Structural, microstructural and magnetic properties of sol–gel-synthesized novel BaZrO3–CoFe2O4 nanocomposite

Abstract

A novel 0.5(BaZrO 3)-0.5(CoFe 2 O 4) (BZ-CF) nanocomposite ceramics has been synthesized using sol-gel autocombustion and mixing technique. The structural analysis was carried out using X-ray diffraction (XRD) technique. The XRD pattern shows mixed perovskite and spinel ferrite phases with simple cubic structure for the BZ-CF nanocomposite. The calculated average crystallite size of the samples varies of the order of the nanoregime. The lattice parameter (a) and other structural parameter were obtained using XRD data and it is found that the structural data of pure parent ceramics were in the reported range. The surface morphology of grains of the present samples was examined using field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). The FESEM images show spherical particles with average grain size in the nanometer range. Compositional stoichiometry was confirmed by energy dispersive spectrum (EDX) analysis. Fourier-transform infrared spectra (FTIR) of barium zirconate (BZ) and cobalt ferrite (CF) confirmed the perovskite and spinel ferrite structure, respectively. However, the FTIR spectrum of BZ-CF nanocomposite confirmed the change in crystal structure due to mixed phases. The M-H curves recorded at room temperature using pulse field hysteresis loop tracer technique exhibits a weak hysteresis loop for BZ-CF nanocomposite, perfectly diamagnetic nature for BZ nanoceramics, and typical ferromagnetic hysteresis loop for pure CF nanoceramics.

Structural, Optical and Magnetic Properties of Diamagnetic Cd2+ Incorporated Cobalt Ferrite Thin Films Deposited by Spray Pyrolysis

“…The lattice parameter of the nanoferrite thin films is determined by employing interplanar spacing and Miller indices corresponding to each peak of the XRD patterns. 54 The lattice parameters were found to be between 8.386 Å and 8.466 Å with the upsurge of Cd 2+ content x. The variation of lattice parameter with Cd 2+ content x is shown in Fig.…”

Sol–gel auto-ignition fabrication of Gd3+ incorporated Ni0.5Co0.5Fe2O4 multifunctional spinel ferrite nanocrystals and its impact on structural, optical and magnetic properties

“…The lattice constant (a) of the Gd 3+ doped Ni-Co ferrites were determined by means of the typical relation and their values are organized in Table 1 [49], where d is interplanar distance; (hkl) is Miller Indices. Figure 4 illustrates the distinction of lattice constant (a) with Gd 3+ concentration y.…”

Influence of Zirconium (Zr4+) Substitution on the Crystal Structure and Optical and Dielectric Properties of Sr0.8Mg0.2(Sn1–xZrx)O3 Ceramics

“…18−23 In addition, with the rapid development of wireless communication and the huge amount of information discovery since the start of the 21 st century, there are new and higher requirements for microwave dielectric ceramics. 5,8,11 The focus of academic attention has shifted more and more toward investigating the upper limit of dielectric properties and looking for new low-loss candidates to meet emerging requirements. Based on this, we previously systematically investigated the synthesis of Sr ties (ε r = 63, Q × f = 84,000 GHz, and τ f = 293 ppm/°C).…”

“…Hydrothermal syntheses with microwave assistance method have also been carried out for several compositions . Microwave dielectric ceramics with right relative permittivity (ε r ), high quality factor ( Q × f ) values, and approximately zero temperature coefficient of resonant frequency have been extensively studied over the past few decades because they are essential components for microwave substrates, resonators, oscillators, and so on. − In addition, with the rapid development of wireless communication and the huge amount of information discovery since the start of the 21 st century, there are new and higher requirements for microwave dielectric ceramics. ,, The focus of academic attention has shifted more and more toward investigating the upper limit of dielectric properties and looking for new low-loss candidates to meet emerging requirements. Based on this, we previously systematically investigated the synthesis of Sr 3 Ti 2 O 7 bulk ceramics and obtained excellent microwave dielectric properties (ε r = 63, Q × f = 84,000 GHz, and τ f = 293 ppm/°C) .…”

“…Semiconductor sensors (for humidity and gases), energy storage, and barrier layer capacitors have been reported as applications of stannates. − Stannate synthesis routes are especially interesting because of their importance. Stannates have already been successfully synthesized using a variety of techniques, i.e., high-temperature solid-state reactions of M­(NO 3 ) 2 /SnO 2 or MCO 3 /SnO 2 powder mixtures at different temperatures, i.e., 1000–1450 °C. − In addition to these ceramic preparation methods, those stannates can also be made by using sol–gel processes or by thermally decomposing oxalates . However, the temperatures needed for these two alternate methods are 800 or 1000 °C, respectively.…”