The hafnium aluminides HfAl3 and Hf2Al3 studied by perturbed angular correlations with 181Ta and 111Cd probes

Wodniecki, P.; Wodniecka, B.; Kulińska, A.; Uhrmacher, M.; Lieb, Klaus‐Peter

doi:10.1016/s0925-8388(00)01124-5

Cited by 25 publications

(12 citation statements)

References 13 publications

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“…The PAC spectra for 181 Ta probes in Zr 2 Al 3 and Hf 2 Al 3 phases exhibit a single, well defined EFGs with rather high asymmetry parameter values [4,5]. This unique EFGs correspond to the unique Hf(Zr) 16(b) crystallographic site occupied by the 181 Ta probes.…”

Section: Pac Results and Discussionmentioning

confidence: 95%

Lattice Location of 181Ta and 111Cd Probes in Hafnium and Zirconium Aluminides Studied by Perturbed Angular Correlation

et al. 2004

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The perturbed angular correlation technique was applied to study the lattice location of the 111 In/ 111 Cd and 181 Hf/ 181 Ta probe atoms in hafnium and zirconium aluminides. Compounds of different stoichiometries and crystallographic structures were the subject of investigation. According to the expectation, in all investigated compounds 181 Hf/ 181 Ta probes occupy the Hf(Zr) crystallographic sites. The 111 In/ 111 Cd probes are placed at the sites of all constituent metals Y aluminum, hafnium and zirconium, depending on the crystallographic structure of compound, concentration of the constituent metals and temperature of the sample.

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Section: Pac Results and Discussionmentioning

confidence: 95%

Lattice Location of 181Ta and 111Cd Probes in Hafnium and Zirconium Aluminides Studied by Perturbed Angular Correlation

et al. 2004

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“…2c). All three hafnium aluminides mentioned above were already the subject of our former PAC investigations, therefore, the EFG parameters for the 181 Ta probes in these lattices are well known [3][4][5]. Thus, in the PAC measurement for the mechanically alloyed HfAl 2 sample each of them should be easily identified.…”

Section: Pac and Xrd Measurements For Mechanically Alloyed Hfal 2 Commentioning

confidence: 92%

“…Powdering of the bulk sample was performed successively and after each step the PAC measurement was executed at room temperature. Details of the PAC apparatus used and data analysis have been reported previously [3,4]. After some of the milling steps, a part of the same sample was analyzed in the XRD experiment to follow the evolution of the crystal structure and of the grain dimensions.…”

Section: Methodsmentioning

confidence: 99%

“…The hyperfine interaction parameters for 181 Hf/ 181 Ta probes placed in the low temperature phase were reported in Ref. [3] (Table 1). In the experiments presented here the HfAl 3 bulk sample was successively milled for 5, 10, 20, 30 and 60 min (total times of milling).…”

Section: Ball Milling Of the Bulk Hfal 3 Compoundmentioning

confidence: 99%

“…One of them of dominant contribution (ca. 60%), has the EFG typical for the lt phase (D0 23 ) [3]. Second one is attributed to the ht phase (D0 22 ), which was created as the consequence of the arc melting followed by a fast cooling down to the room temperature.…”

Section: Ball Milling Of the Bulk Hfal 3 Compoundmentioning

confidence: 99%

See 2 more Smart Citations

Electric field gradients in nanoparticles of HfAl2 and HfAl3 intermetallic compounds

Kulińska

Wodniecki

2010

Hyperfine Interact

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Perturbed angular correlation (PAC) method was applied to study the electric field gradients in nanopowders of the HfAl 2 and HfAl 3 intermetallic compounds, obtained via mechanical alloying or after ball milling of the thermally alloyed compound. The influence of the ball milling procedure on the experimentally obtained hyperfine interaction parameters was determined. A strong dependence of the PAC pattern on the milling time was evidenced and attributed to the structural disorder. The thickness of the outer damaged part of the grains depends on the crystallographic structure of the milled material. In HfAl 3 sample the influence of the milling procedure on the phase transformation was observed.

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ZrAg and Zr₂Ag phases studiedby perturbed angular correlation with ¹⁸¹Ta probes

Wodniecki

Wodniecka

Kulińska

2003

Physica Status Solidi (b)

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The electric quadrupole hyperfine interactions for 181 Hf/ 181 Ta probes in polycrystalline ZrAg and Zr 2 Ag were measured in the temperature range 24 -1100 K and compared with the results of previous experiments on isostructural Hf -Ag compounds. For both phases one unique quadrupole frequency ν Q with asymmetry parameter η = 0 was observed in accordance with the B11 and C11 b structures of the ZrAg and Zr 2 Ag phases, respectively. On the basis of the chemical similarities of Zr and Hf, the 181 Hf probes can be considered as the constituent atoms in Zr -Ag alloys. In both matrices they were found to substitute the Zr site.

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The hafnium aluminides HfAl3 and Hf2Al3 studied by perturbed angular correlations with 181Ta and 111Cd probes

Cited by 25 publications

References 13 publications

Lattice Location of 181Ta and 111Cd Probes in Hafnium and Zirconium Aluminides Studied by Perturbed Angular Correlation

Lattice Location of 181Ta and 111Cd Probes in Hafnium and Zirconium Aluminides Studied by Perturbed Angular Correlation

Electric field gradients in nanoparticles of HfAl2 and HfAl3 intermetallic compounds

ZrAg and Zr₂Ag phases studiedby perturbed angular correlation with ¹⁸¹Ta probes

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The hafnium aluminides HfAl3 and Hf2Al3 studied by perturbed angular correlations with 181Ta and 111Cd probes

Cited by 25 publications

References 13 publications

Lattice Location of 181Ta and 111Cd Probes in Hafnium and Zirconium Aluminides Studied by Perturbed Angular Correlation

Lattice Location of 181Ta and 111Cd Probes in Hafnium and Zirconium Aluminides Studied by Perturbed Angular Correlation

Electric field gradients in nanoparticles of HfAl2 and HfAl3 intermetallic compounds

ZrAg and Zr2Ag phases studiedby perturbed angular correlation with 181Ta probes

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ZrAg and Zr₂Ag phases studiedby perturbed angular correlation with ¹⁸¹Ta probes