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Magnetic and structural properties of barium hexaferrite BaFe12O19 from various growth techniques. / Vinnik, Denis A.; Tarasova, Aleksandra Yu; Zherebtsov, Dmitry A. et al.
In: Materials, Vol. 10, No. 6, 578, 25.05.2017.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Magnetic and structural properties of barium hexaferrite BaFe12O19 from various growth techniques
AU - Vinnik, Denis A.
AU - Tarasova, Aleksandra Yu
AU - Zherebtsov, Dmitry A.
AU - Gudkova, Svetlana A.
AU - Galimov, Damir M.
AU - Zhivulin, Vladimir E.
AU - Trofimov, Evgeny A.
AU - Nemrava, Sandra
AU - Perov, Nikolai S.
AU - Isaenko, Ludmila I.
AU - Niewa, Rainer
PY - 2017/5/25
Y1 - 2017/5/25
N2 - 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 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.
AB - 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 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.
KW - Crystal growth
KW - Crystal structure
KW - Inorganic compounds
KW - Magnetic properties
KW - Magneticmaterials
KW - SHIELDING EFFECTIVENESS
KW - CRYSTAL-STRUCTURE
KW - FERRITE
KW - WIDE BANDWIDTH
KW - REFINEMENT
KW - POWDERS
KW - SINGLE-CRYSTALS
KW - ABSORBER
KW - MICROWAVE-ABSORPTION
KW - magnetic properties
KW - inorganic compounds
KW - magnetic materials
KW - crystal structure
KW - crystal growth
UR - http://www.scopus.com/inward/record.url?scp=85029778726&partnerID=8YFLogxK
U2 - 10.3390/ma10060578
DO - 10.3390/ma10060578
M3 - Article
C2 - 28772940
AN - SCOPUS:85029778726
VL - 10
JO - Materials
JF - Materials
SN - 1996-1944
IS - 6
M1 - 578
ER -
ID: 9910011