The Na_2Ta_2O_6 would keep the special claviform strucfure at pH=13.The clave were made of cubic particles after hydrothermal treating at pH=9.however,the stncctive of clara would be demdished and transform into irregular purtides at pH=7.

• 当pH=13时Na2Ta2O6样品仍保持特殊的棒状结构.；pH=9时；则棒完全由立方小颗粒组成