Site occupancy of Co and Ni in erythrite-annabergite solid solutions deduced by vibrational spectroscopy
Martens, Wayde N., Kloprogge, J. Theo, Frost, Ray L., & Rintoul, Llew (2005) Site occupancy of Co and Ni in erythrite-annabergite solid solutions deduced by vibrational spectroscopy. The Canadian Mineralogist, 43(3), pp. 1065-1075.
Members of the solid-solutions series between erythrite [Co3(AsO4)2.8H2O] and annabergite [Ni3(AsO4)2.8H2O] were synthesized and studied by a combination of X-ray diffraction, scanning electron microscopy, and Raman and infrared spectroscopy. The solid solution is complete, with the monoclinic C2/m space group being retained throughout. The unit-cell parameters decrease in size along all crystallographic directions as the amount of Ni increases. The β angle in the unit cell also decreases from 105.05(1) ° (erythrite) to 104.90(1) ° (annabergite). Crystals of annabergite and samples with high Ni content elongate along the a axis, contrasting with crystals of erythrite and Co-rich samples, which elongate along c. In the Raman and infrared spectra of the synthetic minerals, the band positions shift in accordance with the increase in bond strength associated with the decrease in the unit-cell parameters. Trends in Raman band positions of the antisymmetric arsenate stretching vibrations are sensitive to the site occupancy of metal ions in the crystal structure. Changes in the crystal morphology, unit-cell parameters and vibrational spectra have been rationalized in terms of the site occupancy of Co and Ni in the crystal structure. Substitution of Ni is directed to metal site 1 (C2h site symmetry) whereas Co is directed to metal site 2 (C2 site symmetry). Raman spectroscopy has proved to be useful for the determination of site occupancy of metal ions in solid solutions of minerals.
Impact and interest:
Citation counts are sourced monthly from and citation databases.
These databases contain citations from different subsets of available publications and different time periods and thus the citation count from each is usually different. Some works are not in either database and no count is displayed. Scopus includes citations from articles published in 1996 onwards, and Web of Science® generally from 1980 onwards.
Citations counts from theindexing service can be viewed at the linked Google Scholar™ search.
Full-text downloads displays the total number of times this work’s files (e.g., a PDF) have been downloaded from QUT ePrints as well as the number of downloads in the previous 365 days. The count includes downloads for all files if a work has more than one.
|Item Type:||Journal Article|
|Keywords:||erythrite, annabergite, cobalt arsenate, nickel arsenate, solid solution, Raman spectroscopy, vivianite group minerals, Infrared spectroscopy|
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Science and Technology|
|Copyright Owner:||Copyright 2005 Mineralogical Association of Canada|
|Copyright Statement:||Reproduced in accordance with the copyright policy of the publisher.|
|Deposited On:||26 Jul 2005 00:00|
|Last Modified:||25 Feb 2013 03:53|
Repository Staff Only: item control page