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The structural role of Ag in galena (PbS). A XANES study
Giuli, G; Paris, E; Wu ZY(吴自玉); Wu, ZY; De Panfilis, S; Pratesi, G; Cipriani, C
2005
发表期刊PHYSICA SCRIPTA
卷号T115页码:387-389
通讯作者[Giuli, Gabriele ; Paris, Eleonora] Univ Camerino, Dipartimento Sci Terra, I-62032 Camerino, Italy ; [Giuli, Gabriele ; Paris, Eleonora] Univ Camerino, Unita INFM, I-62032 Camerino, Italy ; [De Panfilis, Simone] Chinese Acad Sci, Inst High Energy Phys, Beijing Synchrotron Radiat Facil, Beijing 100039, Peoples R China ; [Pratesi, Giovanni ; Cipriani, Curzio] Univ Florence, Dipartimento Sci Terra, I-50121 Florence, Italy ; [De Panfilis, Simone] ESRF, Grenoble, France
文章类型Article
摘要A number of Ag-bearing galena samples (PbS) has been investigated by Ag K-edge XAS in order to determine the Ag structural role within the host galena structure. Despite the very low absorber concentration and the high absorbance of the PbS matrix, XANES spectra were successfully collected for samples with Ag content down to 500 ppm. Theoretical spectra have been calculated with the CONTINUUM code in order to discriminate the contributions from Ag located in the two possible sites in the galena structure: the Pb site (located at Wyckoff position 4b, octahedral S coordination, site symmetry m3m), and an interstitial site ( located at Wyckoff position 8c, tetrahedral S plus tetrahedral Pb coordination, site symmetry (4) under bar 3m). Experimental spectrum of diaphorite (a Ag-bearing mineral phase forming nano- to micro inclusions in Ag-rich galena) have been used for comparison. The XANES experimental spectra show two different types of Ag environment: a) the samples with high Ag content display spectra similar to that of diaphorite, as evidenced by the theoretical spectra, suggesting that, when present in considerable amount, most of the Ag partitions into the diaphorite inclusions rather than entering the galena structure; b) trace level Ag-bearing samples display spectra very different from that of diaphorite. In view of the absence of micro- and nano- inclusions in the latter samples (confirmed by electron microscopy), these spectra are taken as representative of the Ag environment in the host galena structure. In these samples the comparison between experimental and theoretical spectra shows that the spectrum can be interpreted as the sum of the two contributions from Ag located in the 8c and 4b positions in the galena structure, in approximately the same proportions. Therefore, the data suggest that in this type of galena sample, half of the Ag occupies the vacant Pb site whereas the remaining part is located in the interstitial 4b site.
学科领域Physics
研究领域[WOS]Physics ; Physics
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语种英语
研究领域[WOS]Physics ; Physics
WOS类目Physics, Multidisciplinary
WOS记录号WOS:000204272100110
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被引频次:4[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/237275
专题多学科研究中心
作者单位中国科学院高能物理研究所
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Giuli, G,Paris, E,Wu ZY,et al. The structural role of Ag in galena (PbS). A XANES study[J]. PHYSICA SCRIPTA,2005,T115:387-389.
APA Giuli, G.,Paris, E.,吴自玉.,Wu, ZY.,De Panfilis, S.,...&Cipriani, C.(2005).The structural role of Ag in galena (PbS). A XANES study.PHYSICA SCRIPTA,T115,387-389.
MLA Giuli, G,et al."The structural role of Ag in galena (PbS). A XANES study".PHYSICA SCRIPTA T115(2005):387-389.
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