Structural, magnetic, and Mössbauer effect studies of bornite

• Autorzy: Przewoźnik J. , Żukrowski J. , Gondek Ł. , Lemański A. , Kapusta C. , Piestrzyński A.
• Konferencja: Proceedings of the 9th All - Polish Seminar on Mössbauer Spectroscopy OSSM'2012, 10-13 June 2012, Lublin - Kazimierz Dolny, Poland
• Języki publikacji: EN

Abstrakty

EN

The results of a combined study of bornite with Mossbauer spectroscopy, X-ray diffraction and DC magnetometry are reported. The orthorhombic crystallographic structure of the mineral is observed at 15 K and 300 K. It exhibits an increase of the orthorhombic distortion with decreasing temperature. Magnetic susceptibility shows a Curie-Weiss like behaviour between 230 K and 380 K corresponding to the effective magnetic moment of 7.2(3) mi B per formula unit. The material undergoes a transition to an antiferromagnetic-like state at 75 K. Mossbauer spectra at the paramagnetic range are doublets with a small quadrupole splitting and the isomer shift corresponding to a high spin Fe3+ state. Upon magnetic ordering, a coexistence of the paramagnetic doublet with a broadened magnetic sextet is observed indicating an inhomogeneous character of the magnetic transition. The hyperfine field of 350 kOe at 4.2 K is much lower than that observed for a high spin Fe3+ in oxides (510 kOe) which is attributed to covalence effects and a possible copper contribution to the effective magnetic moment of the compound.

Słowa kluczowe

EN

bornite; hyperfine interactions; magnetic properties; Mössbauer spectroscopy

• Wydawca: Institute of Nuclear Chemistry and Technology
• Czasopismo: Nukleonika
• Rocznik: 2013
• Tom: Vol. 58, No. 1
• Strony: 43--46
• Opis fizyczny: Bibliogr. 10 poz., rys.

Twórcy

autor

Przewoźnik J.

autor

Żukrowski J.

autor

Gondek Ł.

autor

Lemański A.

autor

Kapusta C.

autor

Piestrzyński A.

• AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Department of Solid State Physics, al. A. Mickiewicza 30, 30-059 Krakow, Poland, Tel.: [phone], Fax: [phone],

Bibliografia

• 1. Borgheresi M, Di Benedetto F, Caneschi A, Pratesi G, Romanelli M, Sorace L (2007) An EPR and SQUID magnetometry study of bornite. Phys Chem Miner 34:609–619
• 2. Collins MF, Longworth G, Townsend MG (1981) Magnetic structure of bornite, Cu5 FeS4. Can J Phys 59:535–539
• 3. Grguric BA, Putnis A, Harrison RJ (1998) An investigation of the phase transitions in bornite (Cu5 FeS4) using neutron diffraction and differential scanning calorimetry. Am Miner 83:1231–1239
• 4. Jagadeesh MS, Nagarathna HM, Montano PA, Seehra MS (1981) Magnetic and Mössbauer studies of phase transitions and mixed valences in bornite (Cu4.5Fe1.2S4.7). Phys Rev B 23:2350–2356
• 5. Koto K, Morimoto N (1975) Superstructure investigation of bornite, Cu5 FeS4, by the modified partial Patterson function. Acta Crystallogr B 31:2268–2273
• 6. Oak HN, Baek KS, Jo Y (1996) Superparamagnetic relaxation in Cu5 FeS4. Solid State Commun 100:467–470
• 7. Rancourt DG, Ping JY (1991) Voigt-based methods for arbitrary shape static hyperfine parameter distributions in Mössbauer spectroscopy. Nucl Instrum Meth B 58:85–97
• 8. Rancourt DG (1989) Accurate site populations from Mössbauer spectroscopy. Nucl Instrum Meth B 44:199–210
• 9. Rodriguez-Carvajal J (1993) Recent advances in magnetic structure determination by neutron powder diffraction. Physica B 192:55–69
• 10. Van der Laan G, Pattrick RAD, Charnock JM, Grguric BA (2002) Cu L2,3 x-ray absorption and the electronic structure of nonstoichiometric Cu5FeS4. Phys Rev B 66:045104 (5 pp)