“…Thus, many studies have focused on enhancing the electrical and piezoelectric properties of BLSFs, such as control of preferred orientation [4], the effects of grain size [5], and A-site and/or B-site substitution [2,6,7]. In addition, there is a method for regulating the Bi 2 O 3 concentration, which can compensate structural defects (bismuth and oxygen vacancy complexes) due to bismuth volatilization that can occur in high-temperature heat treatment [8,9]. Furthermore, structural changes, such as changes in the grain size due to an increase in the Bi 2 O 3 concentration have been reported [1].…”