Riello Pietro, Bucella Stefania, Krsmanoviĉ Radenka, Meneghetti Stefano, Pietrantoni Serena, Francini Roberto
Dipartimento di Chimica Fisica, Università di Venezia Ca' Foscari, Via Torino 155b, 30170 Venezia-Mestre, Italy.
J Phys Chem B. 2005 Jul 21;109(28):13424-30. doi: 10.1021/jp050919a.
Low thermal expansion Li(2)O-Al(2)O(3)-SiO(2) (LAS) glass ceramic was examined as a host matrix for erbium ions. ZrO(2) was added to the glass since it serves as a nucleating agent and as a good environment for the luminescent ions. The study was carried out on amorphous powders of the Li(2)O-Al(2)O(3)-SiO(2)/ZrO(2)/Er(2)O(3) system prepared by the sol-gel method and successively crystallized at different temperatures. X-ray diffraction (XRD), transmission electron microscopy (TEM), and infrared (IR) spectroscopy were employed to study the evolution of the crystalline phases and the distribution of the erbium ions. The TEM micrographs confirmed that, after thermal treatment at 1000 degrees C, the crystallization of nanoparticles constituted by an Er(2)O(3)-ZrO(2) solid solution with narrow size distribution could be achieved. On the contrary, erbium silicate was detected in the samples without ZrO(2). The repartition constant of Er(2)O(3) between ZrO(2) and LAS matrix has been also evaluated.
研究了低热膨胀Li₂O-Al₂O₃-SiO₂（LAS）玻璃陶瓷作为铒离子主体基质的情况。向玻璃中添加了ZrO₂，因为它可作为成核剂并为发光离子提供良好的环境。该研究针对通过溶胶-凝胶法制备并在不同温度下依次结晶的Li₂O-Al₂O₃-SiO₂/ZrO₂/Er₂O₃体系的非晶粉末展开。采用X射线衍射（XRD）、透射电子显微镜（TEM）和红外（IR）光谱来研究晶相的演变以及铒离子的分布。TEM显微照片证实，在1000℃热处理后，可实现由尺寸分布窄的Er₂O₃-ZrO₂固溶体构成的纳米颗粒的结晶。相反，在不含ZrO₂的样品中检测到了硅酸铒。还评估了Er₂O₃在ZrO₂和LAS基质之间的分配常数。
