A new family of high temperature stability and ultra-fast charge–discharge KNN-based lead-free ceramics
Source abstract
Abstract
Dielectric ceramic capacitors have been widely used in pulse-power technology because of their good performance of high power density and fast discharge speed. A series of lead-free relaxor ceramics (1-x)K0.5Na0.5NbO3-xLa(Mn0.5Ni0.5)O3 (KNN-xLMN) featuring with considerable charge–discharge behavior and energy storage properties were designed and prepared in this work. The grain size of ceramics decreases to 180 ± 20 nm, and the dispersion coefficient is > 1.6, both of which are beneficial to obtain slender P-E loops and improve the energy storage performance in K0.5Na0.5NbO3 ceramics upon La(Mn0.5Ni0.5)O3 doping. Consequently, acceptable dielectric properties (maximum permittivity εr of 1693, Δε/ε100 °C ≤ ± 15% from 33 °C to 309 °C, minimum dielectric loss tan δ of 0.028, 50 kHz) and a high recoverable energy storage density (Wrec ~ 1.65 J/cm3) accompanied by high energy storage efficiency (η ~ 76%) were obtained simultaneously in 0.97KNN-0.03LMN ceramics. Meanwhile, 0.97KNN-0.03LMN composition exhibited satisfactory charge–discharge performance (PD ~ 155 MW/cm3, t0.9 ~ 55 ns) and temperature stability (30 ~ 110 °C). This work not only proposes an efficient strategy to realize high energy storage and ultra-fast charge–discharge performance in lead-free KNN based ceramics, but also provide an candidate material for application of advanced pulsed power capacitors.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Ferroelectric and Piezoelectric Materials · Dielectric materials and actuators · Microwave Dielectric Ceramics Synthesis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (46)
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