Spectroscopic Characteristics and Coloring Mechanisms of Different Colored Spinels from Myanmar
Abstract
1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Methods
3. Results and Discussion
3.1. Gemological and Crystallographic Characteristics
3.2. Composition Analysis of Myanmar Spinel
X-ray Fluorescence Spectroscopy (XRF)
3.3. Spectroscopy Analysis of Myanmar Spinel
3.3.1. Fourier Transform Infrared Spectroscopy (FTIR)
3.3.2. Raman Spectra
3.3.3. UV-Vis Spectroscopy
4. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Sample | Color | Weight (c t) | Specific Grsavity | Fluorescence (LW) | Chelsea Color Filter | Grating Spectroscope (Hand-Held) |
---|---|---|---|---|---|---|
M1 | Pink | 0.228 | 3.45 | Dark red | No change | / |
M2 | Light violet | 0.338 | 3.56 | Dark red | Pink tones | / |
M3 | Orange | 0.586 | 3.55 | Red | No change | / |
M4 | Orange-Violet | 0.727 | 3.55 | Bright Red | No change | / |
M5 | Red | 0.377 | 3.59 | Bright Red | Bright red tones | Chromium absorption |
M6 | Light blue | 0.515 | 3.58 | None | No change | / |
M7 | Blue | 0.394 | 3.58 | None | No change | Ferrum absorption |
Sample Number | Color | Al2O3 | MgO | Cr2O3 | V2O5 | Fe2O3 | ZnO | SiO2 | SO3 | TiO2 |
---|---|---|---|---|---|---|---|---|---|---|
M1 | pink | 68.311 | 28.501 | 0.161 | 0.173 | 0.118 | 0.087 | 1.667 | 0.917 | ND |
M2 | violet | 57.808 | 25.346 | 0.297 | 0.181 | 0.739 | 1.980 | 2.504 | 0.956 | ND |
M3 | orange | 66.665 | 30.3271 | 0.076 | 0.489 | 0.077 | 0.084 | 1.260 | 0.939 | ND |
M4 | orange-violet | 67.507 | 29.809 | 0.148 | 0.038 | 0.399 | 0.079 | 1.079 | 0.822 | ND |
M5 | red | 65.668 | 30.229 | 1.537 | 0.277 | 0.124 | 0.051 | 1.852 | ND | 0.149 |
M6 | blue | 69.355 | 18.028 | 0.230 | 0.046 | 1.559 | 0.610 | 5.162 | 4.666 | 0.081 |
M7 | blue | 69.576 | 16.238 | ND | 0.312 | 1.901 | 0.159 | 5.284 | 6.340 | 0.044 |
Sample | M1 Pink | M3 Orange | M4 Orange | M5 Red | Assignment | Electronic Transition |
---|---|---|---|---|---|---|
a | / | / | / | / | MCr3+ | Spin-forbidden 4A2g(4F) → 2T1g(2G) |
b | / | / | 382 | 382 | MCr3+ | Spin-allowed 4A2g → 2T1g(F) |
c | 391 | 391 | 390 | 392 | MV3+ | Spin-allowed 3T1g(F) → 3T1g(P) |
d | 410 | 416 | / | 418 | MCr3+ | Spin-allowed 4A2g → 2T1g(F) |
e | / | / | 530 | 535 | MCr3+ | Spin-allowed 4A2g → 2T2g(F) |
f | 542 | 542 | / | / | MV3+ | Spin-allowed 3T1(F) → 3T2(F) |
g | / | / | / | / | MCr3+ | Spin-allowed 4A2g → 2T2g(F) |
h | 669 | 668 | 668 | 660 | Fe2+-Fe3+ | Fe2+-Fe3+ charge transfer |
i | / | / | / | / | MFe2+ | Spin-allowed 5T2g → 5Eg |
Sample | M2 Violet | M6 Blue | Assignment | Electronic Transition |
---|---|---|---|---|
a | 373 | 373 | TFe2+ | Spin-forbidden5E → 3E |
b | 387 | 387 | TFe2+ | Spin-forbidden 5E → 3T1, 3T2 |
c | 411 | 411 | TFe2+ | Spin-forbidden 5E → 3T1 |
d | 457 | 458 | MFe3+ | 6A1g → 4A1g, 4Eg |
e | / | 474 | MFe3+ | |
f | 555 | 554 | TFe2+ | Spin-forbidden 5E → 3T2 |
g | / | 590 | TFe2+ | Spin-forbidden 5E → 3T2 |
h | 657 | 670 | MFe2+ | Fe2-Fe3+ charge transfer |
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Zhang, L.; He, K.; Guo, Q. Spectroscopic Characteristics and Coloring Mechanisms of Different Colored Spinels from Myanmar. Crystals 2023, 13, 575. https://doi.org/10.3390/cryst13040575
Zhang L, He K, Guo Q. Spectroscopic Characteristics and Coloring Mechanisms of Different Colored Spinels from Myanmar. Crystals. 2023; 13(4):575. https://doi.org/10.3390/cryst13040575
Chicago/Turabian StyleZhang, Lei, Kui He, and Qingfeng Guo. 2023. "Spectroscopic Characteristics and Coloring Mechanisms of Different Colored Spinels from Myanmar" Crystals 13, no. 4: 575. https://doi.org/10.3390/cryst13040575
APA StyleZhang, L., He, K., & Guo, Q. (2023). Spectroscopic Characteristics and Coloring Mechanisms of Different Colored Spinels from Myanmar. Crystals, 13(4), 575. https://doi.org/10.3390/cryst13040575