Crystal structure of rare-earth silicon-oxynitride J-phases, Ln4Si2O7N2

Junichi Takahashi; Hisanori Yamane; Naoto Hirosaki; Yoshinobu Yamamoto; Mamoru Mitomo; Masahiko Shimada

doi:10.1016/j.jeurceramsoc.2004.02.008

Crystal structure of rare-earth silicon-oxynitride J-phases, Ln₄Si₂O₇N₂

Junichi Takahashi, Hisanori Yamane, Naoto Hirosaki, Yoshinobu Yamamoto, Mamoru Mitomo, Masahiko Shimada

IMRAM - Division of Inorganic Material Research

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

15 Citations (Scopus)

Abstract

Rare-earth silicon-oxynitride J-phases, Ln₄Si₂ O₇N₂ (Ln=Y, La, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu), were prepared by the N₂ gas-pressured sintering method at 1 MPa of N₂ and 1500-1700 °C. The Rietveld analysis was carried out for X-ray powder diffraction data measured at room temperature. The crystal structures of Ln₄ Si₂O₇N₂ were refined with the structure model of La₄Si₂O₇N₂ for Ln=La, Pr, Nd, and Sm, and with that of Lu₄Si₂ O₇N₂ for Ln=Y, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu. The refined monoclinic unit-cell parameters (lengths a, b, c, angles β, and volume V) increased linearly in their two series of Ln with increasing ionic radii of rare-earth atoms. Discontinuities of the unit-cell parameters were found between the two Ln series.

Original language	English
Pages (from-to)	793-799
Number of pages	7
Journal	Journal of the European Ceramic Society
Volume	25
Issue number	6
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2004.02.008
Publication status	Published - 2005 Mar

Keywords

LnSiON
Powders-solid-state reaction
Rare-earth silicon-oxynitrides
X-ray methods

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10.1016/j.jeurceramsoc.2004.02.008

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title = "Crystal structure of rare-earth silicon-oxynitride J-phases, Ln4Si2O7N2",

abstract = "Rare-earth silicon-oxynitride J-phases, Ln4Si2 O7N2 (Ln=Y, La, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu), were prepared by the N2 gas-pressured sintering method at 1 MPa of N2 and 1500-1700 °C. The Rietveld analysis was carried out for X-ray powder diffraction data measured at room temperature. The crystal structures of Ln4 Si2O7N2 were refined with the structure model of La4Si2O7N2 for Ln=La, Pr, Nd, and Sm, and with that of Lu4Si2 O7N2 for Ln=Y, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu. The refined monoclinic unit-cell parameters (lengths a, b, c, angles β, and volume V) increased linearly in their two series of Ln with increasing ionic radii of rare-earth atoms. Discontinuities of the unit-cell parameters were found between the two Ln series.",

keywords = "LnSiON, Powders-solid-state reaction, Rare-earth silicon-oxynitrides, X-ray methods",

author = "Junichi Takahashi and Hisanori Yamane and Naoto Hirosaki and Yoshinobu Yamamoto and Mamoru Mitomo and Masahiko Shimada",

year = "2005",

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T1 - Crystal structure of rare-earth silicon-oxynitride J-phases, Ln4Si2O7N2

AU - Takahashi, Junichi

AU - Yamane, Hisanori

AU - Hirosaki, Naoto

AU - Yamamoto, Yoshinobu

AU - Mitomo, Mamoru

AU - Shimada, Masahiko

PY - 2005/3

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N2 - Rare-earth silicon-oxynitride J-phases, Ln4Si2 O7N2 (Ln=Y, La, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu), were prepared by the N2 gas-pressured sintering method at 1 MPa of N2 and 1500-1700 °C. The Rietveld analysis was carried out for X-ray powder diffraction data measured at room temperature. The crystal structures of Ln4 Si2O7N2 were refined with the structure model of La4Si2O7N2 for Ln=La, Pr, Nd, and Sm, and with that of Lu4Si2 O7N2 for Ln=Y, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu. The refined monoclinic unit-cell parameters (lengths a, b, c, angles β, and volume V) increased linearly in their two series of Ln with increasing ionic radii of rare-earth atoms. Discontinuities of the unit-cell parameters were found between the two Ln series.

AB - Rare-earth silicon-oxynitride J-phases, Ln4Si2 O7N2 (Ln=Y, La, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu), were prepared by the N2 gas-pressured sintering method at 1 MPa of N2 and 1500-1700 °C. The Rietveld analysis was carried out for X-ray powder diffraction data measured at room temperature. The crystal structures of Ln4 Si2O7N2 were refined with the structure model of La4Si2O7N2 for Ln=La, Pr, Nd, and Sm, and with that of Lu4Si2 O7N2 for Ln=Y, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu. The refined monoclinic unit-cell parameters (lengths a, b, c, angles β, and volume V) increased linearly in their two series of Ln with increasing ionic radii of rare-earth atoms. Discontinuities of the unit-cell parameters were found between the two Ln series.

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KW - Powders-solid-state reaction

KW - Rare-earth silicon-oxynitrides

KW - X-ray methods

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Crystal structure of rare-earth silicon-oxynitride J-phases, Ln₄Si₂O₇N₂

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