High-pressure synthesis, crystal structure, and magnetic properties of Mn1-xTxGe4 (T: Co, Fe)

H. Takizawa; K. Yamazaki; T. Endo; M. Shimada

doi:10.1006/jssc.1993.1235

High-pressure synthesis, crystal structure, and magnetic properties of Mn_1-xT_xGe₄ (T: Co, Fe)

H. Takizawa, K. Yamazaki, T. Endo, M. Shimada

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

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Abstract

Mn_1-xT_xGe₄ (T: Co, Fe) solid solution was synthesized at 6 GPa and 650-750°C using a belt-type high-pressure apparatus. The crystal structure of the Mn_1-xT_xGe₄ solid solution is related to the β-NiHg₄ type. The following structural changes were observed in the Mn_1-xCo_xGe₄ system: tetragonal (x = 0) to orthorhombic (0 < x < 0.2) and orthorhombic to pseudotetragonal (0.2 ≦ x ≦ 0.4). Similar structural changes were also observed at 0 < x < 0.4 (tetra. → ortho.) and x = 0.4 (ortho. → pseudotetra.) in the Mn_1-xFe_xGe₄ system. These results indicate that the structural changes in Mn_1-xT_xGe₄ strongly depend on the average valence electron number of the transition metal atoms. Mn_1-xT_xGe₄ solid solutions are itinerant electron ferromagnets and the Curie temperature decreases linearly with decreasing unit-cell volume.

Original language	English
Pages (from-to)	428-433
Number of pages	6
Journal	Journal of Solid State Chemistry
Volume	105
Issue number	2
DOIs	https://doi.org/10.1006/jssc.1993.1235
Publication status	Published - 1993 Aug

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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title = "High-pressure synthesis, crystal structure, and magnetic properties of Mn1-xTxGe4 (T: Co, Fe)",

abstract = "Mn1-xTxGe4 (T: Co, Fe) solid solution was synthesized at 6 GPa and 650-750°C using a belt-type high-pressure apparatus. The crystal structure of the Mn1-xTxGe4 solid solution is related to the β-NiHg4 type. The following structural changes were observed in the Mn1-xCoxGe4 system: tetragonal (x = 0) to orthorhombic (0 < x < 0.2) and orthorhombic to pseudotetragonal (0.2 ≦ x ≦ 0.4). Similar structural changes were also observed at 0 < x < 0.4 (tetra. → ortho.) and x = 0.4 (ortho. → pseudotetra.) in the Mn1-xFexGe4 system. These results indicate that the structural changes in Mn1-xTxGe4 strongly depend on the average valence electron number of the transition metal atoms. Mn1-xTxGe4 solid solutions are itinerant electron ferromagnets and the Curie temperature decreases linearly with decreasing unit-cell volume.",

author = "H. Takizawa and K. Yamazaki and T. Endo and M. Shimada",

year = "1993",

month = aug,

doi = "10.1006/jssc.1993.1235",

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T2 - Co, Fe)

AU - Takizawa, H.

AU - Yamazaki, K.

AU - Endo, T.

AU - Shimada, M.

PY - 1993/8

Y1 - 1993/8

N2 - Mn1-xTxGe4 (T: Co, Fe) solid solution was synthesized at 6 GPa and 650-750°C using a belt-type high-pressure apparatus. The crystal structure of the Mn1-xTxGe4 solid solution is related to the β-NiHg4 type. The following structural changes were observed in the Mn1-xCoxGe4 system: tetragonal (x = 0) to orthorhombic (0 < x < 0.2) and orthorhombic to pseudotetragonal (0.2 ≦ x ≦ 0.4). Similar structural changes were also observed at 0 < x < 0.4 (tetra. → ortho.) and x = 0.4 (ortho. → pseudotetra.) in the Mn1-xFexGe4 system. These results indicate that the structural changes in Mn1-xTxGe4 strongly depend on the average valence electron number of the transition metal atoms. Mn1-xTxGe4 solid solutions are itinerant electron ferromagnets and the Curie temperature decreases linearly with decreasing unit-cell volume.

AB - Mn1-xTxGe4 (T: Co, Fe) solid solution was synthesized at 6 GPa and 650-750°C using a belt-type high-pressure apparatus. The crystal structure of the Mn1-xTxGe4 solid solution is related to the β-NiHg4 type. The following structural changes were observed in the Mn1-xCoxGe4 system: tetragonal (x = 0) to orthorhombic (0 < x < 0.2) and orthorhombic to pseudotetragonal (0.2 ≦ x ≦ 0.4). Similar structural changes were also observed at 0 < x < 0.4 (tetra. → ortho.) and x = 0.4 (ortho. → pseudotetra.) in the Mn1-xFexGe4 system. These results indicate that the structural changes in Mn1-xTxGe4 strongly depend on the average valence electron number of the transition metal atoms. Mn1-xTxGe4 solid solutions are itinerant electron ferromagnets and the Curie temperature decreases linearly with decreasing unit-cell volume.

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SN - 0022-4596

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High-pressure synthesis, crystal structure, and magnetic properties of Mn_1-xT_xGe₄ (T: Co, Fe)

Abstract

ASJC Scopus subject areas

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