Coloration changes in natural ruby induced by oxygen ion implants correlated with cathodoluminescence data

Tengchaisri, T.; Bootkul, D.; Intarasiri, S.; Tippawan, U.; Kuznetsov, A. Yu.

doi:10.1016/j.nimb.2021.06.002

Cited by 2 publications

(2 citation statements)

References 34 publications

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“…Ideally, further studies of the spectra should be conducted because it is routine to perform several investigations of the CL spectra of Al 2 O 3 . [37][38][39][40][41] Nevertheless, because the use of the present CL equipment is relatively convenient, CL mapping can be used to observe the inhomogeneous distribution of corundum (α-Al 2 O 3 ) rapidly.…”

Section: Imaging Of Distribution Of α-Al 2 Omentioning

confidence: 99%

Characterization of α-Al2O3 in Structural Isomers of Alumina Formed by Oxidation of Fe–Cr–Al Alloys

et al. 2022

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To understand the formation of structural isomers of alumina (Al 2 O 3 ) on the surfaces of Fe-Cr-Al alloys, cathodoluminescence (CL), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD) were used. The alloys were annealed under oxygen at a low partial pressure to focus on the initial formation of Al 2 O 3 . XRD revealed that corundum (α-Al 2 O 3 ) was predominantly formed on the alloy surfaces after annealing at approximately 1 100°C, whereas γ-Al 2 O 3 and θ-Al 2 O 3 were formed at 1 000°C. CL peaks around 700 nm, which originated from Cr 3 + ions in Al 2 O 3 , was drastically increases by rising the annealing temperatures from 1 000 to 1 100°C because of the increase of the chromium content in the Al 2 O 3 scales that was revealed by XPS. EPMA revealed that the surficial α-Al 2 O 3 had striped patterns, which were similar to those observed using CL imaging, indicating that CL can be conveniently used for imaging α-Al 2 O 3 and analyzing the inhomogeneous distribution of α-Al 2 O 3 on the alloys.

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Section: Imaging Of Distribution Of α-Al 2 Omentioning

confidence: 99%

Characterization of α-Al2O3 in Structural Isomers of Alumina Formed by Oxidation of Fe–Cr–Al Alloys

et al. 2022

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“…Most natural rubies show uneven color saturation, sometimes with bands of blue color. To overcome these issues, various processing methods have been developed, such as heat treatment [2], glass-filled [3], ion implantation [4], etc. Heat treatment is one of the earliest methods used to improve the color, clarity and value of rubies.…”

Section: Introductionmentioning

confidence: 99%

Chemical and Spectral Variations between Untreated and Heat-Treated Rubies from Mozambique and Madagascar

Sun

Qin³

2022

Minerals

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The chemical composition and spectra of untreated and heat-treated rubies from Mozambique and Madagascar were analyzed by an electron probe microscopy analysis, laser ablation inductively coupled plasma quadrupole mass spectrometry, Fourier transform infrared spectroscopy, Raman spectroscopy and UV-visible spectroscopy. Due to the different content of Fe and different inclusions, rubies from Madagascar belong to alkaline basalt deposit, while rubies from Mozambique belong to amphibole metamorphic rock. The ruby samples were heated to 900 °C to change their color. As Fe and Ti ions can be transferred into different valences and diffused into the interior of rubies, Cr ions in cracks or cleavages entered the crystal lattice during heat treatment and the content of Fe and Ti decreased, while the content of Cr increased in heat-treated rubies. After heating, blue-purple decreased and the red hue increased, while the blue color band disappeared and yellow appeared in the cracks of the samples because of the chemical changes. Compared with untreated rubies, the infrared absorption peaks of 2123 cm−1 and 1990 cm−1 related to inclusions disappeared, and the existence of 3236 cm−1 and 3186 cm−1 absorption peaks was a typical characteristic of heat-treated ruby, which was produced by changes in its inclusion. In addition, due to the weakened charge transfer of Fe2+ and Ti4+ and the increasing reaction of Fe2+ → Fe3+ along with the heat treatment, the UV-visible absorption peak at 400 nm shifted to purple.

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Coloration changes in natural ruby induced by oxygen ion implants correlated with cathodoluminescence data

Cited by 2 publications

References 34 publications

Characterization of <i>α</i>-Al<sub>2</sub>O<sub>3</sub> in Structural Isomers of Alumina Formed by Oxidation of Fe–Cr–Al Alloys

Characterization of <i>α</i>-Al<sub>2</sub>O<sub>3</sub> in Structural Isomers of Alumina Formed by Oxidation of Fe–Cr–Al Alloys

Chemical and Spectral Variations between Untreated and Heat-Treated Rubies from Mozambique and Madagascar

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