The ferroelectricity can be seen only after considering the interaction, but when the interaction is strong, the specific inductive capacity is high and the phase transition temperature is low which is detrimental to the stability of the ferroelectric phase. 只有考虑了相互作用之后才会出现铁电性,相互作用强的时候电容率高但是相变温度低,这对铁电相的稳定是有害的。