X-ray Photoelectron spectroscopic and Raman spectroscopic study of bayldonite from Wheal Carpenter, Cornwall, UK

Kloprogge, J. Theo and Wood, Barry J. (2017) X-ray Photoelectron spectroscopic and Raman spectroscopic study of bayldonite from Wheal Carpenter, Cornwall, UK. Vacuum, 141 49-56. doi:10.1016/j.vacuum.2017.03.018


Author Kloprogge, J. Theo
Wood, Barry J.
Title X-ray Photoelectron spectroscopic and Raman spectroscopic study of bayldonite from Wheal Carpenter, Cornwall, UK
Journal name Vacuum   Check publisher's open access policy
ISSN 0042-207X
1879-2715
Publication date 2017-07-01
Sub-type Article (original research)
DOI 10.1016/j.vacuum.2017.03.018
Open Access Status Not yet assessed
Volume 141
Start page 49
End page 56
Total pages 8
Place of publication Oxford, United Kingdom
Publisher Pergamon Press
Collection year 2018
Language eng
Formatted abstract
Bayldonite [Cu3Pb(AsO4)2(OH)2], Wheal Carpenter (Cornwall, UK) was studied by X-ray Photoelectron Spectroscopy and Raman Microscopy. X-ray Photoelectron Spectroscopy revealed single copper, lead and arsenic positions in the crystal structure. Two oxygen bands with a 1:4 ratio were associated oxygen positions in arsenate- and hydroxyl-groups, excluding the presence of acidic arsenate groups. The relatively large difference in binding energy for the two oxygen bands was interpreted as being due to the dynamic Jahn-Teller distortion of the copper octahedral in the bayldonite crystal structure. Raman microscopy showed bands at 804 and 837 cm−1 assigned to arsenate antisymmetric stretching mode and the symmetric stretching mode. Supported by the X-ray Photoelectron Spectroscopic results the bands at 726, 761, 822 and 886 cm−1 were assigned to copper-hydroxyl modes. Bands around 497 cm−1 were assigned to the arsenate antisymmetric bending modes and around 427 cm−1 to the symmetric bending modes. The 539 cm−1 band was associated with a copper-hydroxyl stretching mode or another υ4. The region 250–400 cm−1 showed sharp bands at 313 and 328 cm−1 with weaker bands at 298 and 342 cm−1 assigned to copper-oxygen and/or lead-oxygen stretching modes.
Keyword Arsenate
Bayldonite
Hydroxyl
Raman spectroscopy
X-ray Photoelectron spectroscopy
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
Centre for Microscopy and Microanalysis Publications
School of Earth and Environmental Sciences
 
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