Study on low-temperature heat treatment of purplish red sapphire

Fig. 1. Sample and its postheating color changes. (a) Photo of the unheated sample, photos of the sample heated at (b) 1100°C, (c) 1200°C, and (d) 1300°C.

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Fig. 2. Comparison of different UV-VIS absorption spectra of corundum samples before and after heat treatment. (a) UV-VIS absorption spectra of the unheated sample, UV-VIS absorption spectra of the sample heated at (b) 1100°C, (c) 1200°C, and (d) 1300°C.

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Fig. 3. Observed and fitted absorption spectrum of the sapphire sample after it is heated at 1300°C (spectrum range from 490 to 640 nm).

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Fig. 4. Observed and fitted x ray photoelectron spectrometer spectrum of Fe 2p from the surface of the sapphire sample: (a) unheated sample, sample heated at (b) 1100°C, (c) 1200°C, and (d) 1300°C.

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Fig. 5. Observed and fitted x ray photoelectron spectrometer spectrum of Ti 2p from the surface of the sapphire sample: (a) unheated sample, sample heated at (b) 1100°C, (c) 1200°C, and (d) 1300°C.

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Table 1. XRF Testing Results of the Sample (wt.%)
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Table 1. XRF Testing Results of the Sample (wt.%)
$A l_{2} O_{3}$ $C r_{2} O_{3}$ $F e_{2} O_{3}$ $T i O_{2}$ $S i O_{2}$ $C a O$ $G a O$
96.0521 0.8090 1.9665 0.1302 0.3348 0.2788 0.0415

Table 2. X-ray Photoelectron Spectrometer Analysis Results of Fe 2p and Ti 2p Spectrum at Different Temperatures
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Table 2. X-ray Photoelectron Spectrometer Analysis Results of Fe 2p and Ti 2p Spectrum at Different Temperatures
Binding energies (eV) Percentage ( % )
−Unheat −1100°C −1200°C −1300°C
${Fe}^{2 +}$ 711.7 39.62 49.80 58.90 65.35
${Fe}^{3 +}$ 713.6 60.38 50.20 41.10 34.65
${Ti}^{3 +}$ 455.3 51.28 43.74 42.40 8.33
${Ti}^{4 +}$ 458.8 48.72 56.26 57.60 91.67

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Xiaozhen Han, Yan Kang, Xiao Wu, Xueliang Liu, Shouguo Guo, "Study on low-temperature heat treatment of purplish red sapphire," Chin. Opt. Lett. 14, 053001 (2016)

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