The sintering process and mechanism of (K, Na, Li) (Nb, Ta, Sb)O3 (KNLNTS) solid solution were investigated. The results show that the KNLNTS forms via the reaction of A2CO3(A: K,Na,Li) and B2O5(B: Nb,Ta,Sb) at 400–800 °C. The kinetics for the formation of KNLNTS during solid-state reaction is investigated using an isothermal method. Based on the reaction kinetic isothermal analysis, KNLNTS formation is corroborated as being controlled by diffusion mechanism. It has been found that sintering densification occurs within a narrow temperature range, and the density decreases apparently when the sintering temperature slightly exceeds the optimal one. Abnormal grain growth tends to occur after reaching the maximum density and get intensified with increasing temperature. The effect of sintering temperature and time on the shrinkage of powder compacts during sintering were studied. The sintering process in the KNLNTS solid solutions may be explained by the grain boundary diffusion model inferring from the shrinkage rate of about 0.3.
展开▼
机译：研究了（K，Na，Li）（Nb，Ta，Sb）O 3 （KNLNTS）固溶体的烧结过程及机理。结果表明，KNLNTS是通过A 2 CO 3 （A：K，Na，Li）和B 2 O < sub> 5 （B：Nb，Ta，Sb）在400–800°C下。使用等温方法研究了固态反应过程中形成KNLNTS的动力学。根据反应动力学等温分析，证实了KNLNTS的形成受扩散机理的控制。已经发现，烧结致密化发生在狭窄的温度范围内，并且当烧结温度稍微超过最佳温度时密度明显降低。达到最大密度后，往往会发生异常的晶粒长大，并随着温度的升高而加剧。研究了烧结温度和时间对粉末压块收缩率的影响。 KNLNTS固溶体中的烧结过程可以通过晶界扩散模型来解释，该模型由约0.3的收缩率推断得出。
展开▼
