干旱区生态环境知识资源中心(Arid): Natural bentoriteCr(3+) derivate of ettringite: determination of crystal structure

Arid

DOI	10.1007/s00269-019-01022-4
	Natural bentoriteCr(3+) derivate of ettringite: determination of crystal structure
	Seryotkin, Yurii V.1,2; Sokol, Ella V.1; Kokh, Svetlana N.1; Sharygin, Victor V.1,2
通讯作者	Kokh, Svetlana N.
来源期刊	PHYSICS AND CHEMISTRY OF MINERALS
ISSN	0342-1791
EISSN	1432-2021
出版年	2019
卷号	46 期号:6 页码:553-570
英文摘要	Bentorite, a Cr3+-substituted analogue of ettringite (Ca6Cr2(SO4)(3)(OH)(12)26H(2)O), has been found as veinlet filling at its holotype locality in the Hatrurim Basin (Negev Desert). Quite abundant massive bentorite with Cr/(Cr+Al) ratios up to 0.95-0.99 coexists with sporadic portlandite, gypsum, afwillite, truscottite, fluorapatite, tobermorite, calcite, and vaterite. It occurs as almost monomineralic clots composed of fibrous grains. The crystal structure of bentorite has been determined and refined for the first time by XRD powder diffraction coupled with high-accuracy synchrotron low-temperature measurements at 100, 250K and 295K. Bentorite is isostructural with ettringite, space group P31c. The analysed bentorite sample has a trigonal unit cell with the parameters a=11.16150(5), c=21.63017(19)angstrom, V=2333.650(19)angstrom(3) at 100K; a=11.17790(5), c=21.7375(2)angstrom, and V=2352.12(2)angstrom(3) at 250K, and a=11.2110(2), c=21.7654(7)angstrom, and V=2369.10(7)angstrom(3) at 295K. The bentorite structure includes only (SO4)(2-)-groups, three anions per formula unit, as in ettringite. Unlike ettringite, bentorite has Cr3+ instead of Al3+ cations, this being the only difference in chemistry. The obtained structure confirms the existence of a continuous series of ettringite solid solutions over the whole range 0 <= Cr3+/(Al+Cr3+)<= 1.
英文关键词	Bentorite Crystal structure Bentorite-ettringite solid solutions Chromium
类型	Article
语种	英语
国家	Russia
收录类别	SCI-E
WOS记录号	WOS:000468209800002
WOS关键词	SOLID-SOLUTION ; MOTTLED ZONE ; RAMAN-SPECTROSCOPY ; ORGANIC-MATTER ; DEAD-SEA ; MINERALS ; ORIGIN ; AREA ; CR ; DIFFRACTION
WOS类目	Materials Science, Multidisciplinary ; Mineralogy
WOS研究方向	Materials Science ; Mineralogy
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/217957
作者单位	1.Russian Acad Sci, Sobolev Inst Geol & Mineral, Siberian Branch, 3 Koptyug Ave, Novosibirsk 630090, Russia; 2.Novosibirsk State Univ, 2 Pirogov St, Novosibirsk 630090, Russia
推荐引用方式 GB/T 7714	Seryotkin, Yurii V.,Sokol, Ella V.,Kokh, Svetlana N.,et al. Natural bentoriteCr(3+) derivate of ettringite: determination of crystal structure[J],2019,46(6):553-570.
APA	Seryotkin, Yurii V.,Sokol, Ella V.,Kokh, Svetlana N.,&Sharygin, Victor V..(2019).Natural bentoriteCr(3+) derivate of ettringite: determination of crystal structure.PHYSICS AND CHEMISTRY OF MINERALS,46(6),553-570.
MLA	Seryotkin, Yurii V.,et al."Natural bentoriteCr(3+) derivate of ettringite: determination of crystal structure".PHYSICS AND CHEMISTRY OF MINERALS 46.6(2019):553-570.