Regulation of the order–disorder phase transition in a Cs2NaFeCl6 double perovskite towards reversible thermochromic application. (July 2021)

• Record Type: Journal Article
• Authors: Li, Wenzhe; Rahman, Naveed Ur; Xian, Yeming; Yin, Hang; Bao, Yunkai; Long, Yi; Yuan, Songyang; Zhang, Yangyi; Yuan, Yaxuan; Fan, Jiandong
• Is Part Of: Journal of semiconductors. Volume 42:Number 7(2021)
• Publication Date: 2021-07
• Subjects: lead-free perovskite -- Cs2NaFeCl6 single crystal -- thermochromism -- crystallographic structure -- order-disorder phase transition; Semiconductors -- Periodicals; 621.38152
• DOI: 10.1088/1674-4926/42/7/072202
• Languages: English
• ISSNs: 1674-4926

Abstract

Abstract: Multifunctional lead-free double perovskites demonstrate remarkable potential towards applications in various fields. Herein, an environmentally-friendly, low-cost, high-throughput Cs2 NaFeCl6 single crystal with exceedingly high thermal stability is designed and grown. It obtains a cubic lattice system in the temperature range of 80–500 K, accompanied by a completely 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 including (i) the noteworthy distortion/deformation of [NaCl6 ] 5− and [FeCl6 ] 3− octahedra; (ii) order–disorder arrangement transition 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 Cs2 NaFeCl6 perovskite.