Y. Tahara, K. Oki, 田原 良信, 沖 憲典, ヨシノブ タハラ, ケンスケ オオキ
Kinetics of ordering in B2-type FeCo alloy was investigated both experimentally and theoretically. Kinetic equation for B2-type ordering was generaily derived from the two physical conditions, namely the symmetry between two sublattices in the B2--type structure and the stability of the equilibrium state. The general kinetic equation with third order term of the degree of order has an advantage over the others in that it is simpler in form and more general, and it is applicable to the analysis of the kinetic behavior on ordering in B2-type alloys. The variation of lattice constant on isothermal ordering for the equiatomic FeCo alloy was observed by X-ray` diffraction, and analyzed using present kinetic equation. Isothermal change of lattice constant above 823K was reproduced well by the equation, but not satisfactorily below 773K, particularly about a two-step change of lattice constant observed at an early stage of annealing. This two--step change was interpreted very well by the extended kinetic equation containing the vacancy concentration. The values for the formation and migration energies of vacancies in the FeCo alloy were determined as 91 and 139 kJ/mol, respectively.
{"title":"Kinetic Behavior of Ordering in B2-type Alloys","authors":"Y. Tahara, K. Oki, 田原 良信, 沖 憲典, ヨシノブ タハラ, ケンスケ オオキ","doi":"10.15017/17719","DOIUrl":"https://doi.org/10.15017/17719","url":null,"abstract":"Kinetics of ordering in B2-type FeCo alloy was investigated both experimentally and theoretically. Kinetic equation for B2-type ordering was generaily derived from the two physical conditions, namely the symmetry between two sublattices in the B2--type structure and the stability of the equilibrium state. The general kinetic equation with third order term of the degree of order has an advantage over the others in that it is simpler in form and more general, and it is applicable to the analysis of the kinetic behavior on ordering in B2-type alloys. The variation of lattice constant on isothermal ordering for the equiatomic FeCo alloy was observed by X-ray` diffraction, and analyzed using present kinetic equation. Isothermal change of lattice constant above 823K was reproduced well by the equation, but not satisfactorily below 773K, particularly about a two-step change of lattice constant observed at an early stage of annealing. This two--step change was interpreted very well by the extended kinetic equation containing the vacancy concentration. The values for the formation and migration energies of vacancies in the FeCo alloy were determined as 91 and 139 kJ/mol, respectively.","PeriodicalId":11722,"journal":{"name":"Engineering sciences reports, Kyushu University","volume":"4 1","pages":"161-170"},"PeriodicalIF":0.0,"publicationDate":"1988-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82450223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Tashiro, Takezaki Yoshinori, M. Takeshita, A. Tsuge, T. Yamato, 田代 昌士, 竹崎 義則, 竹下 道範, 顕彦 柘植, 大和 武彦
{"title":"Metacyclophane and Related Compounds. 22. Bromination of 8,16-Dimethyl-5-nitro[2.2]metacyclophane with Bromine and N-Bromosuccinimide","authors":"M. Tashiro, Takezaki Yoshinori, M. Takeshita, A. Tsuge, T. Yamato, 田代 昌士, 竹崎 義則, 竹下 道範, 顕彦 柘植, 大和 武彦","doi":"10.15017/17721","DOIUrl":"https://doi.org/10.15017/17721","url":null,"abstract":"","PeriodicalId":11722,"journal":{"name":"Engineering sciences reports, Kyushu University","volume":"9 1","pages":"175-179"},"PeriodicalIF":0.0,"publicationDate":"1988-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85192948","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The electrical conductivity is one of the most important parameters governing the performance of an MHD power generator. The far-infrared laser has offered a powerful diagnostic tool for measuring this quantity. The conductivity of seeded flame is obtained by measuring the transmissivity of the FIR laser beam through a flame. However, care should be taken for the transmissivity measurement because the laser beam is refracrted and expands in the flame due to the electrons. In the present paper, a method involving integrating beam intensity profiles is suggested to account for this effect. The measured conductivity with this correction agrees very well with the theoretical calculation.
{"title":"赤外線レーザによる MHD 燃焼プラズマ導電率の高精度測定","authors":"浩典 中牟田, 益田 光治, 渡辺 征夫, 池上 知顕, 赤崎 正則","doi":"10.15017/17696","DOIUrl":"https://doi.org/10.15017/17696","url":null,"abstract":"The electrical conductivity is one of the most important parameters governing the performance of an MHD power generator. The far-infrared laser has offered a powerful diagnostic tool for measuring this quantity. The conductivity of seeded flame is obtained by measuring the transmissivity of the FIR laser beam through a flame. However, care should be taken for the transmissivity measurement because the laser beam is refracrted and expands in the flame due to the electrons. In the present paper, a method involving integrating beam intensity profiles is suggested to account for this effect. The measured conductivity with this correction agrees very well with the theoretical calculation.","PeriodicalId":11722,"journal":{"name":"Engineering sciences reports, Kyushu University","volume":"47 1","pages":"211-215"},"PeriodicalIF":0.0,"publicationDate":"1988-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85005116","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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