Neutron diffraction measurements on deuterated Pd/Ag alloy
Hydrogen selective palladium membranes are important for technological processes of H separation and purification; Pd is usually alloyed with Ag to avoid membrane embrittlement. The electrical resistivity of a Pd100-yAgy alloy shows an unusual behaviour vs. T on hydrogenation, with a puzzling minimum around 150 °C; this was claimed to depend on a variable distribution of H atoms among different structural sites. Hence the interest of structural studies by neutron diffraction. In the previous measurements on D1B (exp. 5-25-41), data were collected at low resolution on Pd0.77Ag0.23Dx at variable T and p(D2). D is found to be located mostly on octahedral sites, but some uncertainty about possible occupation of secondary sites remains. A continuation of the experiment is proposed on the high-resolution high-intensity D20 diffractometer (with D2B as possible alternative), with the aims of (i) definitely detecting possible D location in non-octahedral sites, (ii) confirming the S-shaped behaviour of D occupancy vs. T, found at 1 bar, also at higher pressure, and (iii) checking the dependence of D uptake on pressure.
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CATTI Michele; FABELO ROSA Oscar Ramon; FILABOZZI Alessandra; GRAZZI Francesco; A. Pietropaolo; POZIO Alfonso; SUARD Emmanuelle and TOSTI Silvano. (2016). Neutron diffraction measurements on deuterated Pd/Ag alloy. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-25-247
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