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<SUB>3</SUB>, and lanthanon oxides, Ln<SUB>2</SUB>O<SUB>3</SUB>. Three phases were identified. The rhombohedral phases, LnOF, have a stoichiometric composition, and the tetragonal phases, Ln<SUB>4</SUB>O<SUB>3</SUB>F<SUB>6</SUB>, have a comparatively large nonstoichiometric composition range. The third cubic phase, with a fluorite-type structure, was observed in the SmOF-Sm<SUB>4</SUB>O<SUB>3</SUB>F<SUB>6</SUB> region after quenching from a high temperature. This establishes that both the rhombohedral SmOF and the tetragonal Sm<SUB>4</SUB>O<SUB>3</SUB>F<SUB>6</SUB> 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 pseudo-cubic from the fact that the diffraction patterns of these two phases are closely similar to that of the fluorite type.

• 公益社団法人 日本化学会の論文

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

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• 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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