Low-temperature structural phase transitions in rare earths substituted calcium manganese oxides [Ca2-xLnxMnO4, where Ln=Nd, Sm-Lu and Y]

Junichi Takahashi; Naoki Kamegashira

doi:10.1016/0025-5408(93)90127-Y

Low-temperature structural phase transitions in rare earths substituted calcium manganese oxides [Ca_2-xLn_xMnO₄, where Ln=Nd, Sm-Lu and Y]

Junichi Takahashi, Naoki Kamegashira

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

6 Citations (Scopus)

Abstract

The structural phase transitions of Ca_2-xLn_xMnO₄ (Ln=Nd, Sm-Lu and Y) were investigated by powder X-ray diffraction in the temperature range 10-1000 K. The maximum amount of the substitution, x, for the formation of the single phase had a tendency to decrease with decreasing ionic radii of rare earths. The new type of orthorhombic phase with a distortion along [100] direction of the undistorted tetragonal phase was found for Ln=Nd, Sm, Lu and Y with x=0.2. The low temperature tetragonal phase was observed in the case of Ln=Sm with x=0.3.

Original language	English
Pages (from-to)	451-460
Number of pages	10
Journal	Materials Research Bulletin
Volume	28
Issue number	5
DOIs	https://doi.org/10.1016/0025-5408(93)90127-Y
Publication status	Published - 1993 May
Externally published	Yes

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1016/0025-5408(93)90127-Y

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title = "Low-temperature structural phase transitions in rare earths substituted calcium manganese oxides [Ca2-xLnxMnO4, where Ln=Nd, Sm-Lu and Y]",

abstract = "The structural phase transitions of Ca2-xLnxMnO4 (Ln=Nd, Sm-Lu and Y) were investigated by powder X-ray diffraction in the temperature range 10-1000 K. The maximum amount of the substitution, x, for the formation of the single phase had a tendency to decrease with decreasing ionic radii of rare earths. The new type of orthorhombic phase with a distortion along [100] direction of the undistorted tetragonal phase was found for Ln=Nd, Sm, Lu and Y with x=0.2. The low temperature tetragonal phase was observed in the case of Ln=Sm with x=0.3.",

author = "Junichi Takahashi and Naoki Kamegashira",

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T1 - Low-temperature structural phase transitions in rare earths substituted calcium manganese oxides [Ca2-xLnxMnO4, where Ln=Nd, Sm-Lu and Y]

AU - Takahashi, Junichi

AU - Kamegashira, Naoki

PY - 1993/5

Y1 - 1993/5

N2 - The structural phase transitions of Ca2-xLnxMnO4 (Ln=Nd, Sm-Lu and Y) were investigated by powder X-ray diffraction in the temperature range 10-1000 K. The maximum amount of the substitution, x, for the formation of the single phase had a tendency to decrease with decreasing ionic radii of rare earths. The new type of orthorhombic phase with a distortion along [100] direction of the undistorted tetragonal phase was found for Ln=Nd, Sm, Lu and Y with x=0.2. The low temperature tetragonal phase was observed in the case of Ln=Sm with x=0.3.

AB - The structural phase transitions of Ca2-xLnxMnO4 (Ln=Nd, Sm-Lu and Y) were investigated by powder X-ray diffraction in the temperature range 10-1000 K. The maximum amount of the substitution, x, for the formation of the single phase had a tendency to decrease with decreasing ionic radii of rare earths. The new type of orthorhombic phase with a distortion along [100] direction of the undistorted tetragonal phase was found for Ln=Nd, Sm, Lu and Y with x=0.2. The low temperature tetragonal phase was observed in the case of Ln=Sm with x=0.3.

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JF - Materials Research Bulletin

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Low-temperature structural phase transitions in rare earths substituted calcium manganese oxides [Ca_2-xLn_xMnO₄, where Ln=Nd, Sm-Lu and Y]

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