A thermogravimetric, scanning electron microscope and vibrational spectroscopic study of the phosphate mineral santabarbaraite from Santa Barbara mine, Tuscany, Italy

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• 作者：Ray L. Frost ; Ricardo Scholz ; Xiuxiu Ruan…
• 关键词：Santabarbaraite ; Phosphate ; Thermal analysis ; Dehydration ; Dehydroxylation ; SEM ; EDX ; Raman spectroscopy
• 刊名：Journal of Thermal Analysis and Calorimetry
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：124
• 期：2
• 页码：639-644
• 全文大小：983 KB
• 参考文献：1.Chukanov NV. Mineralogical almanac famous mineral localities series Kerch iron–ore basin. 2005. p. 112.
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  3.Kolitsch U, Bernhardt H, Lengauer CL, Blass G, Tillmanns E. Allanpringite, Fe3(PO4)2(OH)3·5H2O, a new ferric iron phosphate from Germany, and its close relation to wavellite. Eur J Miner. 2006;18(6):793–801. doi:10.​1127/​0935-1221/​2006/​0018-0793 .CrossRef
  4.Capitelli F, Ventura GD, Bellatreccia F, Sodo A, Saviano M, Ghiara MR, et al. Crystal-chemical study of wavellite from Zbirov, Czech Republic. Miner Mag. 2014;78:1057–70.
  5.Liu Q, Zhang S, Cheng H, Wang D, Li X, Hou X, et al. Thermal behavior of kaolinite-urea intercalation complex and molecular dynamics simulation for urea molecule orientation. J Therm Anal Calorim. 2014;. doi:10.​1007/​s10973-014-3646-1 .
  6.Cheng H, Liu Q, Zhang S, Wang S, Frost RL. Evolved gas analysis of coal-derived pyrite/marcasite. J Therm Anal Calorim. 2014;116(2):887–94. doi:10.​1007/​s10973-013-3595-0 .CrossRef
  7.Theiss FL, Ayoko GA, Frost RL. Thermogravimetric analysis of selected layered double hydroxides. J Therm Anal Calorim. 2013;112(2):649–57. doi:10.​1007/​s10973-012-2584-z .CrossRef
  8.Frost RL, Xi Y. Thermogravimetric analysis of the copper silicate mineral dioptase Cu6[Si6O18]·6H2O. J Therm Anal Calorim. 2013;112(2):615–9. doi:10.​1007/​s10973-012-2599-5 .CrossRef
  9.Frost RL, Xi Y. Thermoanalytical study of the minerals apophyllite-(KF) KCa4Si8O20F·8H2O and apophyllite-(KOH) KCa4Si8O20(F, OH)·8H2O. J Therm Anal Calorim. 2013;112(2):607–14. doi:10.​1007/​s10973-012-2615-9 .CrossRef
  10.Frost RL, Palmer SJ, Pogson RE. Thermal stability of crandallite CaAl3(PO4)2(OH)5·(H2O). J Therm Anal Calorim. 2012;107(3):905–9. doi:10.​1007/​s10973-011-1578-6 .CrossRef
  11.Frost RL, Palmer SJ, Pogson RE. Thermal stability of newberyite Mg(PO3OH)·3H2O. J Therm Anal Calorim. 2012;107(3):1143–6. doi:10.​1007/​s10973-011-1593-7 .CrossRef
  12.Frost RL, Palmer SJ, Pogson R. Thermal stability of the cave’ mineral ardealite Ca2(HPO4)(SO4)·4H2O. J Therm Anal Calorim. 2012;107(2):549–53. doi:10.​1007/​s10973-011-1458-0 .CrossRef
  13.Lopez A, Frost RL, Xi Y, Scholz R. Vibrational spectroscopic characterization of the sulphate-carbonate mineral burkeite: implications for evaporites. Spectrosc Lett. 2014;47(7):564–70. doi:10.​1080/​00387010.​2013.​825273 .CrossRef
  14.Lopez A, Frost RL, Xi Y, Scholz R. A vibrational spectroscopic study of the sulfate mineral glauberite. Spectrosc Lett. 2014;47(10):740–5. doi:10.​1080/​00387010.​2013.​841254 .CrossRef
  15.Lopez A, Frost RL, Xi Y, Scholz R. Vibrational spectroscopic characterization of the arsenate mineral barahonaite: implications for the molecular structure. Spectrosc Lett. 2014;47(7):571–8. doi:10.​1080/​00387010.​2013.​825274 .CrossRef
  16.Breitinger DK, Belz HH, Hajba L, Komlosi V, Mink J, Brehm G, et al. Combined vibrational spectra of natural wardite. J Mol Struct. 2004;706(1–3):95–9. doi:10.​1016/​j.​molstruc.​2004.​01.​039 .CrossRef
  
• 作者单位：Ray L. Frost (1)
  Ricardo Scholz (2)
  Xiuxiu Ruan (1)
  Rosa Malena Fernandes Lima (3)
  
  1. Science and Engineering Faculty, School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, GPO Box 2434, Brisbane, QLD, 4001, Australia
  2. Geology Department, School of Mines, Federal University of Ouro Preto, Campus Morro do Cruzeiro, Ouro Preto, MG, 35400-00, Brazil
  3. Mining Engineering Department, School of Mines, Federal University of Ouro Preto, Campus Morro do Cruzeiro, Ouro Preto, MG, 35400-00, Brazil
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Sciences
  Polymer Sciences
  Physical Chemistry
  Inorganic Chemistry
  Measurement Science and Instrumentation
  
• 出版者：Akad茅miai Kiad贸, co-published with Springer Science+Business Media B.V., Formerly Kluwer Academic
• ISSN：1572-8943

文摘

A santabarbaraite mineral sample from Italy has been examined by thermal analysis, scanning electron microscopy with energy dispersive spectroscopy and vibrational spectroscopy. Chemical composition shows a Fe phosphate phase with minor amounts of Mn, Mg, K and Na were also observed. The santabarbaraite mineral was characterized by thermal analysis. Thermogravimetric analysis of the santabarbaraite mineral were obtained by using TA Instruments Inc. Q50 high-resolution TGA operating at a 10 °C min−1 ramp with data sample interval of 0.50 s pt−1 from room temperature to 1000 °C in a high-purity flowing nitrogen atmosphere (100 cm3 min−1). Two mass loss steps are observed at 105 and 364.8 °C and are attributed to dehydration and dehydroxylation. Not all phosphate units are identical in the structure of santabarbaraite. This is reflected in the width of both the Raman and infrared bands. Two strong broad Raman bands observed at 1007 and 1095 cm−1 are assigned to the phosphate ν ₁ symmetric and ν ₃ antisymmetric stretching mode. Raman bands observed at 561, 592 and 630 cm−1 are assigned to the ν ₄ out of plane bending modes of the phosphate units. The observation of multiple bands supports the concept of non-equivalent phosphate units in the structure. Broad Raman bands observed at 3544 and 3611 cm−1 are attributed to the OH stretching vibrations of the hydroxyl units. Vibrational spectroscopy enables subtle details of the molecular structure of santabarbaraite to be determined. Thermal analysis characterises the stability of the mineral.