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DOI | 10.1073/pnas.1909446116 |
Phase transitions beyond post-perovskite in NaMgF3 to 160 GPa | |
Rajkrishna Dutta; Eran Greenberg; Vitali B. Prakapenka; and Thomas S. Duffy | |
2019 | |
发表期刊 | Proceedings of the National Academy of Sciences of the United States of America |
ISSN | 0027-8476 |
出版年 | 2019 |
卷号 | 116期号:39页码:19324-19329 |
语种 | 英语 |
英文摘要 | AbstractNeighborite, 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. |
英文关键词 | post-post-perovskite high pressure analog |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/232537 |
专题 | 地球科学 资源环境科学 气候变化 |
推荐引用方式 GB/T 7714 | Rajkrishna Dutta,Eran Greenberg,Vitali B. Prakapenka,et al. Phase transitions beyond post-perovskite in NaMgF3 to 160 GPa[J]. Proceedings of the National Academy of Sciences of the United States of America,2019,116(39):19324-19329. |
APA | Rajkrishna Dutta,Eran Greenberg,Vitali B. Prakapenka,&and Thomas S. Duffy.(2019).Phase transitions beyond post-perovskite in NaMgF3 to 160 GPa.Proceedings of the National Academy of Sciences of the United States of America,116(39),19324-19329. |
MLA | Rajkrishna Dutta,et al."Phase transitions beyond post-perovskite in NaMgF3 to 160 GPa".Proceedings of the National Academy of Sciences of the United States of America 116.39(2019):19324-19329. |
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