Molten hydroxide synthesis as an alternative to molten salt synthesis for producing K0.5Na0.5NbO3 lead free ceramics
Molten hydroxide synthesis as an alternative to molten salt synthesis for producing K0.5Na0.5NbO3 lead free ceramics
复制标题
DOI：
10.1007/s10853-011-5984-8
复制
发表时间：
2012-02
影响因子：
4.5
通讯作者：
T. Lusiola;Francesca Bortolani-;Qi Zhang;R. Dorey
中科院分区：
文献类型：
--
作者：
T. Lusiola;Francesca Bortolani-;Qi Zhang;R. Dorey
无铅压电材料的重要性随着环境问题的增加以及随后的欧盟和全球立法而增加，希望减少所有部门中含铅材料的使用。将下一代无铅压电材料与基板集成以形成功能性微型器件的研究较少。针对K0.5Na0.5NbO3（KNN）粉体在高温烧结过程中纯度不高的问题，开发了低温合成K0.5Na0.5NbO3（KNN）粉体的方法。熔融氢氧化物合成（MHS），来自熔盐合成（MSS），已被开发，以克服在熔盐合成反应中的Na离子偏好，导致NaNbO 3的生产，而不是KNN时，使用化学计量的前体。MHS使用KOH熔融反应助剂代替MSS的NaCl/KCl熔融盐混合物。在两阶段反应中，产生富含K的中间体碳酸盐，随后与Na物质反应产生KNN。
Lead-free piezoelectric materials have grown in importance through increased environmental concern and subsequent EU and worldwide legislation, with the aspiration to reduce the use of Pb-based materials in all sectors. Integration of the next generation of lead-free piezoelectric materials with substrates to form functional micro devices has received less attention. Low temperature synthesis methods for K0.5Na0.5NbO3(KNN) powder were developed to overcome the issue of poor purity of the final product during high temperature sintering. Molten hydroxide synthesis (MHS), derived from molten salt synthesis (MSS), has been developed to overcome a Na ion preference in the molten salt synthesis reaction that leads to NaNbO3production instead of KNN when stoichiometric amounts of precursors are used. MHS makes use of a KOH molten reaction aid in place of the NaCl/KCl molten salt mix of the MSS. In a two stage reaction K rich intermediate niobates are produced and subsequent reactions with Na species produce KNN.