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Electrical energy storage properties of AgNbO3-based antiferroelectric ceramics prepared without an oxygen atmosphere by using hydrothermally synthesized powders

Abstract AgNbO3 based ceramics are commonly sintered with an O2 atmosphere. In this work, after synthesizing AgNbO3, Na-doped AgNbO3, and Ta-doped AgNbO3 powders by a hydrothermal method, the ceramics were sintered in the air atmosphere by using the synthesized powders. The novel process with the absence of an O2 atmosphere is practical and facile. The structural, dielectric, antiferroelectric, and electrical energy storage properties of fabricated ceramics were studied. Na doping has a weak influence on the structure but can significantly improve the electrical breakdown field. Ta doping induces a pure antiferroelectric phase and the electrical energy storage efficiency is improved greatly.