TY - JOUR
T1 - The structures of the 126 K Ba2Ca2Cu3(CaxCuy)O 8+δ, the 116 K Ba2Ca3Cu4(CaxCuy)O 10+δ and their transformed products
AU - Xue, Y. Y.
AU - Sun, Y. Y.
AU - Du, Z. L.
AU - Rusakova, I.
AU - Ross, K.
AU - Wu, N. L.
AU - Cao, Y.
AU - Gao, L.
AU - Chu, C. W.
N1 - Funding Information:
·on leave from the National Taiwan Univenity, Taipei. This work is supported in part by NSF DMR 95-00625, EPRI RP-8066-04, TCSUH, T.L. Temple Foundation and the John J. and Rebecca Moores Endowment
PY - 1997/8
Y1 - 1997/8
N2 - Two new superconducting Ba-Ca-Cu oxides were identified as Ba2Ca2Cu3(CaxCuy)O 8+δ and Ba2Ca3Cu4(CaxCuy)O 10+δ with Tc of 126 K and 116 K, respectively. The cations (CaxCuy), 0.4≤x≤0.9 and 0≤v≤0.7, are inserted between two adjacent BaO layers to stabilize the structures and to adjust the Cu-valences. Both compounds show the body-centered symmetry, but with different lattice constants of (a,c) = (3.8, 28.2) and (3.8, 34.8) Å , respectively. These compounds are unstable against the incorporation of CO2 and H2O in open air. The transformed products (Cau/2Cuv/2CxHy)2Ba 2Ca2Cu3O8+δ and (Cau/2Cuv/2CxHy)2Ba 2Ca3Cu4O10+δ have an expanded c of 33.8 and 40.2 Å , and a lower Tc of 90 and 114 K, respectively. The structure models for these decay products are proposed.
AB - Two new superconducting Ba-Ca-Cu oxides were identified as Ba2Ca2Cu3(CaxCuy)O 8+δ and Ba2Ca3Cu4(CaxCuy)O 10+δ with Tc of 126 K and 116 K, respectively. The cations (CaxCuy), 0.4≤x≤0.9 and 0≤v≤0.7, are inserted between two adjacent BaO layers to stabilize the structures and to adjust the Cu-valences. Both compounds show the body-centered symmetry, but with different lattice constants of (a,c) = (3.8, 28.2) and (3.8, 34.8) Å , respectively. These compounds are unstable against the incorporation of CO2 and H2O in open air. The transformed products (Cau/2Cuv/2CxHy)2Ba 2Ca2Cu3O8+δ and (Cau/2Cuv/2CxHy)2Ba 2Ca3Cu4O10+δ have an expanded c of 33.8 and 40.2 Å , and a lower Tc of 90 and 114 K, respectively. The structure models for these decay products are proposed.
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U2 - 10.1016/S0921-4534(97)00534-0
DO - 10.1016/S0921-4534(97)00534-0
M3 - Article
AN - SCOPUS:0031208414
SN - 0921-4534
VL - 282-287
SP - 883
EP - 884
JO - Physica C: Superconductivity and its applications
JF - Physica C: Superconductivity and its applications
IS - PART 2
ER -