Filters
Results 1 - 10 of 29
Results 1 - 10 of 29.
Search took: 0.021 seconds
| Sort by: date | relevance |
[en] Results of Moessbauer, magnetic and X-ray diffraction measurements of Fe3-xCoxAl system are presented. At small concentration of Co the structure is of DO3-type. For x=0.5, Fe3-xCoxAl is located on the ternary Fe-Co-Al phase diagram in the region where two crystallographic phases coexists. It is shown how the presence of Co modifies the lattice parameter and the Debye temperature. Dependence of these two parameters on x are discussed and qualitatively explained as due to the lattice shrinking caused by Co-Al pair interaction. The magnetic moment of Co is estimated to be approximately equal to 0.5 μB at x=0.0 and 1.1 μB at x=2.0. The magnetic moment of Fe seems constant and equal to approximately 1.9 μB for x<1 and increases to 2.7 μB at x=2.0. Dependence of the average isomer shift on x and presence of one component only in the spectrum of FeCo2Al indicate that Co locates preferentially at (A,C) sites which could have been expected based on earlier data. It is shown that a simple model of the disorder described by the binomial distribution and linear dependence of the hyperfine field of impurity atoms in the nearest neighbourhood is not adequate for description of the observed hyperfine magnetic field distribution
Journal
Journal of Magnetism and Magnetic Materials; ISSN 0304-8853; 
; CODEN JMMMDC; v. 210(1-3); p. 150-162
; CODEN JMMMDC; v. 210(1-3); p. 150-162
No abstract available
Source
Chmielewska, D.; Infeld, E.; Preibisz, Z.; Zupranski, P. (eds.); The Andrzej Soltan Institute for Nuclear Studies, Otwock-Swierk (Poland); 195 p; ISSN 1232-5309; ; 2003; p. 171; Also available from http://www.ipj.gov.pl
; 2003; p. 171; Also available from http://www.ipj.gov.pl
No abstract available
Source
Chmielewska, D.; Infeld, E.; Preibisz, Z.; Zupranski, P. (eds.); The Andrzej Soltan Institute for Nuclear Studies, Otwock-Swierk (Poland); 195 p; ISSN 1232-5309; ; 2003; p. 171; Also available from http://www.ipj.gov.pl
; 2003; p. 171; Also available from http://www.ipj.gov.pl
No abstract available
Source
Chmielewska, D.; Infeld, E.; Zupranski, P. (The Andrzej Soltan Institute for Nuclear Studies, Swierk-Otwock (Poland)) (eds.); Andrzej Soltan Institute for Nuclear Studies, Swierk-Otwock (Poland); 208 p; ISSN 1232-5309; ; Jun 2006; p. 191-192; Also available from http://www.ipj.gov.pl/common/annual2005
; Jun 2006; p. 191-192; Also available from http://www.ipj.gov.pl/common/annual2005
[en] Complete text of publication follows. Uranium ternary compounds UFexAl12-x crystallize in a body-centred tetragonal structure ThMn12 (I 4/mmm No. 139). The neutron powder diffraction, magnetization measurements as well as Moessbauer investigations using a monochromatic, circularly polarized source [1], clearly indicate the magnetic ordering within the iron sites. The rearrangement of iron magnetic moments from uncompensated antiferromagnetic system in the case of UFexAl12-x with x < 4, through coexistence of antiferro- and ferromagnetic iron components (4 ≤ x < 5) to pure ferromagnetic ordering for alloy with x = 5 is observed. Unfortunately, for all the samples, the magnetic neutron scattering is generally weak when compared with the nuclear one. In order to extract magnetic part of scattering one should thus be particularly careful in taking proper account of the thermal vibration effects. The Debye temperatures were determined using novel method proposed in [2] and from the thermal dependence of the Debye-Walter factors. Good agreement of both sets of data was found. This allowed one to reanalyse full set of neutron data and check the validity of previously postulated models of magnetic ordering in the family of alloys of our interest. (author) [1] K. Szymanski, K. Recko, L. Dobrzynski, D. Satula, J. Phys.: Condens. Matter in press.; [2] F. Sayetat, P. Fertey, M. Kessler, J. Appl. Cryst. 31 (1998) 121-127
Source
Cser, L.; Grosz, T.; Rosta, L. (eds.); 361 p; ISBN 963-03-7969-4; ; 1999; p. 183; ECNS'99. 2. European conference on neutron scattering; Budapest (Hungary); 1-4 Sep 1999
; 1999; p. 183; ECNS'99. 2. European conference on neutron scattering; Budapest (Hungary); 1-4 Sep 1999
No abstract available
Source
Chmielewska, D.; Infeld, E.; Preibisz, Z.; Zupranski, P. (eds.); The Andrzej Soltan Institute for Nuclear Studies, Otwock-Swierk (Poland); 195 p; ISSN 1232-5309; ; 2003; p. 172; Also available from http://www.ipj.gov.pl; 2 refs.
; 2003; p. 172; Also available from http://www.ipj.gov.pl; 2 refs.
No abstract available
Source
Chmielewska, D.; Infeld, E.; Preibisz, Z.; Zupranski, P. (eds.); The Andrzej Soltan Institute for Nuclear Studies, Otwock-Swierk (Poland); 195 p; ISSN 1232-5309; ; 2003; p. 172; Also available from http://www.ipj.gov.pl; 2 refs.
; 2003; p. 172; Also available from http://www.ipj.gov.pl; 2 refs.
No abstract available
Source
Chmielewska, D.; Infeld, E.; Zupranski, P. (The Andrzej Soltan Institute for Nuclear Studies, Swierk-Otwock (Poland)) (eds.); Andrzej Soltan Institute for Nuclear Studies, Swierk-Otwock (Poland); 208 p; ISSN 1232-5309; ; Jun 2006; p. 191; Also available from http://www.ipj.gov.pl/common/annual2005
; Jun 2006; p. 191; Also available from http://www.ipj.gov.pl/common/annual2005
No abstract available
Source
Chmielewska, D.; Infeld, E.; Preibisz, Z.; Zupranski, P. (eds.); The Andrzej Soltan Institute for Nuclear Studies, Otwock-Swierk (Poland); 202 p; ISSN 1232-5309; ; 2000; p. 186
; 2000; p. 186
[en] Positron lifetime spectra for Zn(1-x)MgxSe compounds with different magnesium content and different crystal structures have been measured. For all investigated samples positron lifetime component corresponding to divacancy type of defects has been found. The decrease in the intensity of this component with increasing magnesium content is due to lowering concentration of divacancies. Slight rise in bulk lifetime with increasing magnesium content, from 251 to 281 ps, was observed. (author). 6 refs, 3 tabs
Journal
| 1 | 2 | 3 | Next |