Phase equilibria in the Gd2O3-V2O3-V2O5system at 1200.DEG.C.
スポンサーリンク
概要
- 論文の詳細を見る
The phase equilibria in the Gd<SUB>2</SUB>O<SUB>3</SUB>–V<SUB>2</SUB>O<SUB>3</SUB>–V<SUB>2</SUB>O<SUB>5</SUB> system are studied at 1200 °C by changing the oxygen partial pressure from −0.68(air) to −12.50 in terms of log<I>P</I><SUB>O<SUB>2</SUB></SUB>. In this system, Gd<SUB>2</SUB>O<SUB>3</SUB>, GdVO<SUB>4</SUB>, GdVO<SUB>3</SUB>, 0.81Gd<SUB>2</SUB>O<SUB>3</SUB>. 0.19V<SUB>2</SUB>O<SUB>5</SUB>, V<SUB>2</SUB>O<SUB>3</SUB>, V<SUB>3</SUB>O<SUB>5</SUB>, V<SUB>4</SUB>O<SUB>7</SUB>, V<SUB>5</SUB>O<SUB>9</SUB>, V<SUB>6</SUB>O<SUB>11</SUB>, V<SUB>7</SUB>O<SUB>13</SUB>, and VO<SUB>2</SUB> are stable. GdVO<SUB>4</SUB> and 0.81Gd<SUB>2</SUB>O<SUB>3</SUB>·0.19V<SUB>2</SUB>O<SUB>5</SUB> have nonstoichiometric compositions. The crystallographic properties of the latter are determined with reference to the indices of a certain compound, 4Tm<SUB>2</SUB>O<SUB>3</SUB>·V<SUB>2</SUB>O<SUB>5</SUB>. On the basis of the phase equilibria, the Gibbs free energy of these two reactions: 31/50 Gd<SUB>2</SUB>O<SUB>3</SUB>+19⁄50 GdVO<SUB>3</SUB>+19⁄100 O<SUB>2</SUB>= Gd<SUB>1.62</SUB>V<SUB>0.38</SUB>O<SUB>3.38</SUB> and: GdVO<SUB>3</SUB>+1⁄2 O<SUB>2</SUB>= GdVO<SUB>4</SUB> are determined to be 57.0 and 127.8 kJ respectively.
- 公益社団法人 日本化学会の論文
著者
-
KATSURA Takashi
Department of Chemistry
-
Kitayama Kenzo
Department Of Applied Chemistry And Biotechnology
関連論文
- Magnetic and Mossbauer Studies of a New Compound YFe_2O_4
- PRECONCENTRATION OF TRACE AMOUNT OF CADMIUM IN WATER BY "FERRITE PROCESS"
- Phase Equilibrium in the Y-Fe-O System at 1000℃
- Thermogravimetric Study of the Ln_2O_3-Co-Co_2O_3 System Ln=Sm at 1000℃
- Phase equilibria in the Ln2O3-V2O3-V2O5 (Ln=Eu and Yb) systems at 1200.DEG.C.
- Phase equilibria in the La2O3-V2O3-V2O5 system at 1200.DEG.C.
- The formation of the Cd-bearing ferrite by the air oxidation of an aqueous suspension.
- Aluminium-bearing ferrite formation from .GAMMA.-FeOOH in an aqueous suspension.
- Formation of Zn-bearing ferrite by air oxidation of aqueous suspension.
- The transformation of .GAMMA.-FeO(OH) to Fe3O4 and green rust II in an aqueous solution.
- Thermochemical Properties of Lanthanoid-Iron-Perovskite at High Temperatures
- Phase Equilibria in the V2O3–VO2 System at High Temperatures
- The Phase Equilibria in the FeO-Fe2O3-V2O3 System at 1500°K
- Phase equilibria in the Gd2O3-V2O3-V2O5system at 1200.DEG.C.
- Phase equilibria in the Ln2O3-V2O3-V2O5 (Ln=Pr,Tb, and Y) systems at 1200.DEG.C.
- Phase equilibria in Sm2O3-V2O3-V2O5 system at 1200.DEG.C.
- The formation of Mg-bearing ferrite by the air oxidation of aqueous suspensions.
- The Activity of Dilute Sodium in Liquid Au-Na Alloy
- The Thermodynamic Properties of the Nonstoichiometric Ceric Oxide at Temperatures from 900 to 1300°C
- The Standard Free Energy of the Formation of LaFeO3 at 1204°C