Shozo Kishimoto
Kobe University
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Featured researches published by Shozo Kishimoto.
Acta Metallurgica | 1983
Ted B. Flanagan; W.A. Oates; Shozo Kishimoto
Abstract Thermodynamic equations are derived relating the solvus properties of metal-hydrogen interstitial solutions which form hydride phases to single phase and two solid phase thermodynamic parameters and to standard thermodynamic reaction parameters. The role of non-ideality is examined. The influences of stress, alloying and traps on solvus properties are discussed.
Journal of The Less Common Metals | 1982
Shozo Kishimoto; W.A. Oates; Ted B. Flanagan
Abstract It is known from thermodynamic arguments that solvus determinations can be employed for the evaluation of standard thermodynamic parameters for hydride precipitation from the dilute solution in the limit as the solvus composition tends to zero. In this research a detailed experimental evaluation was made of the actual experimental conditions under which solvus data can be considered to be close enough to the limiting infinitely dilute composition to extract useful standard thermodynamic data for the precipitation reaction. Detailed solvus and thermodynamic data are presented for Pd-H (200–273 K). The effects of alloying palladium on its solvus properties are examined. Substitutional silver increases the stability of the hydride phase and rhodium decreases its stability relative to the gaseous state, but both elements are found to decrease hydride stability relative to the dilute phase. The effect of non-ideality is greater for the alloys than for Pd-H in the same temperature range. The effect of non-ideality on the solvus properties of the alloys is evaluated.
Journal of the Chemical Society, Faraday Transactions | 1986
Shozo Kishimoto; Minoru Inoue; Noritetsu Yoshida; Ted B. Flanagan
Solubility enhancements have been observed for hydrogen in thin Pd films (250–820 A) in the αphase. Thermodynamic data for the films are determined from isotherms at temperatures between 25 and –40 °C and are compared with those for bulk Pd. From the values of WH—H(interaction energy of hydrogen in the film) and the solvus behaviour, it is suggested that the hydride phase in the films is destabilized relative to the dilute phase as the film thickness decreases. The dependence of the solubility on annealing has been examined for a thin film. The results indicate that the special characteristics of thin films disappear after annealing at ca. 400 °C.
Scripta Metallurgica Et Materialia | 1994
Shozo Kishimoto; Noritetsu Yoshida; T. Hiratsuka; A. Nakano; T. Masui; Ted B. Flanagan
The purpose of this communication is to determine whether the solubility enhancements for cold-worked Pd-Ni alloys increase or decrease with atom fraction of Ni. Substitutional Ni atoms contract and Pd lattice, in contrast to the lattice expansion resulting from substitutional Ag in Pd. The Pd-Ni alloy system forms a continuous series of fcc solid solution alloys over the whole composition range. The solubility enhancements will also be determined for a series of homogeneous, ternary Pd[sub 1[minus]x]Ni[sub 1/2x]Ag[sub 1/2x] alloys for x in the range from 0 to 0.2. For this series of ternary alloys the fcc lattice parameters do not change significantly from that of pure Pd. The alloys used in this research were purchased from Tanaka Kikinzoku Kogyo K.K. The detailed experimental procedure has been described previously. The alloys were all deformed by cold-rolling ca 90%. Both the binary and ternary alloys showed only single sets of fcc lattice parameters corresponding to homogeneous fcc solid solutions.
Journal of the Chemical Society, Faraday Transactions | 1989
Shozo Kishimoto; Noritetsu Yoshida; Tadashi Tanabe; Ted B. Flanagan
The absorption of hydrogen in evaporated Pd–Ag (5–7 atom % Ag) films with thicknesses of 360, 1150 and 2160 A has been studied volumetrically from –40 °C to room temperature. Thermodynamic parameters in the range of the α-phase have been determined for the films and are compared with those for bulk alloys. It is found that the hydrogen solubilities in the films are larger than in the bulk alloys, and these tend to increase with decreasing film thickness. The absolute values of WHH(the interaction energy of dissolved hydrogen) for the films are much smaller than those for the bulk alloys, and these values are found to increase with an increase in the film thickness. It is suggested that the solubility enhancement in the α-phase and the weakening of H–H interactions are mainly caused by stresses which are created during the deposition of the films.
Perspectives in Hydrogen in Metals#R##N#Collected Papers on the Effect of Hydrogen on the Properties of Metals and Alloys | 1986
Ted B. Flanagan; W.A. Oates; Shozo Kishimoto
Thermodynamic equations are derived relating the solvus properties of metal-hydrogen interstitial solutions which form hydride phases to single phase and two solid phase thermodynamic parameters and to standard thermodynamic reaction parameters. The role of non-ideality is examined. The influences of stress, alloying and traps on solvus properties are discussed.
Bulletin of the Chemical Society of Japan | 1985
Noriyuki Sotani; Noritetsu Yoshida; Yukio Yoshioka; Shozo Kishimoto
Bulletin of the Chemical Society of Japan | 1984
Noriyuki Sotani; Noritetsu Yoshida; Yoji Kawamoto; Shozo Kishimoto; Masatomo Hasegawa
Scripta Metallurgica | 1982
Ted B. Flanagan; W.A. Oates; Shozo Kishimoto
ChemInform | 1990
Shozo Kishimoto; Noritetsu Yoshida; Yoshitaka Arita; Ted B. Flanagan