система Института катализа

High Pressure Behavior of Incommensurately Modulated Nyerereite Structure Научная публикация

Журнал

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

Вых. Данные

Год: 2024, DOI: 10.1080/08957959.2024.2444685

Ключевые слова

Nyerereite; incommensurately modulated structure; high pressure

Авторы

Bogdanov N. ¹ , Rashchenko S. ¹ , Gavryushkin P. ¹ , Thomas V. ¹ , Fursenko D. ¹

Организации

1	Sobolev Institute of Geology and Mineralogy SB RAS, Novosibirsk, Russia

A nyerereite is a carbonate mineral with chemical composition (Na,K)2Ca(CO3)2 and incommensurately modulated crystal structure. Its structure can be described using (3 + 1)-dimensional superspace group Cmcm(α00)00s with modulation vector q = 0.374(1)a*. Here we present the high pressure study of a synthetic nyerereite up to 8.2 GPa, based on single-crystal X-ray diffraction data. The value of modulation vector q is independent of applied pressure and retains a value of about 0.374a*. The present investigation shows no significant changes in modulation parameters of all atomic sites in the studied pressure range. The third-order Birch–Murnaghan equation of state was used to fit PV data with V0 = 559.2(8) Å3, K0 = 30.0(11) GPa, ′ 0 = 6.4(5); the value of bulk modulus is significantly lower than for other known carbonates with a similar composition, which also manifests itself in relatively low values of mode Gruneisen parameters.

Bogdanov N. , Rashchenko S. , Gavryushkin P. , Thomas V. , Fursenko D.
High Pressure Behavior of Incommensurately Modulated Nyerereite Structure
High Pressure Research. 2024. DOI: 10.1080/08957959.2024.2444685

Поступила в редакцию:	28 авг. 2024 г.
Принята к публикации:	16 дек. 2024 г.
Опубликована online:	27 дек. 2024 г.

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