Changes in modulation period of Bi2Sr2 (Ca1-xNdx) Cu2Oa + δ and their relations to oxygen content

Takashi Onozuka; Ayako Tokiwa; Yasuhiko Syono; Yoji Koike; Yoshitami Saito

doi:10.1016/0921-4534(91)91666-R

Changes in modulation period of Bi₂Sr₂ (Ca_1-xNd_x) Cu₂O_{a + δ} and their relations to oxygen content

Takashi Onozuka, Ayako Tokiwa, Yasuhiko Syono, Yoji Koike, Yoshitami Saito

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

Structural changes of long-period modulated structure (LPMS) of the Bi₂Sr₂(Ca_1-xNd_x) Cu₂O_{a + δ} ceramics with x are investigated by means of electron diffraction. Increasing x, the modulation mode of the mixing of domains of two modulation periods with b=4.5b_o and b=5b_o changes to that with b=4.5b_o and b=4b_o through the modulation mode with only b=4.5b_o at x=0.4-0.5. The wavenumber of the superlattice reflection shows a stepwise increase rather than a linear increase with x. Excess oxygen in a LPMS model with the site of excess oxygen is shown to be consistent with excess oxygen analyzed chemically by iodometry and its change with x.

Original language	English
Pages (from-to)	885-886
Number of pages	2
Journal	Physica C: Superconductivity and its applications
Volume	185-189
Issue number	PART 2
DOIs	https://doi.org/10.1016/0921-4534(91)91666-R
Publication status	Published - 1991 Dec 1
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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10.1016/0921-4534(91)91666-R

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abstract = "Structural changes of long-period modulated structure (LPMS) of the Bi2Sr2(Ca1-xNdx) Cu2Oa + δ ceramics with x are investigated by means of electron diffraction. Increasing x, the modulation mode of the mixing of domains of two modulation periods with b=4.5bo and b=5bo changes to that with b=4.5bo and b=4bo through the modulation mode with only b=4.5bo at x=0.4-0.5. The wavenumber of the superlattice reflection shows a stepwise increase rather than a linear increase with x. Excess oxygen in a LPMS model with the site of excess oxygen is shown to be consistent with excess oxygen analyzed chemically by iodometry and its change with x.",

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T1 - Changes in modulation period of Bi2Sr2 (Ca1-xNdx) Cu2Oa + δ and their relations to oxygen content

AU - Onozuka, Takashi

AU - Tokiwa, Ayako

AU - Syono, Yasuhiko

AU - Koike, Yoji

AU - Saito, Yoshitami

PY - 1991/12/1

Y1 - 1991/12/1

N2 - Structural changes of long-period modulated structure (LPMS) of the Bi2Sr2(Ca1-xNdx) Cu2Oa + δ ceramics with x are investigated by means of electron diffraction. Increasing x, the modulation mode of the mixing of domains of two modulation periods with b=4.5bo and b=5bo changes to that with b=4.5bo and b=4bo through the modulation mode with only b=4.5bo at x=0.4-0.5. The wavenumber of the superlattice reflection shows a stepwise increase rather than a linear increase with x. Excess oxygen in a LPMS model with the site of excess oxygen is shown to be consistent with excess oxygen analyzed chemically by iodometry and its change with x.

AB - Structural changes of long-period modulated structure (LPMS) of the Bi2Sr2(Ca1-xNdx) Cu2Oa + δ ceramics with x are investigated by means of electron diffraction. Increasing x, the modulation mode of the mixing of domains of two modulation periods with b=4.5bo and b=5bo changes to that with b=4.5bo and b=4bo through the modulation mode with only b=4.5bo at x=0.4-0.5. The wavenumber of the superlattice reflection shows a stepwise increase rather than a linear increase with x. Excess oxygen in a LPMS model with the site of excess oxygen is shown to be consistent with excess oxygen analyzed chemically by iodometry and its change with x.

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Changes in modulation period of Bi₂Sr₂ (Ca_1-xNd_x) Cu₂O_{a + δ} and their relations to oxygen content

Abstract

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