Abstract
Phase equilibria and growth mechanisms of compositions near the Bi2Sr2Ca2Cu3Ox stoichiometry were investigated by high-temperature optical microscopy in air atmosphere and 6.5% O2/93.5% Ar atmosphere. The resulting phases were determined by energy-dispersive X-ray spectroscopy. No primary crystallization phase field of Bi2Sr2Ca2Cu3Ox was found. Bi2Sr2Ca2Cu3Ox crystallizes through a peritectic reaction of Bi-rich melt with (Sr,Ca)14Cu24Ox crystals in air or with (Sr,Ca)CuOx crystals in 6.5% O2/93.5% Ar atmosphere at 870 °C. So Bi2Sr2Ca2Cu3Ox can be grown only for initial compositions within the compatibility tetrahedrons Bi2Sr2Ca1Cu2Ox−Bi11(Sr,Ca)9Cu5Ox−(Sr,Ca)14Cu24Ox−CuO (air atmosphere) or Bi2Sr2Ca1Cu2Ox−Bi11(Sr,Ca)9Cu5Ox−(Sr,Ca)CuOx−CuO (6.5% O2/93.5% Ar atmosphere) even though the Bi2Sr2Ca2Cu3Ox composition does not fall within these compatibility tetrahedra.
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