Abstract
Abstract The elastic properties, adiabatic compressibility and Debye temperature of twinned and non-twinned U3Si were determined by means of an ultrasonic pulse technique between liquid helium temperature and the ambient. The twinned and non-twinned face-centred tetragonal U3Si specimens were prepared employing appropriate heat-treatment regimes. The presence of twins in the U3Si lattice yields a modulus defect of about 18·5%, the Young's modulus of the twinned U3Si having the lower absolute value. At about 85°K the twinned structure displays a prominent minimum in its elastic properties, suggesting a first-order phase transformation. In contrast, the non-twinned U3Si exhibits a maximum in this temperature range. Experimental results are discussed in terms of the effect of twins on the lattice stability of the tetragonal structure of U2Si.
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