Wen Shaofei, Wang Yunpeng, Lan Bijiao, Zhang Weida, Shi Zhuo, Lv Shichao, Zhao Yujun, Qiu Jianrong, Zhou Shifeng
State Key Laboratory of Luminescent Materials and Devices School of Materials Science and Engineering South China University of Technology Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques Guangdong Engineering Technology Research and Development Censter of Special Optical Fiber Materials and Devices Guangzhou 510640 China.
Department of Physics South China University of Technology Guangzhou 510640 China.
Adv Sci (Weinh). 2019 Jun 28;6(17):1901096. doi: 10.1002/advs.201901096. eCollection 2019 Sep 4.
Transparent nanoceramics embedded with highly dense crystalline domains are promising for applications in missile guidance, infrared night vision, and laser and nuclear radiation detection. Unfortunately, current nanoceramics are strictly constrained by the stringent construction procedures such as super-high pressure and containerless processing. Here, a pressureless crystallization engineering strategy in glass for elaboration of transparent nanoceramics and fibers is proposed and experimentally demonstrated. By intentional creation of a sharp contrast between nucleation and growth rates, the crystal growth rate during glass crystallization can be significantly suppressed. Importantly, this unique phase-transition habit enables the achievement of transparent nanoceramics and even smooth fibers with extremely tiny crystalline size (≈20 nm) and high crystallinity (≈97%) under atmospheric pressure. This allows the generation of an attractive nonlinear optical response such as dynamic optical filtering and luminescence in the mid-infrared waveband of 4300-4950 nm. These findings highlight that the strategy to switch the phase-transition habit of glass into the unconventional crystallization regime may provide new opportunities for the creation of next-generation nanoceramics and fibers.
嵌入高密度晶域的透明纳米陶瓷在导弹制导、红外夜视以及激光与核辐射探测等领域具有广阔的应用前景。不幸的是，目前的纳米陶瓷受到诸如超高压和无容器加工等严格制造工艺的严格限制。在此，我们提出并通过实验证明了一种用于制备透明纳米陶瓷和纤维的玻璃无压结晶工程策略。通过有意在成核速率和生长速率之间制造显著差异，可以显著抑制玻璃结晶过程中的晶体生长速率。重要的是，这种独特的相变习性能够在大气压下实现具有极小晶体尺寸（约20纳米）和高结晶度（约97%）的透明纳米陶瓷甚至光滑纤维。这使得在4300 - 4950纳米的中红外波段产生诸如动态光学滤波和发光等引人注目的非线性光学响应成为可能。这些发现突出表明，将玻璃的相变习性转变为非常规结晶状态的策略可能为创造下一代纳米陶瓷和纤维提供新的机遇。
