Investigation of optical and transport properties of the semiconducting α-KYP2O7 compound

Autor: M. Ajili, M. Ben Gzaiel, Mohamed Gargouri, Abderrazek Oueslati
Rok vydání: 2021
Předmět:
Zdroj: Optical and Quantum Electronics. 53
ISSN: 1572-817X
0306-8919
DOI: 10.1007/s11082-021-02889-w
Popis: In this work, the ceramic compound α-KYP2O7 (α-KYP) was synthesized by a standard reaction in the solid-state, at high temperature. The morphology and structure of the sample were analyzed by scanning electron microscope and X-ray diffraction, respectively. The result of the X-ray diffraction revealed that all diffraction peak’s positions agree well with the reflection of an orthorhombic structure (Cmcm space group) without additional peaks. Regarding the differential scanning calorimetry, an irreversible phase transition located at T4 = 667 K (Heating) and three reversible phase transitions were observed at T1 = 490/463 K, T2 = 603/587 K, and T3 = 633/617 K (heating/cooling). The optical properties were studied by UV–Vis absorption spectroscopy. By looking directly at the UV absorption measurements and using the Tauc model, we found that the direct optical band gap is equal to 3.39 eV. In particular, the title compound also exhibits semiconductor and optical properties. The real and imaginary parts of the function of the impedance and conductivity have been studied over a wide range of temperatures and frequencies. From the Nyquist plots, we observe the existence of a grain and grain boundaries effect in the material. The obtained results were analyzed by fitting the experimental data to an equivalent circuit model. The angular frequency dependence of the conductivity was interpreted using the developed Jonscher relation. The conduction of the studied sample is ensured by K+ ions’ hopping in the tunnels and its mechanism was discussed. From these results, it can be concluded that this material can be used for different high temperature applications.
Databáze: OpenAIRE
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