Structural, magnetic and microstructural study of Sr2Ni2Fe12O22

Temperature dependent structural and magnetic behavior of Y-type hexagonal ferrites synthesized by sol–gel autocombustion

“…The lattice parameters (a and c) and volume of unit cell (V) for single phase sample were calculated by the following relations respectively [15,16] are very close to the reported values for Y-type hexagonal ferrites [14,17].…”

“…In addition, as temperature was increased up to 1100°C, the intensity of M-type peaks decreased. A Y-type hexaferrite as a major phase was obtained at a temperature of 1200 0 C due to the inter-reaction of M-type hexaferrites (SrFe 12 O 19 ) and monoferrite (SrFe 2 O 4 ) [9,14]. All the peaks for the sample were indexed, compared with standard JCPDS card 82-0472 and it reveals that major phase of Y-type hexagonal ferrite can be achieved at a temperature of 1200°C.…”

Influence of rare-earth ions on the structure and magnetic properties of barium W-type hexaferrite

“…They are subdivided into six fundamental, simplest structural types: M, W, Y, X, Z and U [1,2]. The structure of these different types of hexagonal ferrites is very complex and can be considered as a superposition of T, R and S blocks along the hexagonal c-axis, such as RSTSR*S*T*S* for Z-type, RSSR*S*S* for W-type, and RSR*S* for M-type, where T is a block of four layers of oxygen ions (O 4 -BaO 3 -BaO 3 -O 4 ) with composition Ba 2 Fe 8 O 14 , R is a three-oxygen-layer block (O 4 -BaO 3 -O 4 ) with composition BaFe 6 O 11 , S (spinel block) is a twooxygen-layer block (O 4 -O 4 ) with composition Fe 6 O 8 , and the asterisk means that the corresponding block has been turned 1801 around the hexagonal axis [3].…”

Microwave-assisted catalytic decomposition of N2O over hexaferrites

“…The temperature of the catalyst bed in the microwave field was measured by IR thermometer and a thermocouple, both of which have been confirmed to be comparatively precise methods [16,17]. [18]. By the introduction of Al the intense reflection of BaAl 2 O 4 was observed along with hexaferrite phase (MP type and Y type).…”