Constructing phase boundary in AgNbO3 antiferroelectrics: pathway simultaneously achieving high energy density and efficiency

Abstract Dielectric capacitors with high energy storage density ( W rec ) and efficiency ( η ) are in great demand for high/pulsed power electronic systems, but the state-of-the-art lead-free dielectric materials are facing the challenge of increasing one parameter at the cost of the other. Herein, we report that high W rec of 6.3 J cm -3 with η of 90% can be simultaneously achieved by constructing a room temperature M2–M3 phase boundary in (1- x )AgNbO 3 - x AgTaO 3 solid solution system. The designed material exhibits high energy storage stability over a wide temperature range of 20–150 °C and excellent cycling reliability up to 10 6 cycles. All these merits achieved in the studied solid solution are…

• UO
  University of Sydney
• NN
  National Natural Science Foundation of China

  Awards: 51788104, 11864004, No. 51788104, Grant No. 51788104, AA17204100
• NS
  Natural Science Foundation of Guangxi Province

  Award: 2017GXNSFBA198132
• NS
  National Synchrotron Radiation Research Center
• AC
  Australian Centre for Microscopy and Microanalysis, University of Sydney
• AR
  Australian Research Council

  Awards: FT140100698, DP190101155
• SA
  Science and Technology Major Project of Guangxi

  Award: AA17204100