Position of Fe ions in MgO crystalline structure

• Autorzy: Jacek Szczerba , Ryszard Prorok , Paweł Stoch , Edyta Śnieżek , Ilona Jastrzębska
• Języki publikacji: EN

Abstrakty

EN

Magnesium oxide (MgO) is one of the most important raw materials in many branches of industry. Magnesium oxide is a popular refractory raw material because of its high refractoriness and high resistance to basic slags and environment. In many cases, use of MgO is limited by its properties, especially the presence of secondary phases like iron oxides. The amount and distribution of iron oxides can strongly influence the technological properties of MgO and depend on the manufacturing method, particularly the heat-treatment process. The aim of the study was to evaluate the influence of the heat-treatment process on amount and distribution of iron ions in a magnesium oxide lattice. The 57Fe Mössbauer effect measurements of fused and sintered magnesium oxide samples doped by the iron oxide were conducted. Investigation reveals in both cases the presence of Fe2+ as well as Fe3+ ions. Fe2+ ions occupy Mg2+ octahedral sites in the MgO lattice, whereas the Fe3+ ions are located in highly distorted octahedral coordination. The amount of Fe2+ varies from around 66% for fused samples to 30% for sintered samples.

Słowa kluczowe

EN

Mössbauer spectroscopy; MgO; Fe ions; crystal structure

• Czasopismo: Nukleonika
• Rocznik: 2015
• Tom: 60
• Numer: 1
• Strony: 143-145

Daty

wydano

2015-03-01

otrzymano

2014-06-18

zaakceptowano

2014-11-02

online

2015-03-12

Twórcy

autor

Jacek Szczerba

• Department of Ceramics and Refractories, Faculty of Material Science and Ceramics, AGH – University of Science and Technology, 30 A. Mickiewicza Ave., 30-059 Kraków, Poland, Tel.: [phone], Fax: [phone]

autor

Ryszard Prorok

• Department of Ceramics and Refractories, Faculty of Material Science and Ceramics, AGH – University of Science and Technology, 30 A. Mickiewicza Ave., 30-059 Kraków, Poland, Tel.: [phone], Fax: [phone],

autor

Paweł Stoch

• Department of Ceramics and Refractories, Faculty of Material Science and Ceramics, AGH – University of Science and Technology, 30 A. Mickiewicza Ave., 30-059 Kraków, Poland, Tel.: [phone], Fax: [phone]

autor

Edyta Śnieżek

• Department of Ceramics and Refractories, Faculty of Material Science and Ceramics, AGH – University of Science and Technology, 30 A. Mickiewicza Ave., 30-059 Kraków, Poland, Tel.: [phone], Fax: [phone]

autor

Ilona Jastrzębska

• Department of Ceramics and Refractories, Faculty of Material Science and Ceramics, AGH – University of Science and Technology, 30 A. Mickiewicza Ave., 30-059 Kraków, Poland, Tel.: [phone], Fax: [phone]

Bibliografia

• 1. Shannon, R. D., & Prewitt, C. T. (1969). Effective ionic radii in oxides and fluorides. Acta Crystallogr. Sect. B-Struct. Sci., 25 (5), 925–946. DOI: 10.1107/S0567740869003220.[Crossref]
• 2. Antao, S. M., Hassan, I., & Parise, J. B. (2005). Cation ordering in magnesioferrite MgFe2O4 to 982°C using in situ synchrotron X ray powder diffraction. Am. Miner., 90(1), 219–228. DOI: 10.2138/am.2005.1559.[Crossref]
• 3. Philips, B., Sõmiya, S., & Muan, A. (1961). Melting relations of magnesium oxide-iron oxide mixtures in air. J. Am. Ceram. Soc., 44(4), 167–169. DOI: 10.1111/j.1151-2916.1961.tb13738.x.[Crossref]
• 4. Waychunas, G. A. (1983). Mössbauer, EXAFS, and X-ray diffraction study of Fe3+ clusters in MgO:Fe and magnesiowüstite (Mg,Fe)1-xO-evidence for specific cluster geometries. J. Mater. Sci., 18(1), 195–207. DOI: 10.1007/BF00543826.[Crossref]
• 5. Perez, A., Marest, G., Sawicka, B. D., Sawicki, J. A., & Tyliszczak, T. (1983). Iron-ion – implantation effects in MgO crystals. Phys. Rev. B, 28(3), 1227–1238. DOI: 10.1103/PhysRevB.28.1227.[Crossref]
• 6. Bhide, V. G., & Tambe, B. R. (1969). Investigation of the MgO:Fe system using the Mössbauer effect. J. Mater. Sci., 4(11), 955–961. DOI: 10.1007/BF00555310.[Crossref]

Identyfikatory

DOI

10.1515/nuka-2015-0024