Revealing the hydrothermal crystallization mechanism of ilmenite-type sodium niobate microplates: the roles of potassium ions,CrystEngComm

当前位置： X-MOL 学术 › CrystEngComm › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Revealing the hydrothermal crystallization mechanism of ilmenite-type sodium niobate microplates: the roles of potassium ions
CrystEngComm ( IF 2.6 ) Pub Date : 2017-08-25 00:00:00 , DOI: 10.1039/c7ce01171g
Qilin Gu _{1,

2,

3,

4,

5} , Wanheng Lu _{6,

7,

8,

9} , Qiaomei Sun _{6,

7,

8,

9} , Kongjun Zhu _{1,

2,

3,

4,

5} , Jing Wang _{1,

2,

3,

4,

5} , Jinsong Liu _{1,

2,

3,

4,

5} , Jianhui Zhang _{5,

10,

11,

12} , Kaiyang Zeng _{6,

7,

8,

9} , John Wang _{7,

8,

9,

13}

Affiliation

In this study, ilmenite-type NaNbO₃ microplates were prepared by a facile surfactant-free method, using NaAc and KOH as a sodium resource and as a mineralizer, respectively. The effects of each reactant were identified, and the formation process and crystallization pathway of ilmenite-type NaNbO₃ microplates were explored based on the phase constitution, microstructure and chemical compositional analysis. The indispensable roles of K ions, which participated in the formation of layered KNN-hydrate intermediates, were revealed. Ilmenite-type NaNbO₃ microplates were formed by the dissolution of these intermediates and subsequent recrystallization into K-containing NaNbO₃, followed by the ion-exchange between K and Na ions. Meanwhile excess K ions would hinder the release of K ions associated with the dissolution of intermediates, thus preventing the formation of ilmenite-type NaNbO₃. Moreover, the morphological evolution of ilmenite-type NaNbO₃ microplates from platelets to octahedra was interpreted in terms of their intrinsic structure and KOH concentration.

中文翻译：

揭示钛铁矿型铌酸钠微孔板的水热结晶机理：钾离子的作用

在这项研究中，钛铁矿型NaNbO ₃微孔板是通过一种简便的无表面活性剂方法制备的，分别使用NaAc和KOH作为钠源和矿化剂。确定了每种反应物的作用，并根据相组成，微观结构和化学组成分析，探讨了钛铁矿型NaNbO ₃微孔板的形成过程和结晶途径。揭示了参与层状KNN水合物中间体形成过程中的K离子必不可少的作用。通过溶解这些中间体并随后重结晶成含K的NaNbO ₃形成钛铁矿型NaNbO ₃微孔板，然后进行K和Na离子之间的离子交换。同时，过量的K离子会阻碍与中间体溶解相关的K离子的释放，从而阻止钛铁矿型NaNbO ₃的形成。此外，钛铁矿型NaNbO ₃微孔板从血小板到八面体的形貌演化根据其固有结构和KOH浓度进行了解释。

更新日期：2017-09-14

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11