A breakthrough in the intrinsic multiferroic temperature region in Prussian blue analogues. Issue 71 (17th December 2019) - Kong, Qingrong
Abstract : Prussian blue analogue film exhibits ferroelectric from 10 to 310 K and works up to 210 K as a molecular-based multiferroic material. Abstract : Thin films of [(FeII x CrII1− x )]1.5 [Cr III (CN)6 ]· y H2 O ( 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.