Ferroelectricity Puns

Journal of the American Chemical SocietyDOI: 10.1021/jacs.0c12513

Yi Liu, Shiguo Han, Jiaqi Wang, Yu Ma, Wuqian Guo, Xiao-Ying Huang, Jun-Hua Luo, Maochun Hong, and Zhihua Sun

https://ift.tt/3a9oeSK

A solvent selective effect for the regulation of ferroelasticity and ferroelectricity of anilinium bromide is described, which is unprecedented in organic molecular ferroelectrics. Two forms of crystal structure were obtained from different crystallization solvents: ferroelastic AB‐1 and ferroelectric AB‐2. Atom key: Br (green), N (blue), H (light blue), C (gray).

Abstract

Organic ferroelectrics are highly desirable for their light weight, mechanical flexibility and biocompatibility. However, the rational design of organic ferroelectrics has always faced great challenges. Anilinium bromide (AB) has two structures reported in the Cambridge Crystallographic Data Centre, which might be an mmmF2/m type ferroelastic (AB‐1). When we studied its ferroelasticity, we were surprised to discover that there was another crystal (AB‐2) in H2O besides this one, and they were very difficult to separate. By changing the solvent, we found that AB‐1 crystals could be formed in ethanol, where ferroelastic domains were visualized by polarized light microscopy, and AB‐2 crystals could be obtained from various crystallization solvents of methanol, isopropanol, N‐butanol, acetonitrile, dimethyl sulfoxide, and N,N‐dimethylformamide, which undergo a ferroelectric phase transition with mm2Fm, showing clear ferroelectricity in two phases. To our knowledge, the regulation of ferroelasticity to ferroelectricity by solvent selective effect is unprecedented in the field of ferroelectrics. This work reveals the important role of solvent effect in organic ferroelectrics.

https://ift.tt/397Rqdu

Hey guys,

I recently made a website for my grandpa who was head of research at CNRS in France. He worked a lot on Solid State Chemistry and especially on ferroelectricity. His papers are from ~1970 to ~2010. If you need information and/or papers related to this field, you have around 450 publications to review on there.

Sorry for the website's style it might be a bit ugly, and it is in french, but I plan to re-design it and add english translation. If you have any suggestions do not hesitate !

Thank you and I hope this will help some

here is the website : https://jeanravez.fr

Polarization‐sensitive ultraviolet (UV) photodetection is highly indispensable in military and civilian applications and has been demonstrated with various wide‐band photodetectors. However, it still remains elusive to achieve the self‐powered devices, which can be operated in the absence of external bias. Herein, for the first time, ferroelectricity‐driven self‐powered photodetection towards polarized UV light was successfully demonstrated in a 2D wide‐bandgap hybrid ferroelectric (BPA) 2 PbBr 4 (BPA = 3‐bromopropylammonium) ( 1 ). We found that the prominent spontaneous polarization in 1 results in a bulk photovoltaic effect (BPVE) of 0.85 V, that independently drives photoexcited carriers separation and transport and thus supports self‐powered ability. Emphatically, this self‐powered detector show a strong polarization‐sensitivity to the linearly polarized UV illumination with an impressive polarization ratio up to 6. 8, which is greatly superior to that of previously reported UV‐polarized photodetectors ( e.g. ZnO, GaN and GeS 2 ). As pioneering work, this work presents a paradigm for achieving self‐powered ultraviolet photodetection with strong polarization‐sensitivity by integrating ferroelectricity into hybrid halide perovskites.

https://ift.tt/3078BGn

URI:https://onlinelibrary.wiley.com/doi/abs/10.1002/aelm.202101189

Journal of the American Chemical SocietyDOI: 10.1021/jacs.1c09594

Jinxing Li, Runli Xia, Hao Xu, Jidan Yang, Xinxin Zhang, Junichi Kougo, Huanyu Lei, Shuqi Dai, Houbing Huang, Guangzu Zhang, Fangjie Cen, Yuanbin Jiang, Satoshi Aya, and Mingjun Huang

https://ift.tt/3lPBBOK