Pengaruh Perlakuan Panas terhadap Karakteristik BaPb1-xBixO3 (x = 0; 0,05; 0,25), serta Implementasinya sebagai Kawat Superkonduktor = The Effect of Heat Treatment on the Characteristics of BaPb1-xBixO3 (x = 0; 0,05; 0,25), and Its Implementation as a Superconducting Wire