Notably, the vast diference in sint

Notably, the vast diference in sintering temperatures between ceramics and polymers poses a severe challenge when combining core–shell-structured ceramics with polymer matrixes via a suitable sintering method [21–23].This is due to the sintering temperature has a signifcant efect on the core–shell-structured ceramics. The high sintering temperature is conducive to the interdifusion of the ions in the shell and the crystal nucleus, thereby reducing the size of the core layer and possibly leading to the collapse of the core–shell structure [24]. In addition, the organic shell of the core–shell structure is unstable at high temperatures. Therefore, it is essential to choose a suitable sintering system to retain the core–shell structure during the sintering process of composites. The cold sintering process (CSP) has been recently developed to obtain dense ceramics at low temperatures (~200℃) [25–30]; the CSP provides an alternative way to prepare ceramics-polymer composites.