THE NOVEL HIGH TEMPERATURE SUPERCONDUCTING Ba–Ca–Cu–O SYSTEM

Organic molecule intercalation sites in Sr2CaCu2Oy superconductor

“…10,11 The elongation of c-parameters are considered to be caused by the intercalation of water molecules into the two SrO layers which are alkaline earth double layers. Similar derivative phase formation was also reported in Ba 2 Ca 2 Cu 3 O y (0 (Ba) 223) [12][13][14][15][16] and in clay minerals including halloysite. After the water (and/or organic molecule) intercalation, both 0 (Sr) 223 and 0 (Ba) 223 exhibited enhancement of irre-Honoring Dr. Mrityunjay Singh versibility field (H irr ) and "peak effect" in critical current density (J c ) properties.…”

Synthesis of CxSr2Ca( n −1)CunOz superconductors using high-pressure-synthesized Sr2Ca( n −1)CunOy precursors (n = 2, 4)

“…The 02(n ¹ 1)n series of the Sr-Ca-Cu-O [3][4][5][6][7][8][9] and the Ba-Ca-Cu-O systems [10][11][12][13][14][15][16][17] have been discovered and investigated by various groups. These 02(n ¹ 1)n phases are known as "zero-charge-reservoir" superconductor because the series do not contain (MO 1«¤ ) m charge reservoir blocks in the unit cell.…”

“…The homologous series were obtained only by means of high-pressure synthesis except for the member with n = 1. The Sr 2 Ca (n¹1) Cu n O 2n+2+¤ [0 (Sr) 2(n ¹ 1)n (n = 3)] 8) phase and the Ba 2 Ca (n¹1) Cu n O 2n+2+¤ [0 (Ba) 2(n ¹ 1)n (n = 2, 3, and 4)] phases [10][11][12][13][14][15][16][17] have unique feature; water or probably also carbon dioxide intrudes between the (AO) 2 double layer when they are exposed to moisture-containing air. This fact suggests that the members of the 02(n ¹ 1)n series are highly unstable phases under ambient atmosphere.…”

Synthesis of CxSr2Ca2Cu3Oz Superconductor from Sr2Ca2Cu3Oy Precursor

“…Among the superconductors, the 02ðn À 1Þn series of the Sr-Ca-Cu-O [3][4][5][6][7][8][9][10] and Ba-Ca-Cu-O systems [11][12][13][14][15][16][17][18] have been discovered and investigated by various groups. The series do not contain (MO 1AE ) m charge reservoir blocks.…”

“…These 02ðn À 1Þn phases are known as the ''zero-charge-reservoir'' superconductor. In the Sr 2 Ca ðnÀ1Þ Cu n O 2nþ2þ [0 ðSrÞ 2ðn À 1Þn (n ¼ 3)] 8) and Ba 2 Ca ðnÀ1Þ Cu n O 2nþ2þ [0 ðBaÞ 2ðn À 1Þn (n ¼ 2; 3; 4)] phases, [11][12][13][14][15][16][17][18] water or carbon dioxide intrudes between the (AO) 2 layers when they are exposed to humid air, which suggests that the 02ðn À 1Þn series members are unstable phases at ambient pressure. It was considered that these series members tend to capture molecules present in the surroundings.…”