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Decomposition of the Interstitial Solid Solution Pd(B)

  • Markus Beck and Eric J. Mittemeijer EMAIL logo
Published/Copyright: December 13, 2021
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Abstract

The decomposition at 628 K of a Pd(B) solid solution containing 6 at.% boron was analyzed by use of, primarily, X-ray diffraction. A structure model was used to simulate the X-ray diffraction-line profiles. The decomposition is described as the precipitation of a boron-poor face-centered cubic (fcc) phase in the parent fcc phase gradually enriching in boron. The experimentally determined width of the miscibility gap is different from previous experimental results, but agrees with theoretical data obtained on the basis of the quasi-chemical approximation. Further, the micro-strain in the decomposed state was measured and compared with that of the initial, quenched supersaturated solid solution; good agreement is observed between results obtained from X-ray diffractometry and transmission electron microscopy.


Prof. Dr. Ir. E.J. Mittemmeijer Max Planck Institut for Metals Research Seestr. 92, D-70174 Stuttgart, Germany Tel:+49 7112095418 Fax:+49 711 2095420

  1. *

    PV(2θ) = I0[L(2θ)2 + G(2θ)] with Lorentzian component L(2θ) = η/[1 + CL(2θ – 2θ0)2], where CL=1/wL2, and with Gaussian component G(2θ) = (1 – η) exp[–CG(2θ – 2θ0)2], where CG=ln2/wG2 (wL, wG = FWHM of L(2θ) and G(2θ), respectively, and η = mixing parameter) and with I0 as a constant.

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Received: 2001-08-01
Published Online: 2021-12-13

© 2001 Carl Hanser Verlag, München

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