The Crystal Structure and Nonstoichiometry of Rare Earth Oxyfluoride

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概要

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• Oxyfluoride phases for the rare earth Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Y have been prepared by heating a mixture of lanthanon fluorides, LnF_3, and lanthanon oxides, Ln_2O_3. Three phases were identified. The rhombohedral phases, LnOF, have a stoichiometric composition, and the tetragonal phases, Ln_4O_3F_6, have a comparatively large nonstoichiometric composition range. The third cubic phase, with a fluorite-type structure, was observed in the SmOF-Sm_4O_3F_6 region after quenching from a high temperature. This establishes that both the rhombohedral SmOF and the tetragonal Sm_4O_3F_6 transform to the cubic phase and form a complete solid solution in the high-temperature range. It is postulated that the rhombohedral and tetragonal phases are pseudocubic from the fact that the diffraction patterns of these two phases are closely similar to that of the fluorite type.

• 東北大学の論文

著者

• Niihara Koichi

  The Research Institute For Iron Steel And Other Metals

• Yajima Seishi

  The Research Institute For Iron Steel And Other Metals

関連論文

• Siliconated Pyrolytic Graphite : Part 1. Preparation and Some Properties
• Chemical Bond of CVD-Si_3N_4 by Compton Scattering Measurement
• Field-Cooling Effect in the Amorphous Magnetic Oxide
• The Preparation and Crystal Structure of Ternary Rare Earth Borides, RCo_3B_2
• Siliconated Pyrolytic Graphite : Part 4. Electrical Resistivity
• Microstructure and Density of Pyrolytic Graphite
• Mechanism of the Pyrolytic Graphite Formation
• The Crystal Data of Ternary Rare Earth Borides, RCo_2B_2
• Neutron Irradiation Effects in Amorphous Pd-Si Alloy
• Magnetocrystalline Anisotropy of Y_(Co_Fe_y)_ Intermetallic Compounds
• Magnetocrystalline Anisotropy of Nonstoichiometric Y_Co_
• Preparation and Thermal Expansion of Pyrolytic Graphite-Bromine Residual Compounds
• The Electrical Anisotropies of Pyrolytic Graphite and Its Compounds
• Siliconated Pyrolytic Graphite : Part 2. The State of Silicon Present in Siliconated Pyrolytic Graphite
• Siliconated Pyrolytic Graphite : Part 3. Structural Features
• Chemical Vapor-Deposited Amorphous Silicon Nitride
• High Temperature Resistivity of Pyrolytic Graphite Bromine Residual Compounds
• Semiconducting Properties of Ln_2CuO_4 (Ln=Rare earths)
• Some Doping Effects on the Semiconducting Properties of Gd_2CuO_4
• The Crystal Structure and Nonstoichiometry of Rare Earth Oxyfluoride
• The Nonstoichiometry of Gadolinium Ditelluride
• The Crystal Data of Ternary Rare Earth Borides, RCo2B2
• The Crystal Structure and Nonstoichiometry of Rare Earth Oxyfluoride

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