The manufacture and characterisation of aligned fibres of the ferroxplana ferrites Co2Z, 0.67% CaO-doped Co2Z, Co2Y and Co2W

Preparation and characterization of Z-type hexaferrites, Ba3(1−x)Sr3x Co2Fe24O41 with x = 0–0.5, via a two-step calcination with an intermediate wet milling

“…Among various chemical synthesis techniques, citrate precursors [5] and sol-gel method [6,7] have been proven to be effective in reducing the sintering temperature and achieving desirable properties.…”

Performance of radar absorbing nanocomposites by waveguide measurements

“…The magnetization curves of the product synthesized in this work show typical features of magnetically soft materials and we can observe a decreasing coercive force (H c ) and the remanent magnetization (B r ) when calcination temperature is increased, a behavior consistent with the disappearance of the M-type phase and increasing Z-type phase 6,[7][8][9][10][11][12] . The powder calcined at 900 °C does not also presented magnetic saturation, which was only achieved in the product from calcination at 950 °C during 4 hours (magnetization of 45.1 emu/g and a coercive force of 110 Oe).…”

“…However, this material synthesized in inert atmosphere contains according to Pullar et al 11 small undetectable amounts of Y-type phase (Ba 2 Co 2 Fe 12 O 22 ) coexisting with the Z-type phase.…”

Co2Z hexaferrite obtained by the citrate precursor method in an inert atmosphere

“…Therefore, the use of an inert atmosphere effectively reduces the temperature required to form Ztype hexaferrite, a behavior remarkably unlike that which the same starting mixture undergoes when synthesized in air (instead of inert atmosphere), in which case the calcined product consisted of: (a) a mixture of Y and M-types at 1000 o C; (b) Z-type phase peaks were evident only at 1150 o C [8]. However, according to Pullar et al [9,10] To evaluate the microstructure of the compact material, disc-shaped compacts (1.5 cm diameter and 0.5 cm height), obtained by dry pressing the powder, were analyzed by scanning electron microscopy (the samples were mounted on aluminum supports and coated with a film of gold).…”