Phase diagram of the BaO(BaCO3)-CaO-CuO system

Yoshihiro Kusano; Takeyuki Kikuchi; Jun Takada; Minoru Fukuhara; Yasunori Ikeda; Zenji Hiroi

doi:10.1111/j.1151-2916.1999.tb01916.x

Phase diagram of the BaO(BaCO₃)-CaO-CuO system

Yoshihiro Kusano, Takeyuki Kikuchi, Jun Takada, Minoru Fukuhara, Yasunori Ikeda, Zenji Hiroi

Faculty of Engineering

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

Abstract

The phase diagram of the BaO(BaCO₃)-CaO-CuO system, especially in the barium-rich region at 900°C in air, was studied. Two new different oxycarbonates were observed: Ba₈Ca_16/15Cu_64/15O_11.20(CO ₃)_2.66 and a solid-solution series with a chemical composition of Ba₂Ca_x+yCu_1+(x/2)-yO_2+δCO ₃)_1-z (where 0 ≤ x ≤ 2/39 and 0 ≤ y ≤ 16x/5). The oxycarbonate solid solution was formed in a region of the compositional triangle Ba:Ca:Cu (in moles) = (2:0:1)-(39:l:20)-(65:7:28). The solid-solution structure had P4/mmm symmetry, with lattice parameters a ≈ a_p and c ≈ 2a_p, where a_p represents the perovskite cell. The Ba₈Ca_16/15Cu_64/15O_11.20(CO ₃)_2.66 compound, which had Pm3m symmetry with a lattice parameter a = 0.8116(2) nm, had no chemical-solubility range.

Original language	English
Pages (from-to)	1329-1332
Number of pages	4
Journal	Journal of the American Ceramic Society
Volume	82
Issue number	5
DOIs	https://doi.org/10.1111/j.1151-2916.1999.tb01916.x
Publication status	Published - 1999

ASJC Scopus subject areas

Ceramics and Composites
Materials Chemistry

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title = "Phase diagram of the BaO(BaCO3)-CaO-CuO system",

abstract = "The phase diagram of the BaO(BaCO3)-CaO-CuO system, especially in the barium-rich region at 900°C in air, was studied. Two new different oxycarbonates were observed: Ba8Ca16/15Cu64/15O11.20(CO 3)2.66 and a solid-solution series with a chemical composition of Ba2Cax+yCu1+(x/2)-yO2+δCO 3)1-z (where 0 ≤ x ≤ 2/39 and 0 ≤ y ≤ 16x/5). The oxycarbonate solid solution was formed in a region of the compositional triangle Ba:Ca:Cu (in moles) = (2:0:1)-(39:l:20)-(65:7:28). The solid-solution structure had P4/mmm symmetry, with lattice parameters a ≈ ap and c ≈ 2ap, where ap represents the perovskite cell. The Ba8Ca16/15Cu64/15O11.20(CO 3)2.66 compound, which had Pm3m symmetry with a lattice parameter a = 0.8116(2) nm, had no chemical-solubility range.",

author = "Yoshihiro Kusano and Takeyuki Kikuchi and Jun Takada and Minoru Fukuhara and Yasunori Ikeda and Zenji Hiroi",

year = "1999",

doi = "10.1111/j.1151-2916.1999.tb01916.x",

language = "English",

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AU - Kusano, Yoshihiro

AU - Kikuchi, Takeyuki

AU - Takada, Jun

AU - Fukuhara, Minoru

AU - Ikeda, Yasunori

AU - Hiroi, Zenji

PY - 1999

Y1 - 1999

N2 - The phase diagram of the BaO(BaCO3)-CaO-CuO system, especially in the barium-rich region at 900°C in air, was studied. Two new different oxycarbonates were observed: Ba8Ca16/15Cu64/15O11.20(CO 3)2.66 and a solid-solution series with a chemical composition of Ba2Cax+yCu1+(x/2)-yO2+δCO 3)1-z (where 0 ≤ x ≤ 2/39 and 0 ≤ y ≤ 16x/5). The oxycarbonate solid solution was formed in a region of the compositional triangle Ba:Ca:Cu (in moles) = (2:0:1)-(39:l:20)-(65:7:28). The solid-solution structure had P4/mmm symmetry, with lattice parameters a ≈ ap and c ≈ 2ap, where ap represents the perovskite cell. The Ba8Ca16/15Cu64/15O11.20(CO 3)2.66 compound, which had Pm3m symmetry with a lattice parameter a = 0.8116(2) nm, had no chemical-solubility range.

AB - The phase diagram of the BaO(BaCO3)-CaO-CuO system, especially in the barium-rich region at 900°C in air, was studied. Two new different oxycarbonates were observed: Ba8Ca16/15Cu64/15O11.20(CO 3)2.66 and a solid-solution series with a chemical composition of Ba2Cax+yCu1+(x/2)-yO2+δCO 3)1-z (where 0 ≤ x ≤ 2/39 and 0 ≤ y ≤ 16x/5). The oxycarbonate solid solution was formed in a region of the compositional triangle Ba:Ca:Cu (in moles) = (2:0:1)-(39:l:20)-(65:7:28). The solid-solution structure had P4/mmm symmetry, with lattice parameters a ≈ ap and c ≈ 2ap, where ap represents the perovskite cell. The Ba8Ca16/15Cu64/15O11.20(CO 3)2.66 compound, which had Pm3m symmetry with a lattice parameter a = 0.8116(2) nm, had no chemical-solubility range.

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Phase diagram of the BaO(BaCO₃)-CaO-CuO system

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