Several Important Concepts: @铁电相变：phase transition of ferroelectrics @铁电相与顺电(paraelectricity)相之间的转变 @居里温度（居里点）T。铁电体(ferroelectric) 变成顺电体(paraelectric) @实质：自发极化出现或消失 (a) a-c domain wall ⊙c 4000 0.4 0.1 001 10 3000 100 0.3 1000kH2z a-c DW 【100] 2000 0.2 ⊙ [010] (b) a-a domain wall 1000 0.1 1.10,100kHz 0 e之O -100-50 0 50100150200 ⊙ Temperature [C] ⑧c 图 2023/6/28 c2023/6/28 13 Several Important Concepts: @铁电相变：phase transition of ferroelectrics @铁电相与顺电(paraelectricity)相之间的转变 @居里温度（居里点） Tc 铁电体(ferroelectric) 变成顺电体(paraelectric) @实质 ：自发极化出现或消失