@article{1160888f46cd4c3d805c1fcd68d11eab,
title = "Crystal structure and thermal behavior of Bi 6 Te 2 O 15: Investigation of synthetic and natural pingguite",
abstract = "The previously unknown crystal structure of pingguite was determined and refined from laboratory X-ray powder diffraction data using a synthetic sample. Additional single crystal diffraction of natural pingguite confirms that the crystal structure of the synthetic sample is identical to the natural mineral. This new crystal structure calls for a revised chemistry of the rare mineral pingguite to Bi6Te2O15 instead of the previously reported formula Bi6Te2O13. Pingguite contains TeVI only and not TeIV as previously reported. Pingguite undergoes an irreversible phase transition around 840 ∘C which is characterized by a loss of oxygen and a reduction from TeVI to TeIV resulting in a δ-Bi2O3 like type structure. In addition, we report the Raman spectroscopic data on the natural pingguite.",
keywords = "Blue Bell, California, Crystal structure, High-temperature transformation, Pingguite, Tellurate, USA",
author = "Gwilherm N{\'e}nert and Missen, {Owen P.} and Hong Lian and Matthias Weil and Blake, {Graeme R.} and Kampf, {Anthony R.} and Mills, {Stuart J.}",
note = "Funding Information: Support funding has been provided to OPM by an Australian Government Research Training Program (RTP) Scholarship, a Monash Graduate Excellence Scholarship (MGES) and a Robert Blackwood Monash-Museums Victoria scholarship. Part of this study has been funded by the Ian Potter Foundation grant tracking tellurium to SJM and by the John Jago Trelawney Endowment to the Mineral Sciences Department of the Natural History Museum of Los Angeles County to ARK. We thank Rob Housley (Caltech) for measuring the Raman spectrum of natural pingguite, Marek Chorazewicz for his work in identifying pingguite specimens from the Blue Bell mine area and Brent Thorne for providing the optical photo of pingguite. OPM additionally thanks TU Wien for extending the invitation to spend a portion of his PhD research in Vienna. Part of this study was funded by the John Jago Trelawney Endowment to the Mineral Sciences Department of the Natural History Museum of Los Angeles County. H. L. acknowledges financial support from the China Scholarship Council. Funding Information: Support funding has been provided to OPM by an Australian Government Research Training Program (RTP) Scholarship, a Monash Graduate Excellence Scholarship (MGES) and a Robert Blackwood Monash-Museums Victoria scholarship. Part of this study has been funded by the Ian Potter Foundation grant tracking tellurium to SJM and by the John Jago Trelawney Endowment to the Mineral Sciences Department of the Natural History Museum of Los Angeles County to ARK. We thank Rob Housley (Caltech) for measuring the Raman spectrum of natural pingguite, Marek Chorazewicz for his work in identifying pingguite specimens from the Blue Bell mine area and Brent Thorne for providing the optical photo of pingguite. OPM additionally thanks TU Wien for extending the invitation to spend a portion of his PhD research in Vienna. Part of this study was funded by the John Jago Trelawney Endowment to the Mineral Sciences Department of the Natural History Museum of Los Angeles County. H. L. acknowledges financial support from the China Scholarship Council. Publisher Copyright: {\textcopyright} 2020, Springer-Verlag GmbH Germany, part of Springer Nature. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.",
year = "2020",
month = dec,
doi = "10.1007/s00269-020-01121-7",
language = "English",
volume = "47",
journal = "Physics and Chemistry of Minerals",
issn = "0342-1791",
number = "12",
}