Zobrazeno 1 - 10
of 83
pro vyhledávání: '"Masato Murakami"'
Publikováno v:
Journal of Superconductivity and Novel Magnetism. 34:1297-1301
We successfully refined a cheap commercial boron powder by means of high-energy ultra-sonication and utilized it in synthesis of bulk MgB2. Rietveld phase analysis of X-ray diffraction pattern revealed completely formed MgB2 with a low amount of MgO.
Autor:
Muralidhar Miryala, Nurhidayah Mohd Hapipi, Masato Murakami, Mohd Mustafa Awang Kechik, Oon Jew Lee, Sai Srikanth Arvapalli, Kar Ban Tan, Soo Kien Chen
Publikováno v:
Ceramics International. 46:23041-23048
In this work, magnesium diboride, MgB2 samples were prepared by using magnesium, Mg powder and carbon-encapsulated boron, B powder (1.35 wt% carbon) with addition of dysprosium oxide, Dy2O3 and lanthanum oxide, La2O3 as dopants. Different weight perc
Publikováno v:
IEEE Transactions on Applied Superconductivity. 29:1-4
In this work, we report an optimum amount of Mg precursor required for obtaining high critical current density (J c ) of bulk MgB 2 superconductor synthesized via solid state sintering. We add a slight excess of Mg precursor to balance its losses whi
Publikováno v:
IEEE Transactions on Applied Superconductivity. 29:1-4
To find a cheap and efficient way to produce high-performance bulk MgB2 superconductors, a series of samples produced with different contents of carbon-coated, nanometer-sized amorphous boron was prepared to improve the magnetic properties. A single-
Publikováno v:
Journal of Superconductivity and Novel Magnetism. 32:1891-1895
MgB2 bulks were produced by in situ solid-state reaction in Ar gas using high-purity commercial powders of Mg metal and amorphous nano-B mixed in a fixed ratio of Mg:B = 1:2. Single-phase materials have been obtained and grain structure and its impli
Autor:
Kotaro Kitamoto, Miryala Muralidhar, Michael Rudolf Koblischka, Masato Murakami, Milos Jirsa, Masaki Higuchi
Publikováno v:
IEEE Transactions on Applied Superconductivity. 28:1-5
The object of this investigation is to improve the flux pinning and critical current density (J c ) of bulk MgB 2 materials for daily applications including superconducting permanent magnets. We prepared two sets of bulk MgB 2 materials employing com
Publikováno v:
Journal of Superconductivity and Novel Magnetism. 35:325-325
Publikováno v:
Materials Science and Engineering: B. 265:115030
Recently, novel low cost techniques have been employed to improve critical current density of MgB2. Ultra-sonication is one such technique. We report on the influence of hexane dispersant on particle size of ultra-sonicated cheap commercial boron and
Publikováno v:
IEEE Transactions on Applied Superconductivity. 27:1-4
In this study, we report on a further improvement of the critical current density of the sintered bulk MgB 2 material utilizing the optimized sintering temperature combined with a varying content of carbon in carbon-encapsulated boron. The MgB 2 bulk
Publikováno v:
Superconductor Science and Technology. 33:115009
Critical current density, J c, in superconductors is strongly connected with size of defects in the material. Frequently, the smaller defects, the higher J c. In this work, we tried to reduce the size of cheap commercial boron precursor powder using