A model for the texture development of high-T-c superconductors under an elevated magnetic field

A theoretical model is proposed to explain the degree of texture achieved i n high-ir, superconductors during melt-processing under an elevated magneti c field. The degree of grain alignment is quantified through a factor F whi ch is defined as ranging from 0 (random alignment) to 1 (completely oriente d). Intermediate values of F dearly characterize intermediate states of ali gnment in which there is still some tendency for the grains to align their c axes with the magnetic field. The model suggests that the enhancement in texture is primarily obtained through grain rotation during the early stage s of grain growth from the liquid. At the later stages of growth, grains in teract with each other, which hinders the phenomena of magnetic-field-induc ed grain alignment.