Scholarlink

<p>Hybrid materials have attracted increasing interest among chemists and materials scientists due to their promising applications across diverse fields. Among them, organic–inorganic hybrids incorporating mixed halides have garnered particular attention in recent years, owing to their exceptional structural diversity. In this context, we deemed it appropriate to synthesize and characterize a new hybrid material based on zinc and mixed halides. Crystallographic studies identified an orthorhombic structure, classified within the non-centrosymmetric space group <i>P</i>2<sub>1</sub>2<sub>1</sub>2<sub>1</sub>. The structural framework comprises anionic [ZnBr<sub>2.25</sub>Cl<sub>1.75</sub>]<sup>2</sup>⁻&#xa0;tetrahedral units coupled with protonated piperazine (C<sub>4</sub>H<sub>12</sub>N<sub>2</sub>)<sup>2</sup>⁺ cations, interconnected through hydrogen bonding. Thermal stability was assessed via thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC), revealing that (C<sub>4</sub>H<sub>12</sub>N<sub>2</sub>)[ZnBr<sub>2.25</sub>Cl<sub>1.75</sub>] remains intact up to nearly 300&#xa0;°C before decomposing in two stages, ultimately forming zinc oxide (ZnO) as the final product. Optical absorption measurements in the UV–Vis range demonstrated that charge transfer transitions dominate, rather than internal d-d transitions. The material exhibits a bandgap energy of 5.14&#xa0;eV, positioning it at the threshold between semiconductor and insulating behavior. The investigation of its electrical and dielectric characteristics was primarily conducted through complex impedance spectroscopy (CIS). Findings indicated that the electrical response varies significantly with frequency and temperature. An equivalent circuit model was devised to elucidate the observed impedance patterns. The temperature-dependent alternating conductivity of this polycrystalline material adheres to Jonscher’s power law. Additionally, the relatively low activation energy suggests the simultaneous presence of both electronic and ionic conduction. Importantly, (C<sub>4</sub>H<sub>12</sub>N<sub>2</sub>)[ZnBr<sub>2.25</sub>Cl<sub>1.75</sub>] exhibits a high dielectric constant, making it a promising candidate for applications in energy harvesting technologies.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Dielectric and electrical characteristics of a zinc-based hybrid mixed halide material for energy harvesting applications

  • 期刊论文

  • 发表日期：

    2025年8月24日

查看全文
  • Soumaya Sidaoaui,
  • Naoufel Ben Hamadi,
  • Raja Jlassi,
  • Abderrazek Oueslati,
  • Mihai Raduca,
  • Marius Andruh,
  • Ahlem Guesmi,
  • Wesam Abd El-Fattah,
  • Walid Rekik,
  • Houcine Naïli

摘要

Hybrid materials have attracted increasing interest among chemists and materials scientists due to their promising applications across diverse fields. Among them, organic–inorganic hybrids incorporating mixed halides have garnered particular attention in recent years, owing to their exceptional structural diversity. In this context, we deemed it appropriate to synthesize and characterize a new hybrid material based on zinc and mixed halides. Crystallographic studies identified an orthorhombic structure, classified within the non-centrosymmetric space group P212121. The structural framework comprises anionic [ZnBr2.25Cl1.75]2⁻ tetrahedral units coupled with protonated piperazine (C4H12N2)2⁺ cations, interconnected through hydrogen bonding. Thermal stability was assessed via thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC), revealing that (C4H12N2)[ZnBr2.25Cl1.75] remains intact up to nearly 300 °C before decomposing in two stages, ultimately forming zinc oxide (ZnO) as the final product. Optical absorption measurements in the UV–Vis range demonstrated that charge transfer transitions dominate, rather than internal d-d transitions. The material exhibits a bandgap energy of 5.14 eV, positioning it at the threshold between semiconductor and insulating behavior. The investigation of its electrical and dielectric characteristics was primarily conducted through complex impedance spectroscopy (CIS). Findings indicated that the electrical response varies significantly with frequency and temperature. An equivalent circuit model was devised to elucidate the observed impedance patterns. The temperature-dependent alternating conductivity of this polycrystalline material adheres to Jonscher’s power law. Additionally, the relatively low activation energy suggests the simultaneous presence of both electronic and ionic conduction. Importantly, (C4H12N2)[ZnBr2.25Cl1.75] exhibits a high dielectric constant, making it a promising candidate for applications in energy harvesting technologies.