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The combined effects of dilatation stresses, stoichiometric and
electric-charge inhomogeneities, dx2-y2 symmetry of the superconducting order
parameter and the faceted microstructure of grain boundaries are theoretically
examined here as those causing the experimentally observed (see, e.g., Dimos et
al, Phys.Rev. B 41 (1990) 4038) reduction of the critical current density Jc
across grain boundaries in high-Tc cuprates. The enhancement of Jc across
high-quality twist and doped grain boundaries in high-Tc cuprates is briefly
discussed.
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