Iodometric determination of oxygen contents of the T1 single layer system and their relevance to superconductivity
1991; Elsevier BV; Volume: 182; Issue: 1-3 Linguagem: Inglês
10.1016/0921-4534(91)90461-7
ISSN1873-2143
AutoresSatoru Nakajima, Masae Kikuchi, Yasuhiko Syono, Takeo Oku, K. Nagase, Norio Kobayashi, Daisuke Shindo, K. Hiraga,
Tópico(s)Copper Interconnects and Reliability
ResumoAbstract The oxygen contents of oxygen-annealed T1 single layer systems were determined by iodometric titration. The oxygen contents, w , of T1Ba 2 Ca 1- x Y x Cu 2 O w increased with Y concentration, x , substituted for Ca. Oxygen vacancy, y , was estimated to be about. y =0.3 in oxygen-annealed T1Ba 2 Ca n -1 Cu n O 2 n +3- y ( n =2, 3, 4). The Cu valence of oxygen-annealed T1Ba 2 Ca n -1 Cu n O 2 n +3- y is calculated to be about 2.2+, if the hole is introduced only in the CuO 2 pyramidal sheets. Square planar CuO 2 planes of the T1 single layer system may not be active for superconductivity.
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