“…We have tried low temperature in rich oxygen chamber, at 200-280°C [23]. We mostly anneal our ferroelectric samples in atmospheric chamber, at various temperatures from 350 to 950°C [5,20,24,28,32,33]. We also have varied the holding duration from 1 to 29 h [3, 7-9, 11, 17, 18, 20, 27, 29, 30, 34, 35].…”