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The Thermal Stability of R3Pt4 Compounds

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Alloys of the rare earths R (including La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Y, Ho, Er) with platinum, having the composition R3Pt4, have been synthesized and investigated by X-ray diffraction (XRD) and differential thermal analysis (DTA). At temperatures above about 900 °C and below 250 °C, all the single phases R3Pt4 are formed, which crystallize with the same structure of the rhombohedral Pu3Pd4 type. Over the temperature range of about 250 °C to 900 °C, they occur at an eutectoid decomposition into RPt and RPt2 compounds neighboring in the corresponding phase diagram, R3Pt4 → RPt + RPt2. The stability of these phases R3Pt4 may be restricted to a radius ratio r R/r Pt range of 1.27 to 1.35.

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Acknowledgment

This work was supported by the National Natural Science Foundation of China (Grant Nos. 50261002 and 50661002).

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Authors and Affiliations

  1. Department of Mechanical Engineering, Guilin College of Aerospace Technology, Guilin, Guangxi, 541004, People’s Republic of China

    CH.F. Xu (Research Scholar), Y.Y. Lin (Research Scholar) & X.M. Liu (Professor)

  2. Department of Information Materials Science and Engineering, Guilin University of Electronic Technology, Guilin, Guangxi, 541004, People’s Republic of China

    Z.F. Gu (Professor), G. Cheng (Professor), J. Ren (Research Scholar) & H.Y. Zhou (Professor)

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  1. CH.F. Xu
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  2. Z.F. Gu
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  3. G. Cheng
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  4. J. Ren
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  5. H.Y. Zhou
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  7. X.M. Liu
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Correspondence to CH.F. Xu.

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Manuscript submitted May 7, 2009.

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Xu, C., Gu, Z., Cheng, G. et al. The Thermal Stability of R3Pt4 Compounds. Metall Mater Trans A 41, 57–60 (2010). https://doi.org/10.1007/s11661-009-0077-x

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