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Magnetic and Structural Properties of Barium Hexaferrite BaFe12O19 from Various Growth Techniques.

ABSTRACT: Barium hexaferrite powder samples with grains in the ?m-range were obtained from solid-state sintering, and crystals with sizes up to 5 mm grown from PbO, Na?CO?, and BaB?O? fluxes, respectively. Carbonate and borate fluxes provide the largest and structurally best crystals at significantly lower growth temperatures of 1533 K compared to flux-free synthesis (1623 K). The maximum synthesis temperature can be further reduced by the application of PbO-containing fluxes (down to 1223 K upon use of 80 at % PbO), however, Pb-substituted crystals Ba1-xPbxFe12O19 with Pb contents in the range of 0.23(2) ? x ? 0.80(2) form, depending on growth temperature and flux PbO content. The degree of Pb-substitution has only a minor influence on unit cell and magnetic parameters, although the values for Curie temperature, saturation magnetization, as well as the coercivity of these samples are significantly reduced in comparison with those from samples obtained from the other fluxes. Due to the lowest level of impurities, the samples from carbonate flux show superior quality compared to materials obtained using other methods.

SUBMITTER: Vinnik DA 

PROVIDER: S-EPMC5552085 | biostudies-other | 2017 May

REPOSITORIES: biostudies-other

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Magnetic and Structural Properties of Barium Hexaferrite BaFe<sub>12</sub>O<sub>19</sub> from Various Growth Techniques.

Vinnik Denis A DA   Tarasova Aleksandra Yu AY   Zherebtsov Dmitry A DA   Gudkova Svetlana A SA   Galimov Damir M DM   Zhivulin Vladimir E VE   Trofimov Evgeny A EA   Nemrava Sandra S   Perov Nikolai S NS   Isaenko Ludmila I LI   Niewa Rainer R  

Materials (Basel, Switzerland) 20170525 6

Barium hexaferrite powder samples with grains in the μm-range were obtained from solid-state sintering, and crystals with sizes up to 5 mm grown from PbO, Na₂CO₃, and BaB₂O₄ fluxes, respectively. Carbonate and borate fluxes provide the largest and structurally best crystals at significantly lower growth temperatures of 1533 K compared to flux-free synthesis (1623 K). The maximum synthesis temperature can be further reduced by the application of PbO-containing fluxes (down to 1223 K upon use of 8  ...[more]