Effect of microstructures on dielectric breakdown strength of sintered reaction‐bonded silicon nitride ceramics. - Nakashima, Yuki; Zhou, You; Tanabe, Keisuke; Arima, Souhei; Hirao, Kiyoshi; Ohji, Tatsuki; Murayama, Norimitsu; Fukushima, Manabu (Journal of the American Ceramic Society, 2023)