1. bookVolume 60 (2015): Issue 1 (March 2015)
Journal Details
License
Format
Journal
eISSN
1508-5791
First Published
25 Mar 2014
Publication timeframe
4 times per year
Languages
English
Open Access

Determination of hyperfine fields and atomic ordering in NiMnFeGe exhibiting martensitic transformation

Published Online: 12 Mar 2015
Volume & Issue: Volume 60 (2015) - Issue 1 (March 2015)
Page range: 127 - 131
Received: 18 Jun 2014
Accepted: 17 Nov 2014
Journal Details
License
Format
Journal
eISSN
1508-5791
First Published
25 Mar 2014
Publication timeframe
4 times per year
Languages
English
Abstract

The hyperfine fields and atomic ordering in Ni1−xFexMnGe (x = 0.1, 0.2, 0.3) alloys were investigated using X-ray diffraction and Mössbauer spectroscopy at room temperature. The X-ray diffraction measurements show that the samples with x = 0.2, 0.3 crystallized in the hexagonal Ni2In-type of structure, whereas in the sample with x = 0.1, the coexistence of two phases, Ni2In- and orthorhombic TiNiSi-type of structures, were found. The Mössbauer spectra measured with x = 0.2, 0.3 show three doublets with different values of isomer shift (IS) and quadrupole splitting (QS) related to three different local surroundings of Fe atoms in the hexagonal Ni2In-type structure. It was shown that Fe atoms in the hexagonal Ni2In-type structure of as-cast Ni1−xFexMnGe alloys are preferentially located in Ni sites and small amount of Fe is located in Mn and probably in Ge sites. The spectrum for x = 0.1 shows the doublets in the central part of spectrum and a broad sextet. The doublets originate from the Fe atoms in the paramagnetic state of hexagonal Ni2In-type structure, whereas the sextet results from the Fe atoms in orthorhombic TiNiSi-type structure.

Keywords

1. Koyama, K., Sakai, M., Kanomata, T., & Watanabe, K. (2004). Field-induced martensitic transformation in new ferromagnetic shape memory compound Mn1.07Co0.92Ge. Jpn. J. Appl. Phys., 43, 8036–8039. DOI:10.1143/JJAP.43.8036.10.1143/JJAP.43.8036Search in Google Scholar

2. Liu, E., Wang, W., Feng, L., Zhu, W., Li, G., Chen, J., Zhang, H., Wu, G., Jiang, C., Xu, H., & de Boer, F. (2012). Stable magnetostructural coupling with tunable magnetoresponsive effects in hexagonal ferromagnets. Nat. Commun., 3, 873-p10. DOI: 10.1038/ncomms1868.10.1038/ncomms1868Search in Google Scholar

3. Liu, E. K., Zhu, W., Feng, L., Chen, J. L., Wang, W. H., & Wu, G. H. (2010). Vacancy-tuned paramagnetic/ferromagnetic martensitic transformation in Mn-poor Mn1-xCoGe alloys. EPL, 91, 17003-p5. DOI:10.1209/0295-5075/91/17003.10.1209/0295-5075/91/17003Search in Google Scholar

4. Trung, N. T., Zhang, L., Caron, L., Buschow, K. H. J., & Brück, E. (2010). Giant magnetocaloric effects by tailoring the phase transitions. Appl. Phys. Lett., 96, 172503–172504. DOI:10.1063/1.3399773.10.1063/1.3399773Search in Google Scholar

5. Zhang, C. L., Wang, H. D., Cao, Q. Q., Han, Z. D., Xuan, H. C., & Du, Y. W. (2008). Magnetostructural phase transition and magnetocaloric effect in off-stoichiometric Mn1.9-xNixGe alloys. Appl. Phys. Lett., 93, 122505-3p. DOI:10.1063/1.2990649.10.1063/1.2990649Search in Google Scholar

6. Bażela, W., Szytuła, A., Todorović, J., Tomkowicz, Z., & Zięba, A. (1976). Crystal and magnetic structure of NiMnGe. Phys. Status Solidi A-Appl. Mat., 38, 721–729. DOI: 10.1002/pssa.2210380235.10.1002/pssa.2210380235Search in Google Scholar

7. Fjellvåg, H., & Andresen, A. F. (1985). On the crystal structure and magnetic properties of MnNiGe. J. Magn. Magn. Mater., 50, 291–297. DOI: 10.1016/0304-8853(85)90065-4.10.1016/0304-8853(85)90065-4Search in Google Scholar

8. Satuła, D., Dobrzyński, L., Waliszewski, J., Szymański, K., Rećko, K., Malinowski, A., Brückel, Th., Schärpf, O., & Blinowski, K. (1997). Structural and magnetic properties of Fe-Cr-Al alloys with DO3-type of structure. J. Magn. Magn. Mater., 169, 240–252. DOI: 10.1016/S0304-8853(96)00758-5.10.1016/S0304-8853(96)00758-5Search in Google Scholar

9. Satuła, D., Szymański, K., Dobrzyński, L., Waliszewski, J., & Malinowski, A. (1995). Local environments effects and site preference in Fe3-xCrxAl alloys. J. Magn. Magn. Mater., 140/144, 61–62. DOI: 10.1016/0304-8853(94)01049-8.10.1016/0304-8853(94)01049-8Search in Google Scholar

10. Szymański, K., Biernacka, M., Dobrzyński, L., Perzyńska, K., Rećko, K., Satuła, D., Waliszewski, J., & Zaleski, P. (2000). Mössbauer and magnetic studies of Fe3-xCoxAl. J. Magn. Magn. Mater., 210, 150–162. DOI: 10.1016/S0304-8853(99)00644-7.10.1016/S0304-8853(99)00644-7Search in Google Scholar

11. Akai, H., Blügel, S., Zeller, R., & Dederichs, P. H. (1986). Isomer shifts and relation to charge transfer in dilute Fe alloys. Phys. Rev. Lett., 56, 2407–2410. DOI: 10.1016/0304-8853(86)90401-4.10.1016/0304-8853(86)90401-4Search in Google Scholar

Recommended articles from Trend MD

Plan your remote conference with Sciendo