Abstract
The phase transition in the alloys Pd0.8 Si0.2 and Pd0.75 Si0.20 Ag0.05 have been investigated through the quadrupole interaction of111Cd impurities. The quadrupole interactions were measured by means of the TDPAC technique from room temperature up to about 870 K. The variation of the quadrupole interaction with temperature in the alloy PdSiAg shows aT 3/2 dependence below and above 629 K, with coefficientsB=5.43(25)·10−5 K−3/2 andB=3.70(15)·10−5 K−3/2, respectively. This demonstrates that the alloy undergoes a phase transition around 629 K. The existence of two electric field gradients observed in the alloy PdSi,V zz (1)=3.47(54)·1017 V/cm2 andV zz (2)=2.29(36)·1017 V/cm2, indicates that there are two different111Cd sites. The corresponding fractionsf 1 andf 2 strongly depend on temperature. Below 520 K, most111Cd nuclei are subject to the higher EFGV zz (1) (f 1≈70%), whereas above 520 Kf 1 falls rapidly to zero andV zz (2) becomes dominant. The temperature dependences of thef 1 andf 2 reveal a picture of the phase transition between the two crystal structures.
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Shengyun, Z., Tao, Z. & Minli, D. Structural phase transitions in Pd0.8 Si0.2 and Pd0.75 Si0.20 Ag0.05 alloys observed by pac. Hyperfine Interact 39, 17–22 (1988). https://doi.org/10.1007/BF02394643
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DOI: https://doi.org/10.1007/BF02394643