• Laser & Optoelectronics Progress
  • Vol. 58, Issue 5, 0530001 (2021)
Shanshan He, Pan Cao, Honglin Tan, and Endong Zu*
Author Affiliations
  • Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming , Yunnan 650093, China
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    DOI: 10.3788/LOP202158.0530001 Cite this Article Set citation alerts
    Shanshan He, Pan Cao, Honglin Tan, Endong Zu. Comparative Study on Spectral Characteristics of Natural and Flame-Melting Synthetic Spinels[J]. Laser & Optoelectronics Progress, 2021, 58(5): 0530001 Copy Citation Text show less
    Mid infrared spectra of natural spinels
    Fig. 1. Mid infrared spectra of natural spinels
    Mid infrared spectra of flame-melting synthetic spinels
    Fig. 2. Mid infrared spectra of flame-melting synthetic spinels
    Near infrared spectra of natural spinels
    Fig. 3. Near infrared spectra of natural spinels
    Near infrared spectra of flame-melting synthetic spinels
    Fig. 4. Near infrared spectra of flame-melting synthetic spinels
    XRF spectra of natural spinels. (a) Sample N9; (b) sample N5
    Fig. 5. XRF spectra of natural spinels. (a) Sample N9; (b) sample N5
    XRF spectra of flame-melting synthetic spinels. (a) Sample S1; (b) sample S4
    Fig. 6. XRF spectra of flame-melting synthetic spinels. (a) Sample S1; (b) sample S4
    Reflection spectra of natural spinels
    Fig. 7. Reflection spectra of natural spinels
    Reflection spectra of flame-melting synthetic spinels
    Fig. 8. Reflection spectra of flame-melting synthetic spinels
    Raman spectrum of natural spinel
    Fig. 9. Raman spectrum of natural spinel
    Raman spectrum of flame-melting synthetic spinel
    Fig. 10. Raman spectrum of flame-melting synthetic spinel
    Fitting curve of flame-melting natural spinel
    Fig. 11. Fitting curve of flame-melting natural spinel
    Fitting curve of flame-melting synthetic spinel
    Fig. 12. Fitting curve of flame-melting synthetic spinel
    No.ColorRefractive indexUltraviolet fluorescenceSpectroscopeMorphology
    N1Red1.718NoNoClean inside
    N2Purple1.718NoNoClean inside
    N3Blue1.712NoNoHealing fissure
    N4Red1.718NoNoClean inside
    N5Purple1.71(±)NoNoHealing fissure
    N6Blue1.720NoNoHealing fissure
    N7Pink1.720NoNoColorless short columnar crystal inclusion
    N8Pink1.720NoNoClean inside
    N9Rose1.720NoNoClean inside
    N10Blue1.712NoNoClean inside
    S1Blue1.728LW: no; SW: blue and whiteCoCurved growth pattern
    S2Green1.728LW: no; SW: blue and whiteCoCurved growth pattern
    S3White1.728LW: no; SW: blue and whiteNoCurved growth pattern
    S4Green1.728LW: no; SW: blue and whiteCoClean inside
    S5White1.728LW: no; SW: blue and whiteNoClean inside
    S6Blue1.728LW: no; SW: blue and whiteNoClean inside
    Table 1. Conventional gemological parameters of natural and synthetic spinels
    Sample No.FWHM/cm-1
    N113.8,12.5
    N211.3,11.3
    N312.0,13.4
    N410.7,10.0
    N511.4,10.8,11.9
    N610.7,11.7
    N710.4,10.8
    N810.4,12.0,11.6
    N913.3,14.3
    N1010.6,11.9
    S113.9,7.4,7.7,2.8
    S22.9,3.7,5.3
    S36.9,3.0,8.8,6.8
    S45.5,3.5,4.3,4.0
    S51.3,4.6,3.9
    S65.0,2.1,3.8,7.7
    Table 2. FWHM of spinels
    ItemNumber of FWHM pointAverage of FWHMBias of FWHMError of FWHMConfidence intervalMinimum of FWHMMaximum of FWHM
    Lower limitUpper limit
    Natural spinel2211.6731.1760.25111.15212.19410.0014.30
    Synthetic spinel225.2232.7920.5953.9856.4611.3013.90
    Total448.4483.8890.5867.2659.6301.3014.30
    Table 3. Descriptive statistics of natural spinel and flame-melting synthetic spinel
    ItemSum of squaresDegree of freedomMean squareFSig.
    Interblock457.6281457.62899.7410
    Group192.702424.588
    Total650.33043
    Table 4. ANOVA of natural spinel and flame-melting synthetic spinel
    Shanshan He, Pan Cao, Honglin Tan, Endong Zu. Comparative Study on Spectral Characteristics of Natural and Flame-Melting Synthetic Spinels[J]. Laser & Optoelectronics Progress, 2021, 58(5): 0530001
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