Preparation and structural characterization of perovskite-type LaxLn″1-xCoO3 by the thermal decomposition of heteronuclear complexes, LaxLn″1-x[Co(CN)6] · nH2O (Ln″ = Sm and Ho)

Yoshihiko Sadaoka; Enrico Traversa; Masatomi Sakamoto

doi:10.1016/0925-8388(96)02300-6

Preparation and structural characterization of perovskite-type La_xLn″_1-xCoO₃ by the thermal decomposition of heteronuclear complexes, La_xLn″_1-x[Co(CN)₆] · nH₂O (Ln″ = Sm and Ho)

Yoshihiko Sadaoka^*, Enrico Traversa, Masatomi Sakamoto

^*Corresponding author for this work

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

43 Scopus citations

Abstract

Perovskite-type La_xLn″_1-xCoO₃ oxides are prepared by the thermal decomposition of La_xLn″_1-x [Co(CN)₆] · nH₂O heteronuclear complexes. Except for LaCoO₃ (hexagonal), the structures observed for La_xSm_1-xCoO₃ are orthorhombic. While the perovskite-type oxide HoCoO₃ is not formed by decomposition at 1000°C of the corresponding hexacyano complex, the partial replacing of Ho with La is effective in forming the perovskite-type oxide having an orthorhombic structure containing Ho even at 800°C. A monotonous correlation (quasi-linear relationship) was found between the b- and c-lattice constants of the orthorhombic structures of the perovskite-type oxides and the effective radii of Ln ions, defined as r_eff = xr_La +(1 - x)r_Ln″. The distortion parameter for the orthorhombic cell (3^0.5a/b -1) increases with decrease in r_eff and is expected to be 0.270 for perovskite-type HoCoO₃. The crystal structure of the La_xLn″_1-xCoO₃ oxides is mainly controlled by the effective radii of Ln ions.

Original language	English (US)
Pages (from-to)	51-59
Number of pages	9
Journal	Journal of Alloys and Compounds
Volume	240
Issue number	1-2
DOIs	https://doi.org/10.1016/0925-8388(96)02300-6
State	Published - Jul 1 1996
Externally published	Yes

Keywords

Heteronuclear complexes
Hexacyano complexes
Lanthanum cobalt oxides
Perovskite-type oxides

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

Access to Document

10.1016/0925-8388(96)02300-6

Cite this

@article{1a43c773a5d74c86b71006b8c80452c9,

title = "Preparation and structural characterization of perovskite-type LaxLn″1-xCoO3 by the thermal decomposition of heteronuclear complexes, LaxLn″1-x[Co(CN)6] · nH2O (Ln″ = Sm and Ho)",

abstract = "Perovskite-type LaxLn″1-xCoO3 oxides are prepared by the thermal decomposition of LaxLn″1-x [Co(CN)6] · nH2O heteronuclear complexes. Except for LaCoO3 (hexagonal), the structures observed for LaxSm1-xCoO3 are orthorhombic. While the perovskite-type oxide HoCoO3 is not formed by decomposition at 1000°C of the corresponding hexacyano complex, the partial replacing of Ho with La is effective in forming the perovskite-type oxide having an orthorhombic structure containing Ho even at 800°C. A monotonous correlation (quasi-linear relationship) was found between the b- and c-lattice constants of the orthorhombic structures of the perovskite-type oxides and the effective radii of Ln ions, defined as reff = xrLa +(1 - x)rLn″. The distortion parameter for the orthorhombic cell (30.5a/b -1) increases with decrease in reff and is expected to be 0.270 for perovskite-type HoCoO3. The crystal structure of the LaxLn″1-xCoO3 oxides is mainly controlled by the effective radii of Ln ions.",

keywords = "Heteronuclear complexes, Hexacyano complexes, Lanthanum cobalt oxides, Perovskite-type oxides",

author = "Yoshihiko Sadaoka and Enrico Traversa and Masatomi Sakamoto",

year = "1996",

month = jul,

day = "1",

doi = "10.1016/0925-8388(96)02300-6",

language = "English (US)",

volume = "240",

pages = "51--59",

journal = "Journal of Alloys and Compounds",

issn = "0925-8388",

publisher = "Elsevier B.V.",

number = "1-2",

}

Preparation and structural characterization of perovskite-type La_xLn″_1-xCoO₃ by the thermal decomposition of heteronuclear complexes, La_xLn″_1-x[Co(CN)₆] · nH₂O (Ln″ = Sm and Ho). / Sadaoka, Yoshihiko; Traversa, Enrico; Sakamoto, Masatomi.
In: Journal of Alloys and Compounds, Vol. 240, No. 1-2, 01.07.1996, p. 51-59.

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

TY - JOUR

T1 - Preparation and structural characterization of perovskite-type LaxLn″1-xCoO3 by the thermal decomposition of heteronuclear complexes, LaxLn″1-x[Co(CN)6] · nH2O (Ln″ = Sm and Ho)

AU - Sadaoka, Yoshihiko

AU - Traversa, Enrico

AU - Sakamoto, Masatomi

PY - 1996/7/1

Y1 - 1996/7/1

N2 - Perovskite-type LaxLn″1-xCoO3 oxides are prepared by the thermal decomposition of LaxLn″1-x [Co(CN)6] · nH2O heteronuclear complexes. Except for LaCoO3 (hexagonal), the structures observed for LaxSm1-xCoO3 are orthorhombic. While the perovskite-type oxide HoCoO3 is not formed by decomposition at 1000°C of the corresponding hexacyano complex, the partial replacing of Ho with La is effective in forming the perovskite-type oxide having an orthorhombic structure containing Ho even at 800°C. A monotonous correlation (quasi-linear relationship) was found between the b- and c-lattice constants of the orthorhombic structures of the perovskite-type oxides and the effective radii of Ln ions, defined as reff = xrLa +(1 - x)rLn″. The distortion parameter for the orthorhombic cell (30.5a/b -1) increases with decrease in reff and is expected to be 0.270 for perovskite-type HoCoO3. The crystal structure of the LaxLn″1-xCoO3 oxides is mainly controlled by the effective radii of Ln ions.

AB - Perovskite-type LaxLn″1-xCoO3 oxides are prepared by the thermal decomposition of LaxLn″1-x [Co(CN)6] · nH2O heteronuclear complexes. Except for LaCoO3 (hexagonal), the structures observed for LaxSm1-xCoO3 are orthorhombic. While the perovskite-type oxide HoCoO3 is not formed by decomposition at 1000°C of the corresponding hexacyano complex, the partial replacing of Ho with La is effective in forming the perovskite-type oxide having an orthorhombic structure containing Ho even at 800°C. A monotonous correlation (quasi-linear relationship) was found between the b- and c-lattice constants of the orthorhombic structures of the perovskite-type oxides and the effective radii of Ln ions, defined as reff = xrLa +(1 - x)rLn″. The distortion parameter for the orthorhombic cell (30.5a/b -1) increases with decrease in reff and is expected to be 0.270 for perovskite-type HoCoO3. The crystal structure of the LaxLn″1-xCoO3 oxides is mainly controlled by the effective radii of Ln ions.

KW - Heteronuclear complexes

KW - Hexacyano complexes

KW - Lanthanum cobalt oxides

KW - Perovskite-type oxides

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U2 - 10.1016/0925-8388(96)02300-6

DO - 10.1016/0925-8388(96)02300-6

M3 - Article

AN - SCOPUS:0030191968

SN - 0925-8388

VL - 240

SP - 51

EP - 59

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

IS - 1-2

ER -