At a scientific conference in Sendai, Japan, in early January, researchers led by Dr . Jun Akimitsu of Aoyama-Gakuin University in Tokyo announced that magnesium boride was a superconductor and remained a superconductor at temperatures up to 389 degrees, or about 29 degrees warmer than any other simple metallic compound.
42.
At a scientific conference in Sendai, Japan, in early January, researchers led by Dr . Jun Akimitsu of Aoyama-Gakuin University in Tokyo announced that magnesium boride was a superconductor and remained a superconductor at temperatures up to minus 389 degrees, or about 29 degrees warmer than any other simple metallic compound.
43.
UHTCs generally exhibit thermal expansion coefficients in the range of 5.9 8.3 ?10 " 6 K " 1 . The structural and thermal stability of ZrB 2 and HfB 2 UHTCs results from the occupancy of bonding and antibonding levels in hexagonal MB 2 structures with alternating hexagonal sheets of metal and boride atoms.
44.
Tantalum boride films can be deposited from a gas mixture of TaCl 5-BCl 3-H 2-Ar in the temperature range 540 800 �C . TaB 2 ( single-phase ) is deposited at a source gas flow ratio ( BCl 3 / TaCl 5 ) of six and a temperature above 600 �C . TaB ( single-phase ) is deposited at BCl 3 / TaCl 5 = 2 4 and T = 600 700 �C.
