Effect of Barium on the Properties of Lead Hexaferrite

Modification of the Magnetic Properties of Co₂Y Hexaferrites by Divalent and Trivalent Metal Substitutions

“…The physical properties were modified by the substitution of Ba ions and/or Fe ions by other metal ions. Specifically, Ba ions in these ferrites were substituted by Sr [8,70,71], Pb [72][73][74], and Ca [21,[75][76][77]. On the other hand, the effects of a large variety of substitutions for Fe ions on the structural and physical properties of hexaferrites were reported.…”

Effect of pb on the magnetic interactions of the M-type hexaferrites

“…Prior to sintering, the powders were mixed in a stoichiometric ratio with an excess of 33% of lead oxide and pressed into pellets. The added excess of lead oxide was previously calculated to obtain the pure phases, due that lead is lost during the sintering at high temperature, in this sense, the heat-treatment temperature was kept constant at 1200°C for samples (a) and (b), at 1250°C for sample (c) and at 950°C for sample (d) [11][12][13], all samples were calcined during two hours.…”

“…When Sr and Ba hexaferrites are prepared under the same conditions, their crystalline structures and morphologies remain without important changes [7][8][9][10][11][12][13], however, when Pb is present in the hexaferrite, the variations in their magnetic properties are remarkable. Previous works highlight that Pb-hexaferrite has less coercivity and remanence than Ba or Sr hexaferrites.…”

Magneto-Structural Characterization of Strontium Substituted Lead Hexaferrite

“…In the first stage of the preparation, the powders were weighed according to the stoichiometric chemical reaction; the powders were mixed in ethylic alcohol for one hour in a rotary mill at 90 rpm; later, the powders were dried at 50 • C, and presintered at 800 • C for one hour; at the second stage of the preparation, the lead, lost during the heat treatment by evaporation, was compensated by adding lead oxide; this amount is constant (33.9%) for all compositions [17], the excess of lead oxide was mixed in ethylic alcohol with the presintered powders for one hour. The resultant powders were compacted applying an axial load of 2.5 T/cm 2 on cylindrical samples of 4.8 mm in diameter.…”