Low-temperature synthesis of the (Ba, Sr, Ca)-Cu-O system from hydroxometallate precursors

Ichiro Nagai; Masatsune Kato; Yoji Koike

doi:10.1016/S0921-4534(00)00206-9

Low-temperature synthesis of the (Ba, Sr, Ca)-Cu-O system from hydroxometallate precursors

Ichiro Nagai, Masatsune Kato, Yoji Koike

ENG - Applied Physics

Research output: Contribution to journal › Conference article › peer-review

2 Citations (Scopus)

Abstract

Alkaline-earth cuprates of Sr_1-xCa_xCuO₂ and (Sr_1-xBa_x)₂CuO_3+y have been synthesized at temperatures as low as 400-500°C by thermal decomposition of hydroxometallate precursors of Sr_1-xCa_xCu(OH)₄ · H₂O and (Sr_1-xBa_x)₂Cu(OH)₆ · H₂O, respectively. In the first step of the synthesis, we succeeded in obtaining new hydroxometallate precursors Sr_1-xCa_xCu(OH)₄ · H₂O and (Sr_1-xBa_x)₂Cu(OH)₆ · H₂O through precipitation in a highly concentrated NaOH solution. In the second step, the hydroxometallate precursors were heated at various temperatures. In the case of Sr_1-xCa_xCu(OH)₄ · H₂O, the ambient-pressure phase of SrCuO₂ was obtained at 500°C in flowing N₂ gas. In the case of (Sr_1-xBa_x)₂Cu(OH)₆ · H₂O, three kinds of phases of (Sr_1-xBa_x)₂CuO_3+y with different excess oxygen content y were obtained at 400°C: y approx. 0, approx. 0.1 and approx. 0.3-0.5. It has been found that the excess oxygen content y tends to increase with increasing Ba content x, with increasing oxygen partial pressure during the heat treatment and with decreasing heat-treatment temperature.

Original language	English
Pages (from-to)	84-91
Number of pages	8
Journal	Physica C: Superconductivity and its applications
Volume	338
Issue number	1
DOIs	https://doi.org/10.1016/S0921-4534(00)00206-9
Publication status	Published - 2000 Aug 1
Event	International Discussion Meeting on Chemistry Approaches to High-Tc Superconductive Materials / 5th International Workshop on Chemical Designing and Processing of High-Tc Superconductors (Chem-HTSC-V) - Yokohama, Jpn Duration: 1999 Oct 15 → 1999 Oct 16

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/S0921-4534(00)00206-9

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title = "Low-temperature synthesis of the (Ba, Sr, Ca)-Cu-O system from hydroxometallate precursors",

abstract = "Alkaline-earth cuprates of Sr1-xCaxCuO2 and (Sr1-xBax)2CuO3+y have been synthesized at temperatures as low as 400-500°C by thermal decomposition of hydroxometallate precursors of Sr1-xCaxCu(OH)4 · H2O and (Sr1-xBax)2Cu(OH)6 · H2O, respectively. In the first step of the synthesis, we succeeded in obtaining new hydroxometallate precursors Sr1-xCaxCu(OH)4 · H2O and (Sr1-xBax)2Cu(OH)6 · H2O through precipitation in a highly concentrated NaOH solution. In the second step, the hydroxometallate precursors were heated at various temperatures. In the case of Sr1-xCaxCu(OH)4 · H2O, the ambient-pressure phase of SrCuO2 was obtained at 500°C in flowing N2 gas. In the case of (Sr1-xBax)2Cu(OH)6 · H2O, three kinds of phases of (Sr1-xBax)2CuO3+y with different excess oxygen content y were obtained at 400°C: y approx. 0, approx. 0.1 and approx. 0.3-0.5. It has been found that the excess oxygen content y tends to increase with increasing Ba content x, with increasing oxygen partial pressure during the heat treatment and with decreasing heat-treatment temperature.",

author = "Ichiro Nagai and Masatsune Kato and Yoji Koike",

note = "Funding Information: The authors thank Prof. Y. Syono and Dr. K. Kusaba for their help in the sample preparation by means of high-pressure technique. This work was supported by CREST of Japan Science and Technology, and also by Mitsubishi Foundation.; International Discussion Meeting on Chemistry Approaches to High-Tc Superconductive Materials / 5th International Workshop on Chemical Designing and Processing of High-Tc Superconductors (Chem-HTSC-V) ; Conference date: 15-10-1999 Through 16-10-1999",

year = "2000",

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doi = "10.1016/S0921-4534(00)00206-9",

language = "English",

volume = "338",

pages = "84--91",

journal = "Physica C: Superconductivity and its Applications",

issn = "0921-4534",

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TY - JOUR

T1 - Low-temperature synthesis of the (Ba, Sr, Ca)-Cu-O system from hydroxometallate precursors

AU - Nagai, Ichiro

AU - Kato, Masatsune

AU - Koike, Yoji

N1 - Funding Information: The authors thank Prof. Y. Syono and Dr. K. Kusaba for their help in the sample preparation by means of high-pressure technique. This work was supported by CREST of Japan Science and Technology, and also by Mitsubishi Foundation.

PY - 2000/8/1

Y1 - 2000/8/1

N2 - Alkaline-earth cuprates of Sr1-xCaxCuO2 and (Sr1-xBax)2CuO3+y have been synthesized at temperatures as low as 400-500°C by thermal decomposition of hydroxometallate precursors of Sr1-xCaxCu(OH)4 · H2O and (Sr1-xBax)2Cu(OH)6 · H2O, respectively. In the first step of the synthesis, we succeeded in obtaining new hydroxometallate precursors Sr1-xCaxCu(OH)4 · H2O and (Sr1-xBax)2Cu(OH)6 · H2O through precipitation in a highly concentrated NaOH solution. In the second step, the hydroxometallate precursors were heated at various temperatures. In the case of Sr1-xCaxCu(OH)4 · H2O, the ambient-pressure phase of SrCuO2 was obtained at 500°C in flowing N2 gas. In the case of (Sr1-xBax)2Cu(OH)6 · H2O, three kinds of phases of (Sr1-xBax)2CuO3+y with different excess oxygen content y were obtained at 400°C: y approx. 0, approx. 0.1 and approx. 0.3-0.5. It has been found that the excess oxygen content y tends to increase with increasing Ba content x, with increasing oxygen partial pressure during the heat treatment and with decreasing heat-treatment temperature.

AB - Alkaline-earth cuprates of Sr1-xCaxCuO2 and (Sr1-xBax)2CuO3+y have been synthesized at temperatures as low as 400-500°C by thermal decomposition of hydroxometallate precursors of Sr1-xCaxCu(OH)4 · H2O and (Sr1-xBax)2Cu(OH)6 · H2O, respectively. In the first step of the synthesis, we succeeded in obtaining new hydroxometallate precursors Sr1-xCaxCu(OH)4 · H2O and (Sr1-xBax)2Cu(OH)6 · H2O through precipitation in a highly concentrated NaOH solution. In the second step, the hydroxometallate precursors were heated at various temperatures. In the case of Sr1-xCaxCu(OH)4 · H2O, the ambient-pressure phase of SrCuO2 was obtained at 500°C in flowing N2 gas. In the case of (Sr1-xBax)2Cu(OH)6 · H2O, three kinds of phases of (Sr1-xBax)2CuO3+y with different excess oxygen content y were obtained at 400°C: y approx. 0, approx. 0.1 and approx. 0.3-0.5. It has been found that the excess oxygen content y tends to increase with increasing Ba content x, with increasing oxygen partial pressure during the heat treatment and with decreasing heat-treatment temperature.

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U2 - 10.1016/S0921-4534(00)00206-9

DO - 10.1016/S0921-4534(00)00206-9

M3 - Conference article

AN - SCOPUS:0034249791

SN - 0921-4534

VL - 338

SP - 84

EP - 91

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

IS - 1

T2 - International Discussion Meeting on Chemistry Approaches to High-Tc Superconductive Materials / 5th International Workshop on Chemical Designing and Processing of High-Tc Superconductors (Chem-HTSC-V)

Y2 - 15 October 1999 through 16 October 1999

ER -

Low-temperature synthesis of the (Ba, Sr, Ca)-Cu-O system from hydroxometallate precursors

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