Engineering Elastic Properties of Isostructural Molecular Perovskite Ferroelectrics via B‐Site Substitution

An, Lian-Cai; Li, Kai; Li, Zhigang; Zhu, Shengli; Li, Qite; Zhang, Zhuo-Zhen; Li-jun, JI; Li, Wei; Bu, Xian‐He

doi:10.1002/smll.202006021

Cited by 21 publications

(20 citation statements)

References 45 publications

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“…Young's modulus (E) characterizes the ability of a material to resist uniaxial stress. [37] The E max of (BTMA) 2 CoBr 4 is 17.56 GPa along the <−101> direction while the E min is 4.11 GPa along the <101> direction as shown in Figure 2a. Such different values of Young's moduli can be rationalized by analyzing the crystal structure.…”

Section: Elastic and Piezoelectric Propertiesmentioning

confidence: 93%

A New Hybrid Lead‐Free Metal Halide Piezoelectric for Energy Harvesting and Human Motion Sensing

Guo

Gong

et al. 2021

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voltage power sources, and energy harvesting systems. [1][2][3][4][5][6][7] The commercially available piezoelectrics are dominated by conventional ceramics (i.e., lead zirconate titanate, PZT) and polymers (i.e., polyvinylidene difluoride, PVDF). For the former, they often require harsh synthetic conditions and contain toxic heavy metals; while for the later, their piezoelectric performance still needs further improvement. In this regard, developing new kind of piezoelectric materials to overcome these drawbacks is highly thought after. Recently, hybrid organicinorganic piezoelectric materials have attracted extensive attention due to their great structural tunability, mild synthesis conditions, mechanical flexibility, low dielectric constants, and attractive piezoelectric performance. [8][9][10] For instance, an extremely high d 33 of about 1540 pC N −1 was realized in a molecular perovskite solid solution (TMFM) x (TMCM) 1− x -CdCl 3 (TMFM = trimethylfluoromethyl ammonium, TMCM = trimethylchloromethyl ammonium). [11] A following study shows that a 2D perovskite (ATHP) 2 PbBr 4 [12] (ATHP, 4-aminotetrahydropyran) can exhibit a g 33 as large as 660.3 × 10 −3 V m N −1 . These values are even much higher than those of many commercial piezoelectric materials, such as PZT-5H [13] (d 33 = 593 pC N −1 ) and PVDF (g 33 = 286.7 × 10 −3 V m N −1 ). Many of these hybrid piezoelectric materials, however, have the perovskite-type structures which mean that their organic amines (A-site), metal cations (B-site), and halides (X-sites) are limited by the tolerance factors. On the other hand, these hybrid compounds often contain lead or other toxic metals, [10] which inevitably restricting their future applications in eco-friendly environments. Hence, it is of great significance to explore lead-free molecular piezoelectric systems. Some important progresses have been recently made in synthesizing hybrid lead-free organic-inorganic perovskites, and typical examples are TMCM-MnCl 3 (d 33 = 185 pC N −1 , Mn = Manganese), [14] (RM3HQ) 2 RbLa(NO 3 )

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Section: Elastic and Piezoelectric Propertiesmentioning

confidence: 93%

A New Hybrid Lead‐Free Metal Halide Piezoelectric for Energy Harvesting and Human Motion Sensing

Guo

Gong

et al. 2021

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“…The discovery of a new subset of hybrid organic–inorganic perovskites 1 e based on the A-site MDABCO dication (MDABCO = N -methyl- N ′-diazabicyclo[2.2.2]octonium) has led to renewed interest in hybrid inorganic–organic FE materials, owing to their properties that are comparable to BaTiO 3 . 2 Variation in the B and X sites has given rise to four MDABCO-based halide perovskites to date: [MDABCO]RbI 3 , 2 a [MDABCO]NH 4 I 3 , 2 b [MDABCO]KI 3 (ref. 2 c ) and [MDABCO]NH 4 Br 3 .…”

Section: Introductionmentioning

confidence: 99%

Materials discovery and design limits in MDABCO perovskites

et al. 2022

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“…Plastic molecular crystals exhibiting switchable polarization are a unique class of ferroelectric (FE) materials owing to their environmental friendliness, structural tunability, and mechanical flexibility [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 ]. Compared to inorganic FE materials, the low-temperature processibility of plastic crystals makes it an attractive choice for FE applications [ 9 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 ]. The major drawback of molecular ferroelectric crystals are their low spontaneous polarization, low melting temperature, low Curie temperature, and small dielectric constant, which needs to be improved for replacing it with the inorganic FE materials [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

Stabilization of Ferroelectric Phase in Highly Oriented Quinuclidinium Perrhenate (HQReO4) Thin Films

Lee¹,

Seol²,

Anoop³

et al. 2021

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The low-temperature processability of molecular ferroelectric (FE) crystals makes them a potential alternative for perovskite oxide-based ferroelectric thin films. Quinuclidinium perrhenate (HQReO4) is one such molecular FE crystal that exhibits ferroelectricity when crystallized in an intermediate temperature phase (ITP). However, bulk HQReO4 crystals exhibit ferroelectricity only for a narrow temperature window (22 K), above and below which the polar phase transforms to a non-FE phase. The FE phase or ITP of HQReO4 should be stabilized in a much wider temperature range for practical applications. Here, to stabilize the FE phase (ITP) in a wider temperature range, highly oriented thin films of HQReO4 were prepared using a simple solution process. A slow evaporation method was adapted for drying the HQReO4 thin films to control the morphology and the temperature window. The temperature window of the intermediate temperature FE phase was successfully widened up to 35 K by merely varying the film drying temperature between 333 and 353 K. The strategy of stabilizing the FE phase in a wider temperature range can be adapted to other molecular FE materials to realize flexible electronic devices.

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Engineering Elastic Properties of Isostructural Molecular Perovskite Ferroelectrics via B‐Site Substitution

Cited by 21 publications

References 45 publications

A New Hybrid Lead‐Free Metal Halide Piezoelectric for Energy Harvesting and Human Motion Sensing

A New Hybrid Lead‐Free Metal Halide Piezoelectric for Energy Harvesting and Human Motion Sensing

Materials discovery and design limits in MDABCO perovskites

Stabilization of Ferroelectric Phase in Highly Oriented Quinuclidinium Perrhenate (HQReO4) Thin Films

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