Regulation of the order-disorder phase transition in a Cs2NaFeCl6 double perovskite towards reversible thermochromic application

• 作者: Wenzhe Li Naveed Ur Rahman Yeming Xian Hang Yin Yunkai Bao Yi Long Songyang Yuan Yangyi Zhang Yaxuan Yuan Jiandong Fan
• 来源期刊: 半导体学报（英文版）
• 年，卷（期）: 2021,（7）
• 所属期刊栏目: ARTICLES
• 页码范围: 37-45
• 页数: 9页
• 语种: 英文
• DOI: 10.1088/1674-4926/42/7/072202

摘要

Multifunctional lead-free double perovskites demonstrate remarkable potential towards applications in various fields.Herein,an environmentally-friendly,low-cost,high-throughput Cs2NaFeCl6 single crystal with exceedingly high thermal stabil-ity is designed and grown.It obtains a cubic lattice system in the temperature range of 80-500 K,accompanied by a com-pletely reversible chromatic variation ranging from yellow to black.Importantly,the intriguing thermochromism is proved to own extremely high reproducibility (over 1000 cycles) without a hysteretic effect,originating from its structural flexibility that in-cluding (i) the noteworthy distortion/deformation of[NaCl6]5-and[FeCl6]3-octahedra;(ii) order-disorder arrangement trans-ition of[NaCl6]5-and[FeCl6]3-octahedra as the function of temperature.This study paves the way towards a new class of smart windows and camouflage coatings with an unprecedented colour range based on a Cs2NaFeCl6 perovskite.