New large grain, highly crystalline, transparent glass-ceramics
New large grain, highly crystalline, transparent glass-ceramics
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DOI：
10.1016/j.jnoncrysol.2007.08.052
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发表时间：
2008-03-15
影响因子：
3.5
通讯作者：
Zanotto, Edgar D.
中科院分区：
文献类型：
--
作者：
Berthier, Thiana;Fokin, Vladimir M.;Zanotto, Edgar D.
某些微晶玻璃（TGC）在可见光区具有透明性的主要原因有两个：晶体尺寸远小于光波长或玻璃基质折射率与晶相折射率相差较小。大多数传统的TGC具有纳米尺寸的晶体和小到中等的结晶体积分数，通常在3%到70%之间。本文介绍了一种新型的透明微晶玻璃，它具有较大的晶粒尺寸和很高的晶化体积分数，晶化体积分数可达97%。它们的高透明度主要是由于在结晶过程中玻璃基质和晶体组成的同时变化，这大大降低了各自折射率之间的差异，并且无论晶体尺寸如何，这一因素都是普遍存在的。对它们的光学性质的初步测试表明，通过掺杂过渡金属和稀土，可以进一步发展这一新的TGC家族。(c)2007 Elsevier B.V.保留所有权利。
Two main reasons assure the transparency in the visible of some glass-ceramics (TGC): their crystal sizes are much smaller than the wavelength of light or the difference between the refractive index of glass matrix and crystal phase is small. The majority of traditional TGC have nano-size crystals and small to moderate crystallized volume fraction, usually between 3% and 70%. In this article we present a new type of transparent glass-ceramics having large (micrometric) grain size and very high crystallized volume fraction, which reaches up to 97%. Their high transparency mainly results from simultaneous variations of the glass matrix and crystal compositions during crystallization, which considerably decreases the difference between the respective refractive indexes, and this factor prevails, regardless of crystal size. Preliminary tests of their optical properties indicate that this new family of TGC can be further developed by doping with transition metals and rare-earths. (c) 2007 Elsevier B.V. All rights reserved.