Temperature behavior of ZrPt compound studied by PAC with 181Ta and 111Cd probes

ZrPt intermetallic compound was studied by perturbed angular correlation (PAC) method. The hyperfine interaction parameters and their temperature dependences for 181Hf/181Ta and 111In/111Cd radioactive probes were determined. An unusual temperature dependence of hyperfine interaction parameters for 181Ta probe atoms points to the appearance of a monoclinic variant of CrB-type phase below 573 K and confirms the existence of the orthorhombic Bf-type phase at temperatures up to 1023 K.