干旱区生态环境知识资源中心(Arid): Hydration of Na-saturated synthetic stevensite, a peculiar trioctahedral smectite

Arid

DOI	10.1180/clm.2020.32
	Hydration of Na-saturated synthetic stevensite, a peculiar trioctahedral smectite
	Vinci, Doriana; Lanson, Bruno; Lanson, Martine; Magnin, Valerie; Findling, Nathaniel
通讯作者	Lanson, B (corresponding author), Univ Grenoble Alpes, Univ Gustave Eiffel, ISTerre, CNRS,IRD,Univ Savoie Mt Blanc, F-38000 Grenoble, France.
来源期刊	CLAY MINERALS
ISSN	0009-8558
EISSN	1471-8030
出版年	2020
卷号	55 期号:3 页码:229-237
英文摘要	Smectite interlayer water plays a key role in the mobility of elements and molecules and affects a variety of geological processes. In trioctahedral smectites, in contrast to saponite and hectorite, the layer charge of which originates from isomorphic substitutions, the stevensite layer charge originates from the presence of octahedral vacancies. Despite its common occurrence in lacustrine environments, stevensite hydration has received little attention compared to saponite and hectorite. Early reports mention a specific hydration behaviour, however, with the systematic presence of a low-angle reflection attributed to the regular interstratification of various hydration states. The present study aims to revisit this specific hydration behaviour in more depth. Within this scope, the hydration behaviour of the three smectite varieties above are compared using synthetic trioctahedral smectites of similar layer charge and various compositions of their octahedral sheets. The chemical composition of the octahedral sheet does not appear to influence significantly smectite hydration for saponite and hectorite. Compared to its saponite and hectorite equivalents, H2O content in stevensite is lower by similar to 2.0 mmol H2O per g of dry clay. Consistent with this lower H2O content, Zn-stevensite lacks a stable monohydrated state, with dehydrated layers prevailing from 60% to 0% relative humidity. The presence of the regular interstratification of 0W and 1W layers is responsible for the low-angle reflection commonly observed for stevensite under air-dried conditions. Finally, the stevensite identification method based on X-ray diffraction of heated and ethylene glycol-solvated samples is challenged by the possible influence of the octahedral sheet chemical composition (Zn or Mg in the present study) on hectorite swelling behaviour in synthetic Zn-smectites. The origin of this effect remains undetermined and further work is needed to propose a more general identification method.
英文关键词	smectite hydration smectite identification stevensite
类型	Article
语种	英语
开放获取类型	Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000613694300003
WOS关键词	TETRAHEDRAL LAYER CHARGE. ; INTERLAYER WATER ; AMARGOSA DESERT ; CLAY ; MONTMORILLONITE ; DIFFUSION ; INTERCALATION ; ORGANIZATION ; SAPONITES ; DYNAMICS
WOS类目	Chemistry, Physical ; Geosciences, Multidisciplinary ; Mineralogy
WOS研究方向	Chemistry ; Geology ; Mineralogy
来源机构	French National Research Institute for Sustainable Development
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/348784
作者单位	[Vinci, Doriana; Lanson, Bruno; Lanson, Martine; Magnin, Valerie; Findling, Nathaniel] Univ Grenoble Alpes, Univ Gustave Eiffel, ISTerre, CNRS,IRD,Univ Savoie Mt Blanc, F-38000 Grenoble, France; [Vinci, Doriana] Univ Bari Aldo Moro, Dipartimento Sci Terra & Geoambientali, Bari, Italy
推荐引用方式 GB/T 7714	Vinci, Doriana,Lanson, Bruno,Lanson, Martine,et al. Hydration of Na-saturated synthetic stevensite, a peculiar trioctahedral smectite[J]. French National Research Institute for Sustainable Development,2020,55(3):229-237.
APA	Vinci, Doriana,Lanson, Bruno,Lanson, Martine,Magnin, Valerie,&Findling, Nathaniel.(2020).Hydration of Na-saturated synthetic stevensite, a peculiar trioctahedral smectite.CLAY MINERALS,55(3),229-237.
MLA	Vinci, Doriana,et al."Hydration of Na-saturated synthetic stevensite, a peculiar trioctahedral smectite".CLAY MINERALS 55.3(2020):229-237.