Yukio Inokuti

A Study of the Mössbauer Effect during the Tempering of Iron-Carbon Martensite

The Mossbauer effect of 57 Fe in the iron-carbon martensite steels was measured during their tempering process, and the appearance of the e -, χ- and cementite phases and the bonding nature in them were studied. It was clarified that the χ-carbide is formed at the tempering stage III a, the formation of which had not been fully proved in previous X-ray or magnetic measurements. It was also concluded that the electronic states of the iron atoms co-ordinating the carbon atoms in the martensite and the e -carbide formed in the stage I are substantially the same, suggesting that the motive force in the stage I is mainly the relaxation of the large strain energy in tne martensite structure. The observed localized and additive nature of the iron-carbon interaction, which was concluded from the linear relation between the amount of the internal field reduction and the number of carbon co-ordination for iron atoms in the various phases, seems to indicate that the Alexander-Anderson-Moriyas idea is applicable to ...

High Pressure Melting of General Compounds, and with Some Physical Models

New information has been appended to our melting hypothesis, proposing that any solid, even if they are not at high temperature, can be melted easily when an extremely high pressure was applied upon them. Our previous hypothesis involves another concept that a solid having a larger mass number can be melted under a relatively lower pressure, whereas that having smaller mass number under quite a high pressure. The rule has recently been confirmed to be valid not only in the simple elements in which it was found, but also applicable to various compounds studied. Experimental data have been summarized together with several theories recently proposed during and after our publication. The aim of this review is first to investigate which theory of them all fits best the experimental facts and secondly to stimulate discussions in order to invoke many alternative theories.

Jupiter's Conductive Molten Core of Moderate Temperature

Recently is was proposed that any solid possesses the melting point T m whose d T m /d P is positive in the beginning of the applied pressure, but becomes negative on further increasing pressure, resulting in a maximum T m characteristic for the material. The new hypothesis involves another concept that a solid having a larger mass number has a relatively lower maximum T m , whereas that having a smaller mass number has a higher maximum T m . It was also assumed that the metallic hydrogen is the lightest alkali metals belonging to the I - A group of the periodic table, and that the maximum melting point of the metallic hydrogen can be determined by extrapolating melting data of Cs, Rb, K, Na and Li successively. Then, There is a possibility that the Jupiter may possess a relatively cool molten metallic hydrogen core, whose temperature is definitely lower than estimated by DeMarcus.