Average single bond strength and optical basicity of Na2O-GeO2 glasses
スポンサーリンク
概要
- 論文の詳細を見る
On the basis of the thermodynamical approach proposed by Takahashi and Yoshio the Ge-O single bond strengths BGe-O of GeO6 groups denoted as [GeO6], all bridging GeO4 groups denoted as [GeO4]BO and GeO4 groups with one non-bridging oxygen denoted as [GeO4]-NBO have been determined for xNa2O.(1-x)GeO2 (x = 5-30 mol%) glasses as follows: 323 kJ/mol for [GeO6], 341 kJ/mol for all bridging [GeO4]BO and 460 kJ/mol for [GeO4]-NBO groups. Equation for the calculation of average single bond strengths BM-O of sodium germanate glasses has been suggested taking into account the contribution of different structural units namely [GeO6], [GeO4]BO and [GeO4]-NBO groups. It has been found that the average single bond strength BM-O of sodium germanate glasses decreases up to 267 kJ/mol at 25 mol% Na2O due to the formation of [GeO6] groups and increases up to 282.5 kJ/mol at 30 mol% Na2O due to the formation of [GeO4]-NBO groups. The results support the idea that the formation of [GeO6] groups is probably a main reason for the so-called germanate anomaly. The refractive index based optical basicity Λ(no) is sensitive in relation to the germanate anomaly effect and the group basicity follows the sequence: Λ[GeO4]BO < Λ[GeO6] < Λ[GeO4]-NBO. The observed correlation between Λ(no) and BM-O of sodium germanate glasses has been discussed with the presence of Ge(4)-O-Ge(4), Ge(4)-O-Ge(6) and Ge(4)-O-...Na(6) chemical bonds in the glass structure in which in bracket the coordination number of the cation is given.
- 公益社団法人 日本セラミックス協会の論文
著者
-
Komatsu Takayuki
Department Of Chemistry Nagaoka University Of Technology
-
DIMITROV Vesselin
Department of Silicate Technology, University of Chemical Technology and Metallurgy
関連論文
- Optical characteristics of nanocrystallized glass fiber with second-order optical nonlinearity
- Comprehensive study of crystallization and phase formation in (La,Gd) BGeO_5 glass(Glass and Ceramic Materials for Photonics)
- Correlation between the temperature of molten state and the SH intensity of 30BaO・15TiO_2・55GeO_2 crystallized glass
- Laser-induced line patterning of nonlinear optical β'-Sm[x]Gd[2-x](MoO4)3 molybdate crystals in glass (特集 光機能材料)
- Second-Order Optical Nonlinearity of LaBGeO_5, LiBGe04 and Ba_2TiGe_2O_8 Crystals in Corresponding Crystallized Glasses : Optics and Quantum Electronics
- Crystal growth behavior in CuO-doped lithium disilicate glasses by continuous-wave fiber laser irradiation
- Ferroelectric Properties and Second Harmonic Intensities of Stillwellite-Type (La, Ln)BGeO_5 Crystallized Glasses(Optical Properties of Condensed Matter)
- Promotion of High-T_c Phase in Te-Doped (Bi, Pb)_2Sr_2Ca_2Cu_3O_y Superconductors Prepared by the Melt-Quenching Method
- On the Formation of High-T_c Phase in Mo-Doped (Bi, Pb)_2Sr_2Ca_2Cu_3O_y Superconductors
- Effect of Low-Temperature Annealing on the Coupling at Grain Boundaries in Sb-Doped (Bi, Pb)_2Sr_2Ca_2Cu_3O_y Superconductors
- Effect of Sb Addition on the Formation of High-T_c Phase in the Bi-Pb-Sr-Ca-Cu-O Ceramics
- Creation of Acid Sites on SBA-15 Mesoporous Silica by Alumination
- Superconducting Properties of Bi-Pb-Sr-Ca-Cu-O Ceramics Prepared by the Melt-Quenching Method
- Preparation of High-T_c Superconducting Bi-Pb-Sr-Ca-Cu-O Ceramics by the Melt Quenching Method : Electrical Properties of Condensed Matter
- Effect of Mg Addition on Superconducting Properties of Ba-Y-Cu-O Ceramics Prepared by the Melt Quenching Method : Electrical Properties of Condensed Matter
- Effects of Annealing Conditions on Superconducting Properties of BiCaSrCu_2O_x Ceramics Prepared by the Melt Quenching Method : Electrical Properties of Condensed Matter
- On the New Substrate Materials for High-T_c Superconducting Ba-Y-Cu-O Thin Films : Electrical Properties of Condensed Matter
- On the Reactions of Quenched BaYCuO Powders with Various Materials : Electrical Properties of Condensed Matter
- High-T_c Superconducting Glass Ceramics Based on the Bi-Ca-Sr-Cu-O System : Electrical Properties of Condensed Matter
- Preparation of High-T_c Superconducting Bi-Ca-Sr-Cu-O Ceramics by the Melt Quenching Method : Electrical Properties of Condensed Matter
- Crystalline Phases in Superconductor Ba-Y-Cu-O with High T_c Prepared by Melting Method
- Liquid Quenched Superconductor Ba-Y-Cu-O with T_=88 K and AC Josephson Effect at 77 K
- Fabrication of Eu:SrAl2O4-based glass ceramics using Frozen sorbet method
- Novel Technique for Fabrication of Nanoparticle Structures in KNbO3–TeO2 Glass for Photonic Integrated Circuits
- Ascitic Positive Cytology and Intraperitoneal Metastasis in Ovarian Dysgerminoma
- Hydrothermal Synthesis of a Novel Titanosilicate with MWW Topology
- Nystatin-induced nitric oxide production in mouse macrophage-like cell line RAW264.7
- Paramyxovirus Accessory Proteins as Interferon Antagonists
- Catalytic Properties of Framework Iron in MFI-Type Ferrisilicate for the Oxidative Dehydrogenation of n-Butane
- Average single bond strength and optical basicity of Na2O-GeO2 glasses
- Deformation during Vickers nanoindentation in highly oriented nonlinear optical Ba_2TiGe_2O_8 crystalline layers at glass surface(Fracture and Related Phenomena of Glasses)
- Diffusion Bonding of Bi-Pb-Sr-Ca-Cu-O High-T_c Superconductors
- Fabrication of Ba2TiGe2O8 Thin Film with Optical Nonlinearity
- Spinel-type crystals based on LiFeSiO4 with high electrical conductivity for lithium ion battery formed by melt-quenching method
- Comprehensive study of crystallization and phase formation in (La, Gd)BGeO_5 glass
- Josephson Effects at 77 K in Grain Boundary Bridge Made of Thick Films : Electrical Properties of Condensed Matter
- Origin of Intrinsic Second-Harmonic Generation in Crystallized GeO2–SiO2 Glass Films
- Flavopiridol inhibits lipopolysaccharide-induced TNF-α production through inactivation of nuclear factor-κB and mitogen-activated protein kinases in the MyD88-dependent pathway
- Crystallization and Raman Spectra of Langasite-Type Phases in Glasses of La3Ga5GeO14–Ba3Ga2Ge4O14 System