Effect of different defect dipoles on the polarization mechanism of Nb-doped SrTiO 3 single crystals

Key Points

• The study investigates how different oxygen-vacancy defect dipoles in Nb-doped SrTiO3 affect its polarization mechanisms.
• Examined various defect dipoles formed by doping and annealing
• Characterized the properties of SrNb 0.5% Ti 99.5% O 3
• Measured dielectric constant and loss at 1 kHz
• Oxygen-annealed SrNb 0.5% Ti 99.5% O 3 shows ε r = 63 217 and tan δ = 0.0208 at 1 kHz
• Increased defect dipoles lead to improved electron trapping and dielectric properties
• The findings guide the development of high-performance SrTiO3 dielectrics.