Local Structures of Solid Solutions Sr1–xYxF2+x (x = 0...0.5) with Fluorite Structure Prepared by Sol–Gel and Mechanochemical Syntheses

详细信息    查看全文

• 作者：Benjamin Ritter ; Thoralf Krahl ; Gudrun Scholz ; Erhard Kemnitz
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：April 28, 2016
• 年：2016
• 卷：120
• 期：16
• 页码：8992-8999
• 全文大小：590K
• 年卷期：0
• ISSN：1932-7455

文摘

Nanocrystalline Sr_1–xY_xF_2+x samples (0 ≤ x ≤ 0.50) were prepared by fluorolytic sol–gel and mechanochemical syntheses using anhydrous HF or NH₄F as fluorinating agents. This way, we compare the generated nanoparticular nonstoichiometric phases synthesized by two different routes. The obtained nonstoichiometric fluorite-type phases were studied using ¹⁹F magic-angle spinning (MAS) and ¹⁹F–⁸⁹Y CP MAS NMR techniques and applying the superposition model. The ¹⁹F spectra of these phases can be fully explained by the distribution of Sr²⁺ and Y³⁺ cations around fluoride ions. These samples can serve as model compounds for a better structural understanding of fluorescent up- and down-converting systems.