Classification of Simple Oxides: A Polarizability Approach

Dimitrov, V.; Komatsu, Takayuki

doi:10.1006/jssc.2001.9378

Cited by 414 publications

(172 citation statements)

References 46 publications

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“…The refraction index of samples A and B differ by %5% which is about the ratio between the polarizabilities of the samples considering the relative amount of Bi 2 O 3 and GeO 2 , in agreement with Ref. 25. We also notice that the linear absorption coefficient of sample B is smaller than the absorption coefficient of sample A, in accordance with Ref.…”

Section: Resultssupporting

confidence: 92%

Nonlinear optical properties of Bi2O3-GeO2 glass at 800 and 532 nm

Oliveira¹,

Falcão-Filho²,

Araújo³

et al. 2013

Journal of Applied Physics

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The nonlinear (NL) optical properties of glassy xBi 2 O 3 -(1Àx) GeO 2 with x ¼ 0.72 and 0.82 were investigated. The experiments were performed with lasers at 800 nm (pulses of 150 fs) and 532 nm (pulses of 80 ps and 250 ns). Using the Kerr gate technique, we observed that the NL response of the samples at 800 nm is faster than 150 fs. NL refraction indices, jn 2 j % 5 Â 10 À16 cm 2 /W, and two-photon absorption coefficients, a 2 , smaller than 0.03 cm/GW, were measured at 800 nm. At 532 nm, we measured the NL transmittance of the samples. From the results obtained, we determined a 2 %1 cm/GW and excited-state absorption cross-sections of %10 À22 cm 2 due to freecarriers. V C 2013 AIP Publishing LLC. [http://dx

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Section: Resultssupporting

confidence: 92%

Nonlinear optical properties of Bi2O3-GeO2 glass at 800 and 532 nm

Oliveira¹,

Falcão-Filho²,

Araújo³

et al. 2013

Journal of Applied Physics

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“…However, they found several different correlations between OB and average EN of the glasses depending on the composition. The separation of validity ranges for their linear fit equations seems somewhat arbitrary, but to an extent corresponds to the three groupings of oxides (I, II, and III) as described by Dimitrov and Komatsu (2002) which takes into account various factors as summarized in Table B.5. In any case, the three relations give values that bin the OB of the glass into three ranges.…”

Section: B10mentioning

confidence: 99%

Optical Basicity and Nepheline Crystallization in High Alumina Glasses

Rodriguez¹,

McCloy²,

Schweiger³

et al. 2011

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SummaryThe purpose of this study was to find compositions that increase waste loading of high-alumina wastes beyond what is currently acceptable while avoiding crystallization of nepheline (NaAlSiO 4 ) on slow cooling. Nepheline crystallization has been shown to have a large impact on the chemical durability of high-level waste glasses. It was hypothesized that there would be some composition regions where high-alumina would not result in nepheline crystal production, compositions not currently allowed by the nepheline discriminator.Optical basicity (OB) and the nepheline discriminator (ND) are two ways of describing a given complex glass composition. This report presents the theoretical and experimental basis for these models. They are being studied together in a quadrant system as metrics to explore nepheline crystallization and chemical durability as a function of waste glass composition. These metrics were calculated for glasses with existing data and also for theoretical glasses to explore nepheline formation in Quadrant IV (passes OB metric but fails ND metric), where glasses are presumed to have good chemical durability. Several of these compositions were chosen, and glasses were made to fill poorly represented regions in Quadrant IV.To evaluate nepheline formation and chemical durability of these glasses, quantitative X-ray diffraction (XRD) analysis and the Product Consistency Test were conducted. A large amount of quantitative XRD data is collected here, both from new glasses and from glasses of previous studies that had not previously performed quantitative XRD on the phase assemblage.Appendix A critically discusses a large dataset to be considered for future quantitative studies on nepheline formation in glass. Appendix B provides a theoretical justification for choice of the oxide coefficients used to compute the OB criterion for nepheline formation.v

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“…The density values show that the glass becomes more rigid and compact as niobium is introduced in the composition. This may be due to the fact that ionic radii of cations are in the order Bi 3+ > Nb 5+ > Ge 4+ [10]. Also the polarizing strength of niobium ion is less than that of bismuth ion but greater than Ge 4+ [10,11].…”

Section: Density and Molar Volumementioning

confidence: 99%

“…This may be due to the fact that ionic radii of cations are in the order Bi 3+ > Nb 5+ > Ge 4+ [10]. Also the polarizing strength of niobium ion is less than that of bismuth ion but greater than Ge 4+ [10,11]. These factors may result in change in coordination polyhedra of the network.…”

Section: Density and Molar Volumementioning

confidence: 99%