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Published on: March 24, 2019
A breakthrough in the intrinsic multiferroic temperature region in Prussian blue analogues
Qingrong Kong1, Ruixuan Qin1, Dong Li1
1Collaborative Innovation Center of Chemistry for Energy Materials, State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University Xiamen 361005 China lslong@xmu.edu.cn hxzhao@xmu.edu.cn.
Abstract:
Thin films of [(FeII CrII 1- )]1.5[CrIII(CN)6]·yH2O (x ≈ 0.30-0.35, y ≈ 1.77) (1) on FTO substrates (namely film 1) were synthesized with an electrochemical method. Investigation of the ferroelectricity of film 1 at different temperatures reveals that it exhibits ferroelectric behaviour in the temperature range from 10 K to 310 K. Study of the X-ray absorption (XAS) of the crushed film 1 and simulation of the structure of film 1 and crushed film 1 by using the Materials Studio software indicate that the vacancy defects and interactions between the film and FTO substrate make a key contribution to the ferroelectricity of film 1. Owing to the magnetic phase transition point being up to 210 K, film 1 is a multiferroic material and its magneto/electric coexistence temperature can be as high as 210 K.
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