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[en] In this study, strontium titanate bicrystals with a twist grain boundary were successfully formed using a spark plasma sintering apparatus. Diffusion bonding was accomplished at high pressure and fast heating, and provides a novel method to form bicrystals at lower temperatures and accelerated time scales compared to more established techniques. Scanning electron microscopy was used to quantitatively evaluate the degree of successful interfacial bonding. Atomic resolution imaging using transmission election microscopy techniques combined with spatially resolved electron energy-loss spectroscopy measurements confirm a clean and atomically abrupt interface free of secondary phases.