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Journal Articles

Experimental determination of phase equilibria in the Mn-Zn binary system

Imatomi, Daisuke*; Ishikawa, Ryosuke*; Nakata, Akira*; Ito, Tatsuya; Han, K.*; Nagasako, Makoto*; Xu, X.*; Omori, Toshihiro*; Kainuma, Ryosuke*

Journal of Phase Equilibria and Diffusion, 45(1), p.3 - 17, 2024/02

 Times Cited Count:1 Percentile:16.17(Chemistry, Physical)

Phase equilibria in the Mn-Zn binary system were experimentally determined by chemical composition examination, crystal structure determination, and thermal analysis. Major changes were detected for the $$beta$$, $$varepsilon$$, and $$delta$$ phases. The $$beta$$-B2 single-phase region could not be confirmed in the studied system because a disordered body-centered cubic structure, which is identical to the $$delta$$Mn phase, was confirmed in a quenched sample from the previously proposed region of $$beta$$ phase. The $$varepsilon$$ phase has been controversial whether the phase is separated into $$varepsilon$$, $$varepsilon_{1}$$, and $$varepsilon_{2}$$ phases or not. By studying a diffusion couple and several alloy compositions, it was established that the $$varepsilon$$, $$varepsilon_{1}$$, and $$varepsilon_{2}$$ phases are not separate and comprise a single $$varepsilon$$ phase. Furthermore, the $$delta$$ phase is not present in the Zn-rich region of the system because the corresponding invariant reactions were not detected via thermal analysis.

Journal Articles

Measurement of self-diffusion coefficients in Li ionic conductors by using the short-lived radiotracer of $$^8$$Li

Jeong, S.-C.*; Katayama, Ichiro*; Kawakami, Hirokane*; Watanabe, Yutaka*; Ishiyama, Hironobu*; Imai, Nobuaki*; Hirayama, Yoshikazu*; Miyatake, Hiroari; Sataka, Masao; Okayasu, Satoru; et al.

Journal of Phase Equilibria and Diffusion, 26(5), p.472 - 476, 2005/09

Authors developed a radiotracer method for diffusion studies in solids. The experimental test was performed by the measurement of the diffusion coefficients of Li in a sample of the compound $$beta$$LiAl using an $$alpha$$-emitting radiotracer of $$^8$$Li(T$$_{1/2}$$ = 0.84 s). It was found that the time-dependent yields of the alpha particles from the diffusing 8Li that was initially implanted in the sample could be used as a measure of the diffusivity of the tracer in a nondestructive way. The method was applied to measure the self-diffusion coefficients of Li in $$beta$$LiGa, and for investigating how the Li diffusion in the Li ionic conductors is affected by the concentration of atomic defects.

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