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Anomalous vibrational properties and spin phase diagrams of (Mg,Fe)CO3 under extreme conditionsстатья
Информация о цитировании статьи получена из
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 31 июля 2024 г.
- Авторы: Chaoshuai Zhao, Zhu Mao, Spivak Anna, Xinyue Zhang, Yingxin Yu, Li Luo, Tingting Xiao, Li Wancai, Jin Liu
- Журнал: Physical Review B
- Том: 109
- Номер: 22
- Год издания: 2024
- Издательство: American Physical Society
- Местоположение издательства: United States
- Номер статьи: 224110
- DOI: 10.1103/physrevb.109.224110
- Аннотация: (Mg,Fe)CO3 solid solutions not only play a crucial role in carbon storage and transport within the deep mantle, but also serve as a great case for studying the spin transition behavior of Fe2+ in the fairly isometric sixfold coordinated octahedral sites. However, simultaneously high temperature and pressure measurements on the spin crossover of (Mg,Fe)CO3 remain scarce, which greatly limits our knowledge about the pressure-induced spin transition of (Mg,Fe)CO3 under extreme conditions. In this study, we investigated three representative synthesized (Mg,Fe)CO3 samples at high temperatures and pressures up to 65 GPa and 900 K using Raman spectroscopy coupled with diamond-anvil cells using neon (Ne) as a pressure-transmitting medium. Interestingly, (Mg,Fe)CO3 exhibits abnormal vibrational properties and spin phase diagrams at high temperatures and pressures. The onset of spin crossover for the three (Mg,Fe)CO3 samples decreases with increasing temperatures from 300 to 500 K, followed by an inverse increase at higher temperatures. Moreover, the width of spin crossover is ∼7−9 GPa at 800 K, compared to 3–4 GPa at 300 K. Notably, iron-rich (Mg,Fe)CO3 displays a narrower width of spin crossover than its iron-poor counterpart. These findings provide insights into the effects of temperature and iron concentration on the pressure-induced spin transition of (Mg,Fe)CO3.
- Добавил в систему: Спивак Анна Валерьевна