| abstract |
B, c and d < 1, a + b < / RTI > of the formula: Pb a -Bi b -Te c -M d -O e , b is about 5:95 and about 95: 5, a: c is about 10:90 and about 90:10, b: c is about 5: 95 and about 95: 5, (a + b): c is between about 10:90 and about 90:10, e is a number sufficient to balance the Pb, Bi, Te, and M components, and M is one Or more. |