Na2CaV4O12: A low-temperature-firing dielectric with lightweight, low relative permittivity, and dielectric anomaly around 515 C

A low temperature fired Na2CaV4O12 ceramic was synthesized via a solid-state reaction route at range of 350–550 °C. The Thermal analysis confirmed the densification and melting to be 530 °C 580 °C, respectively. Dielectric properties together with electrical conductivity were characterized broad frequency range. super-low relative permittivity εr = 7.72 loss tangent tanδ 0.06 obtained 1 MHz room temperature. dielectric anomaly peak took place around 515 which associated phase transition from P4/nbm P 4‾ b2. Ac impedance spectrum coupled complex modulus plots unveiled conduction mechanism, dominated by short-range movement charge carriers temperatures (T ≤ 220 °C) however long-range migration emerged higher temperatures.