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Volume 18 Issue 3
Sep.  2021
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REN Qianqian, CHEN Meihua, WANG Chengsi, WU Gai. Analysis of UV-Vis Spectrum on Pink-Purple Spinel from Burma before and after Heat Treatment[J]. Journal of Gems & Gemmology, 2016, 18(3): 24-30.
Citation: REN Qianqian, CHEN Meihua, WANG Chengsi, WU Gai. Analysis of UV-Vis Spectrum on Pink-Purple Spinel from Burma before and after Heat Treatment[J]. Journal of Gems & Gemmology, 2016, 18(3): 24-30.
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Analysis of UV-Vis Spectrum on Pink-Purple Spinel from Burma before and after Heat Treatment

  • 1. Gemmological Institute, China University of Geosciences, Wuhan 430074, China;

  • 2. School of Earth Sciences, China University of Geosciences, Wuhan 430074, China

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  • Received Date: January 24, 2016
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    • Abstract
  • In this paper, 5 pieces of pink-purple spinels from Burma were selected as experimental samples and heated at 1 200℃ and 1 600℃ for 10 hours respectively.Through laser induced breakdown spectroscopy (LIBS) analysis for the chemical compositions and UV-Vis spectroscopy, it was found that all samples were MgAl2O4 with trace amount of element Fe and the UV-Vis absorption bands were basically the same in the range 350-600 nm.The causes for their colours may be related to spin-forbidden transition of Fe3+ in octahedral site and Fe2+ in tetrahedral site and charge transfer between these pairs.Comparing UV-Vis spectra before and after heat treatment, it was found that the absorption intensity of all samples were enhaced dramatically in 350-430 nm and 500-600 nm areas.The absorption band at 350-430 nm is believed to be caused by increasing intervalence charge transfer between O2-→Fe2+、Fe3+ after the disorder structural transition.The absorption band at 500-600 nm is believed to be caused by Fe3+ in tetrahedral site effected by Fe2+ in adjacent site.After the heat treatment at temperature of 1 600℃, the absorption intensity in near ultraviolet region increased again and led to a clear change in UV-Vis spectrum, which making the apparent colour of samples become redder, however, some samples fail to follow this result due to internal fissures and lower transparency.
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    • References (26)
  • [1]
    Peretti A.Spinel's alluring features[J].Gemstone,2014(2):60-64.
    [2]
    Christopher S, Elizabeth D, Wendi W, et al.A closer look at Vietnamese spinel[J].InColor,2008(3):11-13.
    [3]
    Jean B.Beauty and rarity-A quest for Vietnamese blue spinels[J].InColor,2010(2):18-23.
    [4]
    Spinel steps into the spotlight[EB/OL].http://www.diamonds.net/Magazine/Article,2011-05-10.
    [5]
    Pardieu V.Hunting for "Jedi" spinels in Mogok[J].Gems & Gemology,2014,50(1):46-57.
    [6]
    Malsy A, Klemmb L.Distinction of gem spinels from the himalayan mountain belt[J].Chimia,2010,64(10):741-746.
    [7]
    Andreozzi G B, Princivalle F, Skogby H, et al.Cation ordering and structural variations with temperature in MgAl2O4 spinel:An X-ray single-crystal study[J].American Mineralogist,2000,85(9):1164-1171.
    [8]
    Spinel structure[EB/OL].http://chemwiki.ucdavis.edu, 2015-10-11.
    [9]
    Uchida H, Downs R T, Chesley J, et al.Single-crystal X-ray diffraction of spinels from the San Carlos Volcanic Field, Arizona:Spinel as a geothermometer[J].American Mineralogist,2005,90(11-12):1900-1908.
    [10]
    Malsy A K, Karampelas S, Schwarz D, et al.Orangey red to orangey pink gem spinels from a new deposit at Lang Chap[J].The Journal of Gemmology,2012,33(1-4):19-27.
    [11]
    Chauviré B, Rondeau B, Fritsch E, et al.Blue spinel from the Luc Yen District of Vietnam[J].Gems & Gemology,2015,51(1):2-17.
    [12]
    D'Ippolito V.Linking crystal chemistry and physical properties of natural and synthetic spinels:An UV-Vis-NIR and Raman study[D].Roma:Sapienza Universita,2013.
    [13]
    D'Ippolito V, Andreozzi G B, Hålenius U, et al.Color mechanisms in spinel:Cobalt and iron interplay for the blue color[J].Physics & Chemistry of Minerals,2015,42(6):431-439.
    [14]
    Andreozzi G B, Halenius H, Skogby H.Spectroscopic activeIVFe3+-VIFe3+ clusters in spinel-magnesionferrite solid solution crystals:A potential minitor for ordering in oxide spinels[J].Physics & Chemistry of Minerals, 2001,28(7):435-444.
    [15]
    Taran M N, Kochmüller M, Langer K.Electronic absorption spectroscopy of natural (Fe2+, Fe3+)-bearing spinels of spinel s.s.-hercynite and gahnite-hercynite solid solutions at different temperatures and high-pressures[J].Physics & Chemistry of Minerals,2005,32(3):175-188.
    [16]
    Shen A H, Christopher M B, DeGhionno D.Natural spinel, identified with photoluminescence[J].Gems & Gemology,2004,40(2):168-169.
    [17]
    Halenius U,Andreozzi B,Skogby H.Structural relaxation around Cr3+ and the red-green color change in the spinel (sensustricto)-magnesiochromite (MgAl2O4-MgCr2O4) and gahnitezincochromite (ZnAl2O4-ZnCr2O4) solid-solution series[J].American Mineralogist,2010,95(4):456-462.
    [18]
    Ikeda K,Nakamura Y,Masumoto K,et al.Optical spectra of synthetic spinels in the system MgAl2O4-MgCr2O4[J].Journal of the American Ceramic Society,2005,80(10):2672-2676.
    [19]
    Taran M N, Langer K, Platonov A N, et al.Optical absorption investigation of Cr3+ ion-bearing minerals in the temperature range 77-797 K[J].Physics & Chemistry of Minerals,1994,21(6):360-372.
    [20]
    Fregola R A, Bosi F, Skogby H, et al.Optical absorption spectroscopy study of the causes for color variations in natural Fe-bearing gahnite:Insights from iron valency and site distribution data[J].American Mineralogist,2014,99(11-12):2187-2195.
    [21]
    Redfern S A T,Harrison R J, O'Neill H S C, et al.Thermodynamics and kinetics of cation ordering in MgAl2O4 spinel up to 1600℃ from in situ neutron diffraction[J].American Mineralogist,1999,84(3):299-310.
    [22]
    Yamanaka T, Takéuchi Y.Order-disorder transition in MgAl2O4 spinel at high temperatures up to 1700℃[J].Zeitschrift Fur Kristallographie,1983,165(1-4):65-78.
    [23]
    Taran M N, Parisi F, Lenaz D, et al.Synthetic and natural chromium-bearing spinels:An optical spectroscopy study[J].Phys Chem Minerals,2014,41(8):593-602.
    [24]
    Steven D.Spinel structure[EB/OL].http://www.uwgb.edu/dutchs/Petrology/spinel, 2015-09-19.
    [25]
    Schmetzer K, Haxel C, Amthauer G.Colour of natural spinels, gahnospinels and gahnites[J].Neues Jahrbuch fuer Mineralogie Abhandlungen,1986(160):159-180.
    [26]
    Peterson R C, Lager G A, Hrrterman R L.A time-of-flight neutron powder diffraction study of MgAl2O4 at temperatures up to 1273 K[J].American Mineralogist, 1991, 76(9-10):1589-1596.
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