Prossima pubblicazione.
Referenza:
▪ Galuskin, E.V., Galuskina, I.O., Widmer, R., Armbruster, T. (2018): First natural hexaferrite with mixed β'-ferrite (β-alumina) and magnetoplumbite structure from Jabel Harmun, Palestinian Autonomy. European Journal of Mineralogy, 30, (in press).
Abstract:
Ferrites of K and Ba close in composition to the known synthetic compounds KFe22+Fe153+O25 and BaMg2Fe163+O27 were found in a thin vein, filled with magnesioferrite and khesinite, in pyrometamorphic flamite–gehlenite hornfels of the Hatrurim Complex, Palestinian Autonomy. Both ferrites are characterized by a modular structure composed of 5-layered spinel (S) blocks interstratified with R-blocks. The R-modules of K-ferrite are of the β-alumina type whereas those in Ba-ferrite are of the magnetoplumbite type. Rare grains of K-Ba-ferrite of intermediate composition with the empirical crystal chemical formula (EPMA): (KO:57BaO:38NaO:05)Σ1(Fe3+14.08Mg1:42AlO:80ZnO:59NiO:16CaO:14CuO:09MnO:03TiO:03SiO:02)Σ17:36O25:54, were also discovered. The structure of the natural mixed potassium-barium ferrite was investigated by single-crystal X-ray diffraction. The hexagonal space-group symmetry (P6m2, Z = 2) with a = 5.9137(2) and c = 33.1450(15)Å is different to that (P63/mmc) of the end-members and yields alternate stacking of β-alumina type KMg2Fe15O25 and magnetoplumbite type BaMg2Fe16O27 “supermodules”, each extending ½ of the unit cell along c. Raman spectroscopic study confirms the mixed character of K-Ba-ferrite structure. K-Baferrite formed at non-equilibrium conditions and may be interpreted as an example of a nano-dissipative structure.
First natural hexaferrite with mixed β'-ferrite (β-alumina) and magnetoplumbite structure from Jabel Harmun, Palestina
- Marco E. Ciriotti
- Messaggi: 31675
- Iscritto il: ven 25 giu, 2004 11:31
- Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
- Contatta:
First natural hexaferrite with mixed β'-ferrite (β-alumina) and magnetoplumbite structure from Jabel Harmun, Palestina
Marco E. Ciriotti
«Things are interesting only in so far as they relate themselves to other things»
«Things are interesting only in so far as they relate themselves to other things»
- Marco E. Ciriotti
- Messaggi: 31675
- Iscritto il: ven 25 giu, 2004 11:31
- Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
- Contatta:
First natural hexaferrite with mixed β'-ferrite and magnetoplumbite structure from Jabel Harmun, Palestina
Pubblicazione effettuata.
Referenza:
▪ Galuskin, E.V., Galuskina, I.O., Widmer, R., Armbruster, T. (2018): First natural hexaferrite with mixed β'-ferrite (β-alumina) and magnetoplumbite structure from Jabel Harmun, Palestinian Autonomy. European Journal of Mineralogy, 30, 559-567.
Abstract:
Ferrites of K and Ba close in composition to the known synthetic compounds KFe22+Fe153+O25 and BaMg2Fe163+O27 were found in a thin vein, filled with magnesioferrite and khesinite, in pyrometamorphic flamite–gehlenite hornfels of the Hatrurim Complex, Palestinian Autonomy. Both ferrites are characterized by a modular structure composed of 5-layered spinel (S) blocks interstratified with R-blocks. The R-modules of K-ferrite are of the β-alumina type whereas those in Ba-ferrite are of the magnetoplumbite type. Rare grains of K-Ba-ferrite of intermediate composition with the empirical crystal chemical formula (EPMA): (KO:57BaO:38NaO:05)Σ1(Fe3+14.08Mg1:42AlO:80ZnO:59NiO:16CaO:14CuO:09MnO:03TiO:03SiO:02)Σ17:36O25:54, were also discovered. The structure of the natural mixed potassium-barium ferrite was investigated by single-crystal X-ray diffraction. The hexagonal space-group symmetry (P6m2, Z = 2) with a = 5.9137(2) and c = 33.1450(15)Å is different to that (P63/mmc) of the end-members and yields alternate stacking of β-alumina type KMg2Fe15O25 and magnetoplumbite type BaMg2Fe16O27 “supermodules”, each extending ½ of the unit cell along c. Raman spectroscopic study confirms the mixed character of K-Ba-ferrite structure. K-Baferrite formed at non-equilibrium conditions and may be interpreted as an example of a nano-dissipative structure.
Referenza:
▪ Galuskin, E.V., Galuskina, I.O., Widmer, R., Armbruster, T. (2018): First natural hexaferrite with mixed β'-ferrite (β-alumina) and magnetoplumbite structure from Jabel Harmun, Palestinian Autonomy. European Journal of Mineralogy, 30, 559-567.
Abstract:
Ferrites of K and Ba close in composition to the known synthetic compounds KFe22+Fe153+O25 and BaMg2Fe163+O27 were found in a thin vein, filled with magnesioferrite and khesinite, in pyrometamorphic flamite–gehlenite hornfels of the Hatrurim Complex, Palestinian Autonomy. Both ferrites are characterized by a modular structure composed of 5-layered spinel (S) blocks interstratified with R-blocks. The R-modules of K-ferrite are of the β-alumina type whereas those in Ba-ferrite are of the magnetoplumbite type. Rare grains of K-Ba-ferrite of intermediate composition with the empirical crystal chemical formula (EPMA): (KO:57BaO:38NaO:05)Σ1(Fe3+14.08Mg1:42AlO:80ZnO:59NiO:16CaO:14CuO:09MnO:03TiO:03SiO:02)Σ17:36O25:54, were also discovered. The structure of the natural mixed potassium-barium ferrite was investigated by single-crystal X-ray diffraction. The hexagonal space-group symmetry (P6m2, Z = 2) with a = 5.9137(2) and c = 33.1450(15)Å is different to that (P63/mmc) of the end-members and yields alternate stacking of β-alumina type KMg2Fe15O25 and magnetoplumbite type BaMg2Fe16O27 “supermodules”, each extending ½ of the unit cell along c. Raman spectroscopic study confirms the mixed character of K-Ba-ferrite structure. K-Baferrite formed at non-equilibrium conditions and may be interpreted as an example of a nano-dissipative structure.
Marco E. Ciriotti
«Things are interesting only in so far as they relate themselves to other things»
«Things are interesting only in so far as they relate themselves to other things»
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