干旱区生态环境知识资源中心(Arid): Incommensurately modulated crystal structure of flamite

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DOI	10.1107/S2052520619013623
	Incommensurately modulated crystal structure of flamite - natural analogue of alpha(H)'-Ca2SiO4
	Rashchenko, Sergey, V; Seryotkin, Yurii, V; Sokol, Ella, V; Kokh, Svetlana N.
通讯作者	Rashchenko, SV (corresponding author), Soboley Inst Geol & Mineral SB RAS, 3 Koptyuga Ave, Novosibirsk 630090, Russia. ; Rashchenko, SV (corresponding author), Noyosibirsk State Univ, 1 Pirogova St, Novosibirsk 630090, Russia.
来源期刊	ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE CRYSTAL ENGINEERING AND MATERIALS
EISSN	2052-5206
出版年	2019
卷号	75 页码:1137-1143
英文摘要	Crystal structures of unquenchable high-temperature polymorphs of Ca2SiO4, important in cement chemistry, have eluded single-crystal X-ray analysis. However, the problem may be addressed by studying chemically stabilized Ca2SiO4 polymorphs at ambient temperature. Here an incommensurately modulated crystal structure of flamite [Pnma(0 beta 0)00s, q = 0.2728 (2)b*, a = 6.8588 (2) angstrom, b = 5.4301 (2) angstrom, c = 9.4052 (3) angstrom] is described. It is a mineral analogue of orthorhombic alpha(H)'-Ca2SiO4 (stable between 1160 and 1425 degrees C), naturally stabilized by substitution with phosphorus. The incommensurate modulation results from wave-like displacement of cation sites accompanied by tilting of (Si,P)O-4 tetrahedra and variation of the Na/(Ca + Na + K) ratio along the modulation period. The studied sample from Hatrurim Basin (Negev Desert, Israel) with composition (Ca1.75K0.12Na0.12)(1.99)(Si0.74P0.26)(1.00)O-4 also demonstrates pseudomerohedral cyclic twinning around the a axis, which results from pseudohexagonal topology of the crystal structure and complicates the indexing of X-ray diffraction data.
英文关键词	flamite calcium orthosilicate aperiodic structure incommensurate modulation combustion metamorphism
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000510450900025
WOS关键词	SOLID-SOLUTION ; DICALCIUM ; TEMPERATURE ; ROCKS ; PHASE ; NA
WOS类目	Chemistry, Multidisciplinary ; Crystallography
WOS研究方向	Chemistry ; Crystallography
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/369648
作者单位	[Rashchenko, Sergey, V; Seryotkin, Yurii, V; Sokol, Ella, V; Kokh, Svetlana N.] Soboley Inst Geol & Mineral SB RAS, 3 Koptyuga Ave, Novosibirsk 630090, Russia; [Rashchenko, Sergey, V; Seryotkin, Yurii, V] Noyosibirsk State Univ, 1 Pirogova St, Novosibirsk 630090, Russia
推荐引用方式 GB/T 7714	Rashchenko, Sergey, V,Seryotkin, Yurii, V,Sokol, Ella, V,et al. Incommensurately modulated crystal structure of flamite - natural analogue of alpha(H)'-Ca2SiO4[J],2019,75:1137-1143.
APA	Rashchenko, Sergey, V,Seryotkin, Yurii, V,Sokol, Ella, V,&Kokh, Svetlana N..(2019).Incommensurately modulated crystal structure of flamite - natural analogue of alpha(H)'-Ca2SiO4.ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE CRYSTAL ENGINEERING AND MATERIALS,75,1137-1143.
MLA	Rashchenko, Sergey, V,et al."Incommensurately modulated crystal structure of flamite - natural analogue of alpha(H)'-Ca2SiO4".ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE CRYSTAL ENGINEERING AND MATERIALS 75(2019):1137-1143.