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Phase equilibria in the systems Ln–Pd–O and thermodynamic properties of $Ln_2Pd_2O_5$ (Ln=Dy, Ho)

Jacob, Thomas K and Lwin, Kay Thi and Waseda, Yoshio (2003) Phase equilibria in the systems Ln–Pd–O and thermodynamic properties of $Ln_2Pd_2O_5$ (Ln=Dy, Ho). In: Materials Chemistry and Physics, 77 (2). pp. 331-340.

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Abstract

Isothermal sections of the phase diagrams for the systems Ln–Pd–O (Ln=Dy, Ho) at 1223 K have been established by isothermal equilibration of samples at high temperature, and phase identification after quenching by optical and scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X-ray powder diffraction (XRPD). The binary oxide PdO was not stable at 1223 K. The oxide phase, $Ln_2O_3$ was stable along the binary Ln–O. Only one ternary oxide $Ln_2Pd_2O_5$ was identified in the two systems under investigation. Liquid alloys, the six intermetallic compounds $(Ln_3Pd_2, LnPd, Ln_3Pd_4, Ln_2Pd_3, Ln_1_0Pd_2_1 and LnPd_3)$ and Pd-rich solid solution were found to be in equilibrium with $Ln_2O_3$.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier.
Keywords: Phase diagrams;Systems Dy–Pd–O and Ho–Pd–O;Compounds Dy2Pd2O5 and Ho2Pd2O5;Gibbs energy; Enthalpy;Entropy
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 19 Jan 2007
Last Modified: 19 Sep 2010 04:28
URI: http://eprints.iisc.ernet.in/id/eprint/7220

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