TY - JOUR
KW - High temperature superconductors
KW - Superconducting materials
KW - Yttrium barium copper oxides
KW - Oxide superconductors
KW - Microscopic Examination - Transmission Electron Microscopy
KW - Crystals - Structure
KW - Oxides - Electric Conductivity
KW - Bismuth Cuprates
KW - Polytypoidic Stacking Units
KW - Polytypoidism
AU - Ramamoorthy Ramesh
AU - D.M Hwang
AU - T.S Ravi
AU - C.C Chang
AU - A Inam
AU - X.D Wu
AU - T Venkatesan
AU - J.M Tarascon
AU - S.M Green
AB - High resolution transmission electron microscopy has been used to reveal the cationic structure of the high temperature oxide superconductors. Of the many new systems discovered recently, the BiSrCaCuO, TlBaCaCuO have been extensively studied. Compositional variations are accommodated by the formation of polytypoidic stacking units whose cationic stoichiometries are in specific fixed ratios. Examples from the Bi cuprate bulk superconductors and Y-Ba-Cu-O thin films are presented. Identification of the different polytypoids, each of which has a specific transition temperature, Tc, can shed light on the electrical properties of the mixed bulk or thin films. Polytypism and polytypoidism also provide a unified approach to the structural and chemical analysis of these oxide superconductors. © 1990.
BT - Materials Letters
DO - 10.1016/0167-577X(90)90066-U
LA - eng
M1 - 10
N1 - cited By 12
N2 - High resolution transmission electron microscopy has been used to reveal the cationic structure of the high temperature oxide superconductors. Of the many new systems discovered recently, the BiSrCaCuO, TlBaCaCuO have been extensively studied. Compositional variations are accommodated by the formation of polytypoidic stacking units whose cationic stoichiometries are in specific fixed ratios. Examples from the Bi cuprate bulk superconductors and Y-Ba-Cu-O thin films are presented. Identification of the different polytypoids, each of which has a specific transition temperature, Tc, can shed light on the electrical properties of the mixed bulk or thin films. Polytypism and polytypoidism also provide a unified approach to the structural and chemical analysis of these oxide superconductors. © 1990.
PY - 1990
SP - 357
EP - 364
T2 - Materials Letters
TI - Polytypoidic structures in high temperature oxide superconductors
VL - 9
SN - 0167577X
ER -