Effect of Mn doping on the growth and properties of enstatite single crystals

Catalano, Manuela; Bloise, Andrea; Pingitore, V.; Miriello, Domenico; Cazzanelli, E.; Giarola, Marco; Mariotto, G.; Barrese, E.

doi:10.1002/crat.201400102

Cited by 7 publications

(9 citation statements)

References 26 publications

(32 reference statements)

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“…Synthetic enstatite peak positions and widths are estimated from Catalano et al. (). Uncertainties are 1 SD in the fit coefficients for fits of 20–30 Raman spectra.…”

Section: Resultsmentioning

confidence: 99%

“…Differences in crystal sizes and the presence of impurities also have an impact on Raman peak width (Miyamoto and Ohsumi ; Catalano et al. ). To minimize (or exclude) the interference of compositional variations, crystallite size, and impurities, we targeted samples with almost pure enstatite (maximum Fs is 4.9 mole% in SaU 559) and collected spectra from 20–30 random points from each sample.…”

Section: Methodsmentioning

confidence: 99%

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Raman spectroscopy of shocked enstatite‐rich meteorites

Zhang

Shieh

Withers

et al. 2018

Meteorit & Planetary Scien

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We present Raman patterns of enstatite in different classes of enstatite‐rich chondrites and achondrites of various shock levels as previously reported from petrographic observations and X‐ray diffraction analyses. Thin sections or mineral separates of four enstatite chondrites (LaPaz Icefield [LAP] 02225, MacAlpine Hills [MAC] 02837, Pecora Escarpment [PCA] 91020, and Itqiy), three aubrites (Larkman Nunatak [LAR] 04316, Khor Temiki, and Allan Hills [ALH] 84008), and a ureilite (Sayh al Uhaymir [SaU] 559) were examined by laser Raman spectroscopy. We find that the frequencies of fundamental Raman peaks of enstatites from the chondrites and aubrites deviate by ≤2 cm−1 from the values for unshocked enstatite. This small difference implies a negligible effect of shock metamorphism on peak positions. Significant differences (<6 cm−1) for peak positions are found for the pyroxenes of SaU 559 and may be attributed to minor substitution of Fe and Ca for Mg. Linear regressions of peak widths of enstatite chondrites against their established shock stages show a strong positive correlation for each mode (r2 > 0.94). From this linear relationship, the 343 and 1014 cm−1 peaks of the aubrites coincide with S4 determined from petrography. For Itqiy, we find S4–5, while the shock levels of SaU 559 exceed the petrologic scheme (S1–6), suggesting that the ureilite might have sustained multiple shock events or have been deformed in a high‐pressure environment. Alternatively, for Itqiy (peak 343 cm−1) and SaU 559 (all peaks) enstatites, minor substitutions of Fe and Ca for Mg may have further broadened their peak widths.

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“…Synthetic enstatite peak positions and widths are estimated from Catalano et al. (). Uncertainties are 1 SD in the fit coefficients for fits of 20–30 Raman spectra.…”

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Raman spectroscopy of shocked enstatite‐rich meteorites

Zhang

Shieh

Withers

et al. 2018

Meteorit & Planetary Scien

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“…The difference of color tone in the CL such as red-purple (Sri1) and bluish-purple (Sri2) should depend on the ratio between blue and red emissions in enstatite. A red emission at around 670 nm in the synthetic enstatite is assigned to an impurity center derived from activated Mn 2+ substituted for Mg as an electron transition of 4 T 1g (G) → 6 A 1g (S) (Catalano et al, 2014). This electron transition similar to those in olivine and calcite is affected by the crystal field of the ligant oxygens coordi- nated to the host Mn ion (Marfunin, 1979;Götze et al, 1999).…”

Section: +mentioning

confidence: 93%

“…Terrestrial enstatite (Sri2) has two emission components related to impurity centers of Cr 3+ at 1.70 eV and Mn 2+ at 1.85 eV in a red region by referring to the results of the synthetic samples (e.g., Steele, 1988;Catalano et al, 2014), and two components at 2.72 and 3.10 eV in a blue region (Fig. 3), whereas extraterrestrial enstatite (Y-86004) has a characteristic component at 3.86 eV in a near-UV region in addition to those obtained in terrestrial one (Fig.…”

Section: +mentioning

confidence: 99%

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Cathodoluminescence characterization of enstatite

Ohgo

Nishido

Ninagawa

2015

Journal of Mineralogical and Petrological Sciences

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Enstatite in meteorite shows various emissions of cathodoluminescence (CL), and CL emission in terrestrial enstatite has been confirmed in this study. The CL spectra of these enstatite exhibit two broad emission bands at around 400 nm in a blue region and at around 670 nm in a red region. The emission components obtained by a spectral deconvolution can be assigned to impurity centers of Cr 3+ (1.70-1.75 eV) and Mn 2+ (1.85-1.90 eV) and to three defect centers (2.72-2.75, 3.18, and 3.87 eV). The emission component at 3.18 eV might be associated to the defect center derived from structural distortion by the substitution of Al for Si in a tetrahedral site. Extraterrestrial enstatite gives a characteristic emission at 3.87 eV in a blue to UV region, which is not detected in the terrestrial enstatite, suggesting radiation-induced defect by cosmic rays.

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