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We show how a simple bilayer system that combines a layer of undoped BaTiO (BT) with a second layer of BaNaTiNbO (2.5NNBT) can be used to improve the temperature coefficient of capacitance (TCC) of BaTiO-based materials for capacitor applications. The bilayer system emulates the volume ratio between a conventional core and shell phase microstructure allowing a simple resource efficient approach to optimise the system for low TCC. Optimisation was achieved with a volume ratio of 0.67 2.5NNBT with 0.33 BT and results in a TCC of ±6% over the temperature range ∼25 to 125 °C whilst maintaining a permittivity of ε ∼ 3000 and low dielectric loss.


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