Phase equilibria in the system Nd2O3|P2O5|H2O at 500°C under 100 MPa and synthesis of NdP5O14 crystals

Masahiro Yoshimura, Kazutaka Fujii, Shigeyuki Somiya

研究成果: Article同行評審

17 引文 斯高帕斯(Scopus)

摘要

Phase equilibria in the system Nd2O3|P2O5|H2O was studied under a hydrothermal condition at 500°C under 100 MPa by a quenching technique using encapsuled samples. Equilibria among Nd phosphates; NdP5O14, NdP3O9 and NdPO4, and liquid phase could be attained within 24 h. The stability fields for liquid (L), NdP5O14+L, NdP5O14+NdP3O9+L, NdP3O9+L, NdP3O9+NdPO4+L, NdPO4+L and NdPO4+Nd(OH)3+H2O have been determined. The composition of the liquid phase with which NdP5O14 and NdP3O9 or NdP3O9 and NdPO4 could coexist was 3% Nd2O3-80% P2O5-17% H2O or 4% Nd2O3-73% P2O5-23% H2O respectively, at 500°C under 100 MPa. A phase diagram was constructed under this condition. Crystal growth of NdP5O14 were tried under the equilibrium condition. Diamond-shaped crystals 0.3 mm in size were grown at 500°C for 4 days under 100 MPa. Crystals tended to show aggregation and surface roughness at lower growth temperatures. The crystals with polyhedral shape and maximum 0.5 mm in size were grown at 650°C.

原文English
頁(從 - 到)327-333
頁數7
期刊Materials Research Bulletin
16
發行號3
DOIs
出版狀態Published - 1981 三月

All Science Journal Classification (ASJC) codes

  • 材料科學(全部)
  • 凝聚態物理學
  • 材料力學
  • 機械工業

指紋

深入研究「Phase equilibria in the system Nd<sub>2</sub>O<sub>3</sub>|P<sub>2</sub>O<sub>5</sub>|H<sub>2</sub>O at 500°C under 100 MPa and synthesis of NdP<sub>5</sub>O<sub>14</sub> crystals」主題。共同形成了獨特的指紋。

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