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The present work investigates microstructural, structural, ferroelectric and dielectric properties of Holmium, Ho 3+ , doped SrBi 4 Ti 4 O 15  (SBT). Polycrystalline ceramics (SrBi 4-x Ho x Ti 4 O 15  SBHT, where x = 0, 0.02. and 0.03) were prepared by solid-state reaction method using high energy planetary ball mill. The surface morphology of all samples displayed dense microstructure and average grain size decreased with Holmium content increase. The XRD results of samples confirmed a single phase of SBT with orthorhombic crystal structure and a reduction in unit cell volume with the substitution of Holmium at B-site. The improvement in the structural and microstructural properties greatly enhanced the electric properties of SBHT. SBHT (x = 0.02) sample showed the improved ferroelectric properties (remnant polarization  P r = 1.63 μC/cm 2  and Coercive field  E c = 0.51 kV/cm) making them suitable for ferroelectric applications. High Curie temperature (T C  = 626 °C), elevated dielectric constant (ε r  = 236) and low loss (tanδ = 0.062) are obtained with the substitution of Ho (for x = 0.03) at B- site of SBT. These ceramics have high  T Cand improved thermal stability which makes these apt for the applications in high temperature sensors.

Structural, microstructural, dielectric and ferroelectric properties of Ho 3+ doped SrBi 4 Ti 4 O 15 ceramics