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[NH2CHNH2]3Sb2I9: a lead-free and low-toxicity organic–inorganic hybrid ferroelectric based on antimony(iii) as a potential semiconducting absorber

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Abstract

We report the physicochemical characteristics of a novel Sb-based formamidinium ferroelectric material, (NH2CHNH2)3Sb2I9 (FAIA). FAIA crystallizes at room temperature in the hexagonal P63mc space group. The crystal structure of FAIA is isomorphic to that of its bismuth analog, [NH2CHNH2]3Bi2I9 (FAIB), which is characterized by a zero dimensional (0D) anionic network (discrete bioctahedral units). From the DSC results three phase transitions (PT) have been found for FAIA: at 187.4/189 K (phase I ↔ phase II), 177.6/177.9 K (IIIII) and 148.2/152.3 K (IIIIV). The compound exhibits ferroelectricity in the room temperature phase I and in the successive temperature phases (II and III). The spontaneous polarization (PS = 0.5 × 10−2 μC cm−2) reversibility has been confirmed by the presence of the ferroelectric hysteresis loops and pyroelectric measurements. The origin of ferroelectricity is discussed in terms of the cationic dynamics. This material may be considered as a semiconductor (σ ∼ 10−6 S m−1, 300 K).

Graphical abstract: [NH2CHNH2]3Sb2I9: a lead-free and low-toxicity organic–inorganic hybrid ferroelectric based on antimony(iii) as a potential semiconducting absorber

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Article information


Submitted
06 Feb 2020
Accepted
19 Mar 2020
First published
20 Mar 2020

Inorg. Chem. Front., 2020, Advance Article
Article type
Research Article

[NH2CHNH2]3Sb2I9: a lead-free and low-toxicity organic–inorganic hybrid ferroelectric based on antimony(III) as a potential semiconducting absorber

P. Szklarz, R. Jakubas, A. Gągor, G. Bator, J. Cichos and M. Karbowiak, Inorg. Chem. Front., 2020, Advance Article , DOI: 10.1039/D0QI00137F

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