Binary molybdenum phosphides Mo3P, Mo8P5 and Mo4P3 have been prepared at hi
gh temperatures and high pressures. The resistivity of the phosphides decre
ases with decreasing temperature and sharply drops at low temperatures. The
superconductivity is found at around 7 K for Mo3P, 5.8 K For MO8P5 and 3 K
for Mo4P3.The T-c of the binary molybdenum phosphides decreases with decre
asing density. The compounds Mo8P5 and Mo4P3 are new superconductors. (C) 2
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