Phase Transitions in 1-Bromoadamantane Compared to 1-Chloroadamantane: Similarities and Unique Features

Physical Chemistry Chemical Physics ◽

10.1039/d1cp03080a ◽

2021 ◽

Author(s):

Igor Vladimirovich Danilov ◽

Elena Leonidovna Gromnitskaya ◽

Vadim Brazhkin

Keyword(s):

Phase Transitions ◽

Elastic Properties ◽

High Pressures ◽

Quasi Order

The elastic properties of 1-Chloroadamantane and 1-Bromoadamantane in order–disorder and order–quasi-order phase transitions at temperatures in the range of 77–305 K and high pressures up to 1.1 GPa are studied...

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PHASE TRANSITIONS AND CRITICAL PHENOMENA IN THE CRYSTAL OF А2IVВ2VС6VI GROUP UNDER HIGH PRESSURES

Scientific Herald of Uzhhorod University Series Physics ◽

10.24144/2415-8038.2000.6.76-93 ◽

2000 ◽

Vol 6 (0) ◽

pp. 76-93

Author(s):

О. І. Герзанич ◽

О. Г. Сливка ◽

П. П. Гуранич ◽

В. С. Шуста ◽

В. М. Кедюлич ◽

...

Keyword(s):

Phase Transitions ◽

Critical Phenomena ◽

High Pressures

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Phase transitions beyond post-perovskite in NaMgF3 to 160 GPa

Proceedings of the National Academy of Sciences ◽

10.1073/pnas.1909446116 ◽

2019 ◽

Vol 116 (39) ◽

pp. 19324-19329 ◽

Cited By ~ 1

Author(s):

Rajkrishna Dutta ◽

Eran Greenberg ◽

Vitali B. Prakapenka ◽

Thomas S. Duffy

Keyword(s):

Phase Transitions ◽

Diamond Anvil Cell ◽

Extrasolar Planets ◽

High Pressures ◽

Model System ◽

Similar Sequence ◽

Deep Interior ◽

Diamond Anvil ◽

Binary Compounds ◽

Pressure Phase

Neighborite, NaMgF3, is used as a model system for understanding phase transitions in ABX3 systems (e.g., MgSiO3) at high pressures. Here we report diamond anvil cell experiments that identify the following phases in NaMgF3 with compression to 162 GPa: NaMgF3 (perovskite) → NaMgF3 (post-perovskite) → NaMgF3 (Sb2S3-type) → NaF (B2-type) + NaMg2F5 (P21/c) → NaF (B2) + MgF2 (cotunnite-type). Our results demonstrate the existence of an Sb2S3-type post-post-perovskite ABX3 phase. We also experimentally demonstrate the formation of the P21/c AB2X5 phase which has been proposed theoretically to be a common high-pressure phase in ABX3 systems. Our study provides an experimental observation of the full sequence of phase transitions from perovskite to post-perovskite to post-post-perovskite followed by 2-stage breakdown to binary compounds. Notably, a similar sequence of transitions is predicted to occur in MgSiO3 at ultrahigh pressures, where it has implications for the mineralogy and dynamics in the deep interior of large, rocky extrasolar planets.

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