Affiliation:
1. School of Materials Science and Engineering Shandong University of Technology Zibo Shandong People's Republic of China
2. Department of Mathematics Zibo Normal College Zibo Shandong People's Republic of China
3. Analytical Testing Center Shandong University of Technology Zibo Shandong People's Republic of China
4. Hubei Key Laboratory of Micro‐Nanoelectronic Materials and Devices Hubei University Wuhan China
5. School of Materials Science and Engineering Tongji University Shanghai Shanghai People's Republic of China
Abstract
AbstractA series of new x(yNiO/zAl2O3)‐(1–x)Ba0.5Sr0.5TiO3 (x = 10, 30, and 50 wt.%, y = 1, 1.3, 1.5, z = 1, 1.3, and 1.5 mol) ceramics were prepared using the solid‐phase method. The effects of the spinel oxides on the microstructure, lattice vibrations, and dielectric properties of Ba0.5Sr0.5TiO3 were assessed. When NiO and Al2O3 were present in equal quantities, they reacted to form NiAl2O4. Under the recombination effect, the dielectric permittivity of Ba0.5Sr0.5TiO3 was effectively reduced, the Curie temperature (Tc) was increased, and tunability gradually increased. The Tc value was not significantly altered when NiO was in excess. Impurity phases were generated, and the Tc value decreased when Al2O3 was in excess. This study elucidated the unique role of the spinel structure. The 50 wt.%(NiO/Al2O3)‐50 wt.%Ba0.5Sr0.5TiO3 had excellent microwave dielectric properties, with dielectric permittivity, tunability, and Q values of 300, 18.7%, and 357, respectively.