YTTRIUM BARIUM COPPER OXIDE

Description

Yttrium barium copper oxide (YBCO) is a crystalline compound with important property of high temperature superconductor above the boiling point (77 K) of liquid nitrogen. YBCO is sensitive to air and moisture. Exposures to YBCO have been reported to cause skin irritation, serious eye irritation, and respiratory irritation. Symptoms of systemic copper poisoning may include capillary damage, headache, cold sweat, weak pulse, kidney and liver damage, central nervous system excitation followed by depression, jaundice, convulsions, paralysis, and coma. Death may occur from shock or renal failure. Chronic copper poisoning is typified by hepatic cirrhosis, brain damage and demyelination, kidney defects, and copper deposition in the cornea as exemplified by humans with Wilson s disease. It has also been reported that copper poisoning has led to haemolytic anaemia and accelerates arteriosclerosis.

Chemical properties

orthorhombic; superconductor; 0.2μm powder(s); wet processed from 99.999% nitrates; a hard grayish black sintered material prepared by reacting carbonate and hydroxide free Y2O3 with stoichoimetric amounts of BaCO3 and CuO in air at 950°C for 12h; sensitive to atmospheric CO2 and H2O; a=0.3835nm, b=0.3884nm, c=1.1681nm; transition temp, Tc, is 92K; for YBa2Cu3.5O7.5, Tc is 94 Κ[STR93] [CON87] [CEN92] [ASM93] [ALF93]