Investigation on Discharge Behavior of Antiferroelectric Multilayer Ceramic Capacitors

The most promising capacitors for pulse power applications are thought to be antiferroelectric (AFE) ones. Owing to the impact of hysteresis, it is critical to comprehend the discharge behavior of the AFE capacitors under pulse conditions. In this work, multilayer ceramic capacitors (MLCCs) made of lead lanthanum zirconate titanate were manufactured using the laminate co-firing method, and the discharge characteristics were examined. The material displayed a high recoverable energy density of 12.4
$\text {J}\cdot \text {cm}^{-{3}}$
with the efficiency
$\eta $
of 90% at 68
$\text {V}\cdot \mu \text {m}^{\vphantom {\text {D}^{l}}-{1}}$
. The discharge current waveforms obeyed the theoretical formulas controlled by field-dependent capacitance. Moreover, in pulse discharge conditions, the capacitor outputted less energy, which was
$11.9\,\,\text {J}\cdot \text {cm}^{\vphantom {\text {D}^{l}}-{3}}$
in the
$\textit {RC}$
circuit and
$11.8\,\,\text {J}\cdot \text {cm}^{-{3}}$
in the
$\textit {RLC}$
circuit. The extra energy loss was mainly derived from the frequency-dependent viscous loss of dipoles, which resulted in discharge degradation and eventually failure. Finally, by the weak point breakdown theory and the electric tree model, the failure point produced under the pulse condition could be explained.