The article presents for the first time the synthesis of a (K,Na,Li)(Nb,Ta)O3 solid solution from a mechanochemically activated powder. The method allows the preparation of a homogeneous solid solution with dielectric and piezoelectric properties comparable to the properties obtained by the conventional solid-state synthesis route, where much larger number of processing steps is required.
COBISS.SI-ID: 22179879
The paper presents for the first time a detailed mechanism of the mechanochemical reaction between K2CO3 and Nb2O5. The study is based on milling experiments designed to drive the studied reaction at different ball-impact energies and ball-impact frequencies. The reaction mechanism is characterized by the formation of an amorphous carbonato complex, which decomposes after prolonged milling at high ball-impact energies, giving rise to the formation of KNbO3 and other niobate phases with molar ratio K/Nb < 1.
COBISS.SI-ID: 22806823
The work deals with the mechanism of mechanochemical activation and its role in the synthesis of (K,Na,Li)(Nb,Ta)O3 (KNLNT) solid solution. Special attention was given to the influence of the milling regime on the course of activation. The results showed that during activation of the initial powder mixture a carbonato complex is formed, in which the carbonate ions are coordinated to Nb and Ta. We showed that the formation of the complex during activation is crucial to obtain highly homogeneous KNLNT ceramics, which is otherwise difficult to be achieved by the conventional synthesis method.
COBISS.SI-ID: 23538727