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TDPAC and XRPD measurements of the polycrystalline Hf2Ni phase

B. CEKIĆ1,* , S. KOIČKI2, A. UMIĆEVIĆ1, J. BELOŠEVIĆ-ČAVOR1, V. KOTESKI1, V. IVANOVSKI1

Affiliation

  1. Laboratory for Nuclear and Plasma Physics, Institute of Nuclear Sciences VINČA, P.O.Box 522, 11001 Belgrade, Serbia
  2. Serbian Academy of Sciences and Arts, Knez Mihailova 35, 11001 Belgrade, Serbia

Abstract

The high-resolution time-differential perturbed angular correlation technique (TDPAC) has been used to study the electric field gradient at 181Ta impurities in the polycrystalline intermetallic compound Hf2Ni in the wide temeperature range 78-1314 K. The single-phase BCT CuAl2 (C16)-type structure of the compound was confirmed by X-ray diffractogram, with lattice constants found to be a = 6.479(3) Å and c = 5.271(3) Å at room temperature. The coincidence measurements between gamma rays in the cascade were recorded with a time resolution better than 0.75 ns for the 133-482 keV γ-γ cascade of 181Ta nuclei. The results of measurements reveal the presence of a single nuclear quadrupole interaction (NQI) ωQ and its linear dependence with temperature in the range 78-1134 K. In the high temperature region (1134-1314 K) the significant appearance of disordering in the lattice structure of Hf2Ni was revealed, in the vicinity of the melting point of 1473 K. The XRPD measurements in the high temperature range can help in better interpretation and understanding of this complex structural and microdinamic behavior of the Hf2Ni phase..

Keywords

Time-differential perturbed angular correlation, X-ray diffraction, Intermetallic, Hf2Ni.

Submitted at: Feb. 25, 2008
Accepted at: April 4, 2008

Citation

B. CEKIĆ, S. KOIČKI, A. UMIĆEVIĆ, J. BELOŠEVIĆ-ČAVOR, V. KOTESKI, V. IVANOVSKI, TDPAC and XRPD measurements of the polycrystalline Hf2Ni phase, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 4, pp. 794-797 (2008)