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TiPd Shape Memory Alloy Studied by PAC Method

100%
Kulińska A., Wodniecki P.
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vol. 125
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issue 4
936-939
EN
Perturbed angular correlation (PAC) method was applied to study the martensitic phase transition of the TiPd shape memory alloy doped with In, Hf, and Zr. The hyperfine interaction parameters and their concentration and temperature dependences for ^{111}In/^{111}Cd and ^{181}Hf/^{181}Ta probe atoms were determined. The influence of ternary element additions on the electric field gradients at Pd site was evidenced. A decrease of the martensite start temperature (M_{S}) and an increase of the width of the hysteresis loop (T_{H}) with an increasing concentration of the impurities in TiPd alloy was observed. These relationships are much stronger for In and Zr, than for Hf admixture.
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Au-In System Studied with Perturbed Angular Correlation Method

81%
Wodniecki P., Kulińska A., Wodniecka B.
Acta Physica Polonica A
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2001
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vol. 100
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issue 5
817-822
EN
The Au-In system was the subject of our comprehensive study with the perturbed angular correlation technique. Bulk samples of all intermetallic phases shown in the phase diagram were prepared to determine the hyperfine interaction parameters and their temperature dependence. A polymorphic phase transformation in the AuIn phase at about 630 K and a new metastable modification of Au_7In_3 after quenching the sample of 30 at.% In from temperature above 700 K were found. In addition, formation of the Au-In phases of different stoichiometries at the interfaces of thin Au/In films was observed. It turned out that the starting composition of bilayer samples, i.e. the thickness ratio of the Au and In layers, strongly influenced the stoichiometry of the formed compounds.
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Perturbed γ-γ Angular Correlation Studies of Isostructural Ag_{5}Zn_{8} and Ag_{5}Cd_{8} Intermetallic Compounds

81%
Wodniecki P., Wodniecka B., Marszałek M., Hrynkiewicz Α. Z.
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EN
Perturbed γ-γ angular correlation spectroscopy was applied to study hyperfine interaction parameters for ^{111}In probes in intermetallic compounds of D8_{2} structure. The perturbed γ-γ angular correlation spectra measured in Ag_{5}Zn_{8} and Ag_{5}Cd_{8} phases reflect a number, population and symmetry of nonequivalent substitutional sites occupied by the indium probes. The temperature dependences of the observed electric field gradients were measured in the temperature range 37-500 K
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