It is shown that K (Ta, Nb)O_3 crystal exists in cubic phase when the content of Ta is higher than a certain value at room temperature and no phase transition occurs from growth temperature to room temperature.

• 发现含钽量大于一定量后,K(Ta,Nb)O_3晶体在室温下以立方相存在,在生长温度至室温间无相变。