@article{33993, author = {D.M Hwang and T.S Ravi and Ramamoorthy Ramesh and S.-W Chan and C.Y Chen and L Nazar and X.D Wu and A Inam and T Venkatesan}, title = {Application of a near coincidence site lattice theory to the orientations of YBa2Cu3O7-x grains on (001) MgO substrates}, abstract = {Various orientations of YBa2Cu3O7-x grains in polycrystalline films prepared on (001)MgO substrates by in situ laser deposition were determined using electron diffraction. Eight different types of in-plane orientations have been observed. These orientations agree well with the prediction of a simplified theory of near coincidence site lattice between YBa2Cu3O7-x and MgO. The YBa2Cu 3O7-x grains were found to have a high probability of forming low angle or low Σ boundaries among themselves. These grain boundaries are of low energy and should exhibit a high connectivity of Cu-O-Cu chains. Therefore, YBa2Cu3O7-x thin films on MgO can attain a Tc of ∼90 K and a Jc of ∼10 6 A/cm2 at 77 K.}, year = {1990}, journal = {Applied Physics Letters}, volume = {57}, number = {16}, pages = {1690-1692}, issn = {00036951}, doi = {10.1063/1.104138}, note = {cited By 123}, language = {eng}, }