A reexamination of the crystal structure of erionite

A. Alberti, A. Martucci, E. Galli, G. Vezzalini
{"title":"A reexamination of the crystal structure of erionite","authors":"A. Alberti,&nbsp;A. Martucci,&nbsp;E. Galli,&nbsp;G. Vezzalini","doi":"10.1016/S0144-2449(97)00102-4","DOIUrl":null,"url":null,"abstract":"<div><p>The crystal structure of a natural erionite from Nizhnyaya Tunguska, Siberia (schematic formula K<sub>2</sub>Ca<sub>3.5</sub>Al<sub>9</sub>Si<sub>27</sub>O<sub>72</sub> · 32H<sub>2</sub>O) has been refined to a residual wR of 0.044. The erionite framework can be described by a sequence AABAAC … of 6-membered rings of tetrahedra. The (Si, Al) distribution (24% of Al in T1 and 31% of Al in T2) is consistent with the strong disorder found in tetrahedral sites for all zeolites describable by a sequence of 6-rings. Erionite, as in the closely related zeolite offretite, shows a slight enrichment of Al in the single 6-ring. K is at the center of the cancrinite cage and coordinates 6 framework oxygen atoms. Ca atoms alternately occupy three sites, quite near each other, on the triad axis parallel to <em>c</em>, at the center of the erionite cage. Their coordination number varies between 6 and 9. The marked differences in T—O distances found between hydrated and dehydrated erionite are explained in terms of interactions between extraframework ions and framework oxygens.</p></div>","PeriodicalId":23983,"journal":{"name":"Zeolites","volume":"19 5","pages":"Pages 349-352"},"PeriodicalIF":0.0000,"publicationDate":"1997-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0144-2449(97)00102-4","citationCount":"38","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Zeolites","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0144244997001024","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 38

Abstract

The crystal structure of a natural erionite from Nizhnyaya Tunguska, Siberia (schematic formula K2Ca3.5Al9Si27O72 · 32H2O) has been refined to a residual wR of 0.044. The erionite framework can be described by a sequence AABAAC … of 6-membered rings of tetrahedra. The (Si, Al) distribution (24% of Al in T1 and 31% of Al in T2) is consistent with the strong disorder found in tetrahedral sites for all zeolites describable by a sequence of 6-rings. Erionite, as in the closely related zeolite offretite, shows a slight enrichment of Al in the single 6-ring. K is at the center of the cancrinite cage and coordinates 6 framework oxygen atoms. Ca atoms alternately occupy three sites, quite near each other, on the triad axis parallel to c, at the center of the erionite cage. Their coordination number varies between 6 and 9. The marked differences in T—O distances found between hydrated and dehydrated erionite are explained in terms of interactions between extraframework ions and framework oxygens.

查看原文
分享 分享
微信好友 朋友圈 QQ好友 复制链接
本刊更多论文
黄铁矿晶体结构的再检验
西伯利亚下通古斯天然铁长石的晶体结构(图式K2Ca3.5Al9Si27O72·32H2O)的残差wR为0.044。六元四面体环的结构可以用AABAAC…序列来描述。(Si, Al)的分布(T1中有24%的Al, T2中有31%的Al)与所有沸石在四面体位置上发现的由6环序列描述的强无序一致。与沸石密切相关的铝沸石中,铝沸石在单个6环中表现出轻微的富集。K位于癌质笼的中心,与6个框架氧原子协调。钙原子交替占据三个位置,彼此很近,在平行于c的三轴上,在离子笼的中心。它们的配位数在6到9之间。水合和脱水钙离子之间的T-O距离的显著差异可以用框架外离子和框架氧之间的相互作用来解释。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 去求助
来源期刊
自引率
0.00%
发文量
0
期刊最新文献
Metal-organic Frameworks for Catalysis 19th International Zeolite Conference(IZC’19)参加報告 19th International Zeolite Conference(IZC’19)参加報告 実験化学,計算機化学,データサイエンスの融合による設計的ゼオライト合成 古典的なASFモデルを打破するジェット燃料直接合成用Co/Ymeso-La触媒
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
已复制链接
已复制链接
快去分享给好友吧!
我知道了
×
扫码分享
扫码分享
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1