Abstract
Using mixtures of A, B, or X site ions in piezoelectric hybrid organic inorganic materials has been shown to be an effective strategy to improve piezoelectric properties. Here, we investigated the effect of increasing Br content within histammonium tetrachlorozincate [HistNH3Zn(ClxBr1-x)4] by varying the relative amounts of Cl and Br from x = 0% to 100% on nonlinear optical and piezoelectric properties. We found that the crystal structures were unchanged with Br percentages up to 100%, but the melting point of the materials changed substantially with increasing Br content. On the other hand, the nonlinear optical properties were only moderately affected with increasing Br content. The piezoelectric response of each material was measured and compared with DFT calculated values, both of which agreed that the overall the materials had relatively similar d33 coefficients. The x = 75% Br compound had the largest magnitude d33 value at maximum strain at both 29 °C (−97.56 pm/V) and 40 °C (−92.00 pm/V). The observed negative piezoelectric response is a rare trait that was ascribed to the large number of intermolecular interactions between lattice elements, as described by others.
| Original language | English |
|---|---|
| Pages (from-to) | 11411-11422 |
| Number of pages | 12 |
| Journal | ACS Applied Energy Materials |
| Volume | 7 |
| Issue number | 24 |
| DOIs | |
| State | Published - Dec 23 2024 |
Funding
A.H. acknowledges startup funds from the University of Kentucky. This material is based upon work supported by the National Science Foundation under Cooperative Agreement No. 1849213. Part of SHG measurements were supported by the Center for Nanophase Materials Sciences (CNMS), which is a U.S. Department of Energy, Office of Science, User Facility at Oak Ridge National Laboratory. Other parts of SHG measurements were performed at University of Kentucky, with acknowledgement of funding from the Office of Vice President for Research (OVPR). This work was performed in part at the U.K. Electron Microscopy Center, a member of the National Nanotechnology Coordinated Infrastructure (NNCI), which is supported by the National Science Foundation (NNCI-2025075). This publication was supported by the University of Kentucky Materials Science Research Priority Area. C.S. acknowledges funds from the University of South Carolina and AFOSR (20IOE044).
Keywords
- halide mixing
- hybrid materials
- low symmetry materials
- noncentrosymmetric materials
- nonlinear optics
- piezoelectrics