Solution combustion synthesis of Ca hexaferrite using glycine fuel

Abstract

Abstract Ca 1-X La X Fe 12 O 19 (x = 0 and 0.4) polycrystalline powders were synthesized by the solution combustion route using glycine as a fuel and nitrates as oxidizers. After the combustion reaction, the prepared powders were calcined at 1100 °C and 1200 °C in a static air atmosphere for 1 h. The thermo gravimetric (TG) study was carried out to understand the ignition temperature. The structural and morphological studies of the prepared hexaferrite powders were carried out by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. Magnetic properties of these samples were also measured by vibrating sample magnetometer (VSM). The XRD results of the samples which consisted of La as dopant and calcined at 1200 °C for 1 h, indicated the formation of calcium hexaferrite and also α-Fe 2 O 3 . However, the XRD results showed that CaFe 4 O 7 and α-Fe 2 O 3 phases were formed in the sample with the same condition but without using any dopant. The micrograph of SEM showed that the calcium hexaferrite particles were regular hexagonal platelets with the size range of 1–2 μm. Maximum magnetization (M Max ), remanent magnetization (M r ), and coercivity (H c ) were measured from the hysteresis loops. Low values of coercive field (23.52 kA m −1 ) and maximum magnetization (58.75 Am 2 kg −1 ) were originated from calcium hexaferrite particle which calcined at the temperature of 1200 °C for 1 h.