Abstract
Multilayer ceramic capacitors (MLCC) are widely used in consumer electronics. Here, we provide a transformative method for achieving high dielectric response and tunability over a wide temperature range through design of compositionally graded multilayer (CGML) architecture. Compositionally graded MLCCs were found to exhibit enhanced dielectric tunability (70%) along with small dielectric losses (<2.5%) over the required temperature ranges specified in the standard industrial classifications. The compositional grading resulted in generation of internal bias field which enhanced the tunability due to increased nonlinearity. The electric field tunability of MLCCs provides an important avenue for design of miniature filters and power converters.
Highlights
The temperature stability and electric field tunability of capacitance in multilayer ceramic capacitors (MLCCs) is highly desired to develop smaller and lighter power electronic devices
We report fabrication of functionally graded multilayer ceramic capacitors based on modified BaTiO3 based dielectric compositions
BCN) ceramics were selected for the compositionally graded multilayer ceramic capacitor because Curie temperature of this composition can be tuned by modulating Sn content while maintaining high permittivity and low loss in wide temperature range[32,37]
Summary
The temperature stability and electric field tunability of capacitance in multilayer ceramic capacitors (MLCCs) is highly desired to develop smaller and lighter power electronic devices. Miniaturization, and controlled capacitance tunability in ceramics provides opportunity to develop new MLCC architecture. Extensive theoretical studies on graded structures have predicted low loss, and high and temperature-stable dielectric constant[23,24,25]. Despite of interesting effect in the compositionally graded architecture, most of studies have been limited to thin film multilayer or hetero-structure not been applied in MLCCs. Previously, we have predicted enhanced temperature stability in dielectric response through compositionally graded multilayer (CGML) laminate architecture[32]. We report success in synthesizing and characterizing CGML ceramic capacitor structure with high dielectric constant over a wide temperature range and high tunability. The modeling and simulation provided relationship between microstructure and temperature stability of dielectric
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
