Formation of Sol–Gel In Situ Derived BTO/NZFO Composite Ceramics with Considerable Dielectric and Magnetic Properties

Abstract

The BT/NZFO composite ceramics derived by sol–gel in situ process were successfully prepared. The phase composition, morphology, and microstructure of the composite ceramics were determined and observed by X‐ray diffractometer (XRD), SEM, and EDS. Results showed that the Ni–Zn ferrite (NZFO) phase started to grow initially and then the BaTiO3 (BTO) phase grew among the interfaces of NZFO particles at high ferrite content. The observation of microstructure showed that the NZFO phase in large grain size is enwrapped by the BTO phase in small grain size, and the constituent phases existed in the form of solid solutions doped with Fe and Ti, respectively. The densification and microstructure depended on the volume fraction of ferrite (fNZFO). The appropriate sintering temperature was 1280°C–1300°C at which stable phase structure could be obtained for the BTO/NZFO composite. The maximum permittivity could achieve 86 000, and the initial permeability was as high as 162 when the ceramics was loaded with 95% ferrite and sintered at 1300°C for 12 h. The BT/NZFO composite ceramics exhibited impressive dielectric and magnetic properties, making it a potential candidate for wide applications in the integration of electronic devices.

The Giant Dielectric Constant and High Initial Permeability of BaTiO3-Ni0.5Zn0.5Fe2O4Composite Ceramics

“…By contrast, the NZF phase is dominant on spot B accompanying with a small amount of BTO phase, which is well consistent with the composition of the sample 0. respectively. 1,10,11 The influence of the applied alternating electric field frequency and NZF ferrite content on tanδ of the composite ceramics can be observed in the insets of Fig. When the frequency is bigger than 100 KHz, the dielectric constant of each sample remains constant of 750 for 0.8BTO-0.2NZF, 160 for 0.5BTO-0.5NZF and 39,000 for 0.2BTO-0.8NZF at high frequencies, respectively.…”

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] With excellent dielectric and ferromagnetic properties, multiferroic BaTiO 3 -Ni 1-x Zn x Fe 2 O 4 may have a promising potential application in capacitors, memory devices, power systems and automotive industry, etc., but a tremendous difference about its values of relative dielectric constant was found for the great diversities of preparation process. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] With excellent dielectric and ferromagnetic properties, multiferroic BaTiO 3 -Ni 1-x Zn x Fe 2 O 4 may have a promising potential application in capacitors, memory devices, power systems and automotive industry, etc., but a tremendous difference about its values of relative dielectric constant was found for the great diversities of preparation process.…”

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] With excellent dielectric and ferromagnetic properties, multiferroic BaTiO 3 -Ni 1-x Zn x Fe 2 O 4 may have a promising potential application in capacitors, memory devices, power systems and automotive industry, etc., but a tremendous difference about its values of relative dielectric constant was found for the great diversities of preparation process. 1 A giant dielectric constant (240,000) of BaTiO 3 -Ni 0.5 Zn 0.5 Fe 2 O 4 composite ceramics by ceramic process was reported at room temperature by Yang et al 3 To the best of our knowledge, the value of 240,000 is the highest dielectric constant reported in the similar dielectric-ferromagnetic composite systems up to now. 1 A giant dielectric constant (240,000) of BaTiO 3 -Ni 0.5 Zn 0.5 Fe 2 O 4 composite ceramics by ceramic process was reported at room temperature by Yang et al 3 To the best of our knowledge, the value of 240,000 is the highest dielectric constant reported in the similar dielectric-ferromagnetic composite systems up to now.…”

Azimuthally Controlled Magnetic and Dielectric Properties of Multiferroic Nanocrystalline Composite by Magnetic Coupling and Charge Hopping

“…It is worth noting that BTO/NZFO is a typical multiferroic composite system with good dielectric and magnetic properties. [12][13][14]23,24 Single-crystal silicon is a chemically stable substrate without interacting with the targeted thin films even as high temperature and adjusts expectedly the growth orientation of magnetic phase in the composite thin film. 25,26 RF Magnetron sputtering is a physical vapor deposition (PVD) method used extensively in commercial process.…”

Multi-susceptibile Single-Phased Ceramics with Both Considerable Magnetic and Dielectric Properties by Selectively Doping

“…To contribute multi susceptibilities such as magnetic and dielectric properties simultaneously, percolative ceramic composites composed of ferroelectric and ferromagnetic phases have been extensively studied in recent decades123456. The percolative composites are impressive to contribute both extraordinary dielectric and magnetic performances, because the paradox caused by composite law is solved78.…”