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Journal Articles

Separation in $$varepsilon$$-phase of BiPb alloy under mega-gravity

Okayasu, Satoru; Ono, Masao; Nishio, Taichiro*; Iguchi, Yusuke*; Mashimo, Tsutomu*

Defect and Diffusion Forum, 323-325, p.545 - 548, 2012/04

 Times Cited Count:0 Percentile:0.01

Atomic sedimentation in solid occurs under mega-gravity treatment. As the result, partially melt-growth in $$varepsilon$$-phase of BiPb-alloy occurs. Small difference of densities between fully hcp structure of Bi$$_{3}$$Pb$$_{7}$$ and that of partially defected Bi$$_{3}$$Pb$$_{(7-delta)}$$ are enhanced under mega-gravity, and cause the separation of the $$varepsilon$$-phase. Superconducting properties differs between the separated two phases.

Journal Articles

Mass-dependent isotopic fractionation of a solid tin under a strong gravitational field

Osawa, Takahito; Ono, Masao; Esaka, Fumitaka; Okayasu, Satoru; Iguchi, Yusuke*; Hao, T.; Magara, Masaaki; Mashimo, Tsutomu

EPL; A Letters Journal Exploring the Frontiers of Physics, 85(6), p.64001_1 - 64001_5, 2009/03

 Times Cited Count:6 Percentile:41.75(Physics, Multidisciplinary)

Pure tin metals were centrifuged at 1$$times$$$$10^6$$ $$g$$ and at 220 $$^{circ}$$C for 100 hours, 0.40$$times$$$$10^6$$ $$g$$ at 220-230 $$^{circ}$$C for 24 hours, and 0.25$$times$$$$10^6$$ $$g$$ at 220 $$^{circ}$$C for 24 hours. Their isotopic compositions were measured by a secondary ion mass spectrometer (SIMS). $$^{116}$$Sn/$$^{120}$$Sn and $$^{124}$$Sn/$$^{120}$$Sn ratios of the 1.02$$times$$$$10^6$$ $$g$$ sample were considerably different than the initial compositions, and the magnitude of isotopic fractionation reached 2.6%. A three-isotope diagram of $$^{116}$$Sn/$$^{120}$$Sn versus $$^{124}$$Sn/$$^{120}$$Sn shows conclusively that isotopic fractionation caused by a gravitational field depended only on isotopic mass.

Oral presentation

Vortex state in gradient composite superconductor prepared in mega-gravity field, 2

Okayasu, Satoru; Ono, Masao; Nishio, Taichiro*; Iguchi, Yusuke*; Mashimo, Tsutomu

no journal, , 

no abstracts in English

Oral presentation

Vortex state in gradient composite superconductor Bi-Pb prepared in mega-gravity field

Okayasu, Satoru; Ono, Masao; Nishio, Taichiro*; Iguchi, Yusuke*; Mashimo, Tsutomu

no journal, , 

Sedimentation of atoms can be caused under mega-gravity field even in solid. A composition-graded structure can be formed with the preparation in multi-component condensed matter. In this study, we performed a mega-gravity preparation (1$$times$$10$$^{6}$$ G, 130$$^{circ}$$C, 100h) on a thin plate sample (0.7mm in thickness) of intermetallic superconducting compound Bi$$_{3}$$Pb$$_{7}$$. After the preparation, a visible four-layered structure appeared indicating different microscopic structures. In the mid two layers, the composition-graded structures were achieved. To investigate the superconducting states of each layer, direct vortex observations are accomplished for each layer with a scanning SQUID microscope. No vortex can be observed in the one of the composition-graded layer at higher gravity region. On the other hand, vortices can penetrate into other three layers. Each layer shows different superconducting property. We discuss the differences of the vortex states at the individual layers.

Oral presentation

Superconductivity of compositional-graded material treated by Mega-gravtronics

Okayasu, Satoru; Iguchi, Yusuke*; Ono, Masao; Nishio, Taichiro*; Mashimo, Tsutomu

no journal, , 

A homogeneous Bi-Pb alloy was treated under mega-gravity field. Sedimentation and associated crystallization occurred during the process. The compositional graded superconducting alloy is obtained. The superconductivity parallel to gravity is Pb, and perpendicular to gravity is Bi$$_{3}$$Pb$$_{7}$$.

Oral presentation

Vortex states on a compositinal graded superconductor treated under a mega gravity process

Okayasu, Satoru; Ono, Masao; Nishio, Taichiro*; Nakai, Noriyuki; Hayashi, Nobuhiko*; Machida, Masahiko; Iguchi, Yusuke*; Mashimo, Tsutomu*

no journal, , 

In high gravitational fields up to one million G, sedimentation of cecompositional atoms may occur even in solid. An In-Pb alloy sample (In:Pb=8:2) was prepared under a mega-gravity (1.02 MG) circumstance at 125$$^{circ}$$C for 100 hours. After the maga-gravity treatment, an atomic scaled compositionally graded structure is formed in entire sample. A sample with continuously varying superconducting transition temperatures Tc is obtained. The effect of the varying Tc on vortices is investigated using a scanning SQUID microscope.

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