• The novel tetragonal barium titanate with crystal druse and dendrite are prepared.
•The concentration and adding time of mineralizer (KOH) played an important role in the morphology of BaTiO3.
•The as-prepared BaTiO3 crystal druse and dendrite possess the high tetragonality;
•The different properties induce the two particles have different electric responses: the higher the tetragonality is, the greater the dielectric property is, and the stronger the electric-field response is.
The tetragonal barium titanate (BaTiO3) particles with novel shapes were synthesized by a surfactant-free hydrothermal method and fully characterized by Raman, XRD, SEM and contact angle analysis. The shape of particles are dependent on reaction temperature, pH value and mineralization time. The tetragonal BaTiO3 particles with different morphology possess different tetragonality, surface hydrophilicity and dielectric property, and so they exhibit distinct electric-field response. The high tetragonality and good dielectric property of the particles are proposed as a main power of enhancing the electric response of tetragonal BaTiO3 dispersed in hydrous elastomer.