Local structure, Tg, and IR transparency of potassium titanate glasses and the local structure of calcium titanate ceramics.
スポンサーリンク
概要
- 論文の詳細を見る
The Mössbauer spectrum of <I>x</I>K<SUB>2</SUB>O·(95−<I>x</I>)TiO<SUB>2</SUB>·5Fe<SUB>2</SUB>O<SUB>3</SUB> glasses (<I>x</I>=35–60), consisting of a paramagnetic doublet peak due to tetrahedral Fe<SUP>3+</SUP>, suggests that the Fe<SUP>3+</SUP> is substituted for the tetrahedral Ti<SUP>4+</SUP>. The isomer shift (δ=0.20–0.23 mm s<SUP>−1</SUP>) and the quadrupole splitting (<I>Δ</I>=0.72–0.81 mm s<SUP>−1</SUP>) decrease linearly with the increasing K<SUB>2</SUB>O content. The glass transition temperature (<I>T</I><SUB>g</SUB>) decreases similarly as the <I>Δ</I> does, supporting the "<I>T</I><SUB>g</SUB>−<I>Δ</I> rule" discovered by Nishida et al., i.e., the <I>T</I><SUB>g</SUB> of oxide glasses is expressed by <I>T</I><SUB>g</SUB>=<I>aΔ</I>+<I>b</I>. (The slope "<I>a</I>" is 680 °C mm<SUP>−1</SUP> s.) The IR absorption spectra show two peaks at 880 and 640 cm<SUP>−1</SUP> corresponding to the Ti(Fe)O<SUB>4</SUB> and TiO<SUB>6</SUB> units, respectively. The relative absorption intensity of the Ti(Fe)O<SUB>4</SUB> units becomes higher when the K<SUB>2</SUB>O content increases. The potassium titanate glasses (plate) show IR transparency, having the transmission edge of 5.4 μm. The Mössbauer spectrum of <I>x</I>CaO·(95−<I>x</I>)TiO<SUB>2</SUB>·5Fe<SUB>2</SUB>O<SUB>3</SUB> ceramics (<I>x</I>=5–50) consists of two doublet peaks due to Fe<SUP>3+</SUP> and Fe<SUP>2+</SUP>. Both the δ and <I>Δ</I> of the Fe<SUP>3+</SUP> are constant irrespective of the CaO content, whereas the fraction (relative absorption area) of the Fe<SUP>3+</SUP> decreases linearly from 94 to 75% when the CaO content is increased from 5 to 50 mol%.
- 公益社団法人 日本化学会の論文
著者
-
Yamada Miho
Department Of Agricultural Chemistry Faculty Of Agriculture Hokkaido University
-
Nishida Tetsuaki
Department Of Chemistry Faculty Of Science Kyushu University
-
Takashima Yoshimasa
Department Of Chemistry Faculty Of Science Kyushu University
-
Yamada Miho
Department of Chemistry, Faculty of Science, Kyushu University
-
Yamaguchi Yasuharu
Department of Chemistry, Faculty of Science, Kyushu University
関連論文
- Growth Potencies and Effects on Digestive Functions of an Amino Acid and a Casein Diet in Rats of Three Strains
- Structural Change of the IR-Transmitting Tellurite, Gallate and Aluminate Glasses Caused by the ^Co-Gamma Ray Irradiation
- Some Features in Gel Drying Process and Dehydrated Substances
- Transformation of Egg-White Glass into Partially Crystallized Glass Induced by Heat Treatment and Gamma-Ray Irradiation
- Fluctuation of the Electrical Conductivity Associated with the Glass Transition of xKNO_3・(100-x)Sr(NO_3)_2 Glasses
- Coloration of Fluorophosphate Glasses Containing Fluorescein Molecules by Heat Treatment or Gamma Ray Irradiation
- Lattice Dynamic Study of Semiconducting Bi_2Sr_2Y(Cu_Sn_x)_2O_y by ^Sn-Mossbauer Spectroscopy
- Low-Temperature ^Sn-Mossbauer Study of Superconducting Bi_4Sr_Ca_Cu_4Sn_O_ Ceramic (2212 Phase)
- ^Sn-Mossbauer Study on the Normal Lattice Vibration of Superconducting Bi(Pb)_2Sr_2Ca_2Cu_3Sn_O_
- Precipitation of Mayenite in 60CaO・35Al_2O_3・5Fe_2O_3 Glass Annealed at Several Temperatures Below and Above the Glass Transition Temperature
- Softening of Cu(1)-Site Vibration Matched with the Onset Temperature of Superconducting YBa_2(Cu_Sn_)_3O_
- Correlation between Detrapped Valence States and Molecular Packing of Mixed-Valence Dinuclear Iron(II,III) Complexes of a Septadentate Polypyridine Ligand
- ^Sn-Mossbauer Spectroscopic Study of High-T_c Superconducting YBa_2(Cu_Sn_)_3O_ and the Gamma-Ray Irradiation Effect
- The Arabidopsis FLAKY POLLEN1 Gene Encodes a 3-Hydroxy-3-Methylglutaryl-Coenzyme A Synthase Required for Development of Tapetum-Specific Organelles and Fertility of Pollen Grains
- Detrapped Valence State of Iron(II)-Iron(III) Complexes with Carboxylic Acid
- HIGH SPECIFIC ACTIVITY OF ORGANICALLY BOUND TRITIUM IN PINE NEEDLES AND SEARCH FOR ITS CAUSE IN THE ENVIRONMENT
- TRITIUM CONCENTRATIONS IN NATURAL WATERS IN JAPAN BEFORE USE OF A LARGE QUANTITY OF TRITIUM ON ITS FUSION PROGRAM
- ATMOSPHERIC TRITIUM IN THREE DIFFERENT CHEMICAL FORMS IN FUKUOKA
- The Determinations of Some Metal Ions by Using Hexamminecobalt(III) Chloride and Sodium Thiosulfate as Precipitants
- Production of 53Mn by 52Cr(d, n)Reaction
- Magnetic cross-over in hexa-coordinate iron(II) complexes of several Schiff bases.
- Local structure, Tg, and IR transparency of potassium titanate glasses and the local structure of calcium titanate ceramics.
- Structural study of germanate glasses irradiated with .GAMMA.-rays and thermal neutrons.
- The correlation between the bonding properties of ligands and the irradiation effects of gamma-rays on iron compounds.
- Moessbauer emission spectroscopic study of some spin crossover cobalt(II) complexes.
- Physical Characteristic and Molecular Structure of Spin-Crossover Iron(III) Complexes of Monoclinic Form with Hexadentate Ligands Derived from Triethylenetetramine and Salicylaldehyde (Fe(sal2trien))BPh4acetone.
- Studies of iron(II) complexes with several Schiff bases: New examples of 5T2-1A1 equilibrium.
- Magnetic behavior of spin-crossover iron(III) complexes adsorbed on the surface of silicon dioxide and metal dilution effects on magnetism.
- Intercalation compounds of FeOCl. Systematics of amine containing lewis base intercalants.
- Moessbauer spectroscopic study of danalite, Fe4(BeSiO4)3S.
- Moessbauer spectroscopic study of superconducting Y-Ba-Cu(Fe)-O ceramics and gamma-ray irradiation effect.
- Moessbauer studies of the gamma-ray-irradiation effects of 1,10-phenanthroline compounds.
- Moessbauer and DTA studies on the structure of semiconducting sodium vanadate glasses.