Compounds and subsolidus phase relations in the CaO - Co3O 4-CuO system

Yuzuru Miyazaki; Xiangyang Huang; Tsuyoshi Kajitani

doi:10.1016/j.jssc.2005.06.042

Compounds and subsolidus phase relations in the CaO - Co₃O ₄-CuO system

Yuzuru Miyazaki, Xiangyang Huang, Tsuyoshi Kajitani

ENG - Applied Physics

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

8 Citations (Scopus)

Abstract

We have investigated the subsolidus phase relations in the system CaO-Co3O4-CuO at 920°C under 1 atm of oxygen by means of powder X-ray diffraction method. Apart from the three known phases of Ca2CuO3, Ca3Co2O6 and (Co1-xCux)3O4 spinel (0≤x≤0.06), two misfit-layered cobaltates have been identified. The first misfit is a solid solution, having a chemical formula [Ca2(Co1-xCux)O3]pCoO2 with 0≤x≤0.12, while the other misfit has a pinpoint composition of [Ca2(Co0.65Cu0.35)2O4]pCoO2. Both the phases have an incommensurate b-axes ratio, p∼0.62, due to the size difference between the two subsystems. Another phase is found in the Cu-rich quasi-one-dimensional composite crystal Cap(Cu1-xCox)O2(p∼0.83,0.08≤x≤0.34), but the terminal compound Ca0.83CuO2 is not synthesized. The octahedral Co site in the Ca3Co2O6 phase can be partially substituted with Cu, up to 6%, to form the Ca3(Co1-xCux)2O6(0≤x≤0.06) solid solution.

Original language	English
Pages (from-to)	2973-2979
Number of pages	7
Journal	Journal of Solid State Chemistry
Volume	178
Issue number	10
DOIs	https://doi.org/10.1016/j.jssc.2005.06.042
Publication status	Published - 2005 Oct

Keywords

Ca-Co-Cu-O system
Composite crystal
Crystal structure
Phase relations
Rietveld analysis
Solid solution
Thermoelectric compounds

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Physical and Theoretical Chemistry
Inorganic Chemistry
Materials Chemistry

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10.1016/j.jssc.2005.06.042

Cite this

@article{dcf4e7f52af940df938d0e3b72ce4552,

title = "Compounds and subsolidus phase relations in the CaO - Co3O 4-CuO system",

abstract = "We have investigated the subsolidus phase relations in the system CaO-Co3O4-CuO at 920°C under 1 atm of oxygen by means of powder X-ray diffraction method. Apart from the three known phases of Ca2CuO3, Ca3Co2O6 and (Co1-xCux)3O4 spinel (0≤x≤0.06), two misfit-layered cobaltates have been identified. The first misfit is a solid solution, having a chemical formula [Ca2(Co1-xCux)O3]pCoO2 with 0≤x≤0.12, while the other misfit has a pinpoint composition of [Ca2(Co0.65Cu0.35)2O4]pCoO2. Both the phases have an incommensurate b-axes ratio, p∼0.62, due to the size difference between the two subsystems. Another phase is found in the Cu-rich quasi-one-dimensional composite crystal Cap(Cu1-xCox)O2(p∼0.83,0.08≤x≤0.34), but the terminal compound Ca0.83CuO2 is not synthesized. The octahedral Co site in the Ca3Co2O6 phase can be partially substituted with Cu, up to 6%, to form the Ca3(Co1-xCux)2O6(0≤x≤0.06) solid solution.",

keywords = "Ca-Co-Cu-O system, Composite crystal, Crystal structure, Phase relations, Rietveld analysis, Solid solution, Thermoelectric compounds",

author = "Yuzuru Miyazaki and Xiangyang Huang and Tsuyoshi Kajitani",

note = "Funding Information: This study was partly supported by the Core Research for Evolution Science and Technology (CREST) Project of Japan Science and Technology Agency (JST), and also by a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology, Japan.",

year = "2005",

month = oct,

doi = "10.1016/j.jssc.2005.06.042",

language = "English",

volume = "178",

pages = "2973--2979",

journal = "Journal of Solid State Chemistry",

issn = "0022-4596",

publisher = "Academic Press Inc.",

number = "10",

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TY - JOUR

T1 - Compounds and subsolidus phase relations in the CaO - Co3O 4-CuO system

AU - Miyazaki, Yuzuru

AU - Huang, Xiangyang

AU - Kajitani, Tsuyoshi

N1 - Funding Information: This study was partly supported by the Core Research for Evolution Science and Technology (CREST) Project of Japan Science and Technology Agency (JST), and also by a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology, Japan.

PY - 2005/10

Y1 - 2005/10

N2 - We have investigated the subsolidus phase relations in the system CaO-Co3O4-CuO at 920°C under 1 atm of oxygen by means of powder X-ray diffraction method. Apart from the three known phases of Ca2CuO3, Ca3Co2O6 and (Co1-xCux)3O4 spinel (0≤x≤0.06), two misfit-layered cobaltates have been identified. The first misfit is a solid solution, having a chemical formula [Ca2(Co1-xCux)O3]pCoO2 with 0≤x≤0.12, while the other misfit has a pinpoint composition of [Ca2(Co0.65Cu0.35)2O4]pCoO2. Both the phases have an incommensurate b-axes ratio, p∼0.62, due to the size difference between the two subsystems. Another phase is found in the Cu-rich quasi-one-dimensional composite crystal Cap(Cu1-xCox)O2(p∼0.83,0.08≤x≤0.34), but the terminal compound Ca0.83CuO2 is not synthesized. The octahedral Co site in the Ca3Co2O6 phase can be partially substituted with Cu, up to 6%, to form the Ca3(Co1-xCux)2O6(0≤x≤0.06) solid solution.

AB - We have investigated the subsolidus phase relations in the system CaO-Co3O4-CuO at 920°C under 1 atm of oxygen by means of powder X-ray diffraction method. Apart from the three known phases of Ca2CuO3, Ca3Co2O6 and (Co1-xCux)3O4 spinel (0≤x≤0.06), two misfit-layered cobaltates have been identified. The first misfit is a solid solution, having a chemical formula [Ca2(Co1-xCux)O3]pCoO2 with 0≤x≤0.12, while the other misfit has a pinpoint composition of [Ca2(Co0.65Cu0.35)2O4]pCoO2. Both the phases have an incommensurate b-axes ratio, p∼0.62, due to the size difference between the two subsystems. Another phase is found in the Cu-rich quasi-one-dimensional composite crystal Cap(Cu1-xCox)O2(p∼0.83,0.08≤x≤0.34), but the terminal compound Ca0.83CuO2 is not synthesized. The octahedral Co site in the Ca3Co2O6 phase can be partially substituted with Cu, up to 6%, to form the Ca3(Co1-xCux)2O6(0≤x≤0.06) solid solution.

KW - Ca-Co-Cu-O system

KW - Composite crystal

KW - Crystal structure

KW - Phase relations

KW - Rietveld analysis

KW - Solid solution

KW - Thermoelectric compounds

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U2 - 10.1016/j.jssc.2005.06.042

DO - 10.1016/j.jssc.2005.06.042

M3 - Article

AN - SCOPUS:25644439925

VL - 178

SP - 2973

EP - 2979

JO - Journal of Solid State Chemistry

JF - Journal of Solid State Chemistry

SN - 0022-4596

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