Effect of Sintering Temperature and Polarization on the Dielectric and Electrical Properties of La<sub>0.9</sub>Sr<sub>0.1</sub>MnO<sub>3</sub> Manganite in Alternating Current
The electrical characterization ofa La<sub>0.9</sub>Sr<sub>0.1</sub>MnO<sub>3</sub> compound sintered at 800, 1000 and 1200 °C was investigated by means of the impedance-spectroscopy technique. As the results, the experimental conductivity spectra were explained i...
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| author | Wided Hizi Malek Gassoumi Hedi Rahmouni Ahlem Guesmi Naoufel Ben Hamadi Essebti Dhahri |
| author_facet | Wided Hizi Malek Gassoumi Hedi Rahmouni Ahlem Guesmi Naoufel Ben Hamadi Essebti Dhahri |
| author_sort | Wided Hizi |
| collection | DOAJ |
| description | The electrical characterization ofa La<sub>0.9</sub>Sr<sub>0.1</sub>MnO<sub>3</sub> compound sintered at 800, 1000 and 1200 °C was investigated by means of the impedance-spectroscopy technique. As the results, the experimental conductivity spectra were explained in terms of the power law. The AC-conductivity study reveals the contributions of different conduction mechanisms. Indeed, the variation in the frequency exponents (‘s<sub>1</sub>’ and ‘s<sub>2</sub>’) as a function of the temperature confirms the thermal activation of the conduction process in the system. It proves, equally, that the transport properties are governed by the non-small-polaron-tunneling and the correlated-barrier-hopping mechanisms. Moreover, the values of the frequency exponents increase under the sintering-temperature (TS) effect. Such an evolution may be explained energetically. The jump relaxation model was used to explain the electrical conductivity in the dispersive region, as well as the frequency-exponent values by ionic conductivity. Under electrical polarization with applied DC biases of Vp = 0.1 and 2 V at room temperature, the results show the significant enhancement of the electrical conductivity. In addition, the dielectric study reveals the evident presence of dielectric relaxation. Under the sintering-temperature effect, the dielectric constant increases enormously. Indeed, the temperature dependence of the dielectric constant is well fitted by the modified Curie–Weiss law. Thus, the deduced values of the parameter (γ) confirm the relaxor character and prove the diffuse phase transition of our material. Of note is the high dielectric-permittivity magnitude, which indicates that the material is promising for microelectronic devices. |
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| spelling | doaj.art-ee67992304e14540bc05a763d1a752682023-11-23T11:59:02ZengMDPI AGMaterials1996-19442022-05-011510368310.3390/ma15103683Effect of Sintering Temperature and Polarization on the Dielectric and Electrical Properties of La<sub>0.9</sub>Sr<sub>0.1</sub>MnO<sub>3</sub> Manganite in Alternating CurrentWided Hizi0Malek Gassoumi1Hedi Rahmouni2Ahlem Guesmi3Naoufel Ben Hamadi4Essebti Dhahri5Unité de Recherche MatériauxAvancés et Nanotechnologies (URMAN), Université de Kairouan, ISSAT, Kasserine 1200, TunisiaUnité de Recherche MatériauxAvancés et Nanotechnologies (URMAN), Université de Kairouan, ISSAT, Kasserine 1200, TunisiaUnité de Recherche MatériauxAvancés et Nanotechnologies (URMAN), Université de Kairouan, ISSAT, Kasserine 1200, TunisiaChemistry Department, College of Science, IMSIU (Imam Mohammad Ibn Saud Islamic University), Riyadh 11623, Saudi ArabiaChemistry Department, College of Science, IMSIU (Imam Mohammad Ibn Saud Islamic University), Riyadh 11623, Saudi ArabiaLaboratoirede Physique Appliquée, Faculté des Sciences, Université de Sfax, Sfax 3000, TunisiaThe electrical characterization ofa La<sub>0.9</sub>Sr<sub>0.1</sub>MnO<sub>3</sub> compound sintered at 800, 1000 and 1200 °C was investigated by means of the impedance-spectroscopy technique. As the results, the experimental conductivity spectra were explained in terms of the power law. The AC-conductivity study reveals the contributions of different conduction mechanisms. Indeed, the variation in the frequency exponents (‘s<sub>1</sub>’ and ‘s<sub>2</sub>’) as a function of the temperature confirms the thermal activation of the conduction process in the system. It proves, equally, that the transport properties are governed by the non-small-polaron-tunneling and the correlated-barrier-hopping mechanisms. Moreover, the values of the frequency exponents increase under the sintering-temperature (TS) effect. Such an evolution may be explained energetically. The jump relaxation model was used to explain the electrical conductivity in the dispersive region, as well as the frequency-exponent values by ionic conductivity. Under electrical polarization with applied DC biases of Vp = 0.1 and 2 V at room temperature, the results show the significant enhancement of the electrical conductivity. In addition, the dielectric study reveals the evident presence of dielectric relaxation. Under the sintering-temperature effect, the dielectric constant increases enormously. Indeed, the temperature dependence of the dielectric constant is well fitted by the modified Curie–Weiss law. Thus, the deduced values of the parameter (γ) confirm the relaxor character and prove the diffuse phase transition of our material. Of note is the high dielectric-permittivity magnitude, which indicates that the material is promising for microelectronic devices.https://www.mdpi.com/1996-1944/15/10/3683La<sub>0.9</sub>Sr<sub>0.1</sub>MnO<sub>3</sub>sintering temperatureelectrical conductivityhoppingtunnelingpolarization and dielectric properties |
| spellingShingle | Wided Hizi Malek Gassoumi Hedi Rahmouni Ahlem Guesmi Naoufel Ben Hamadi Essebti Dhahri Effect of Sintering Temperature and Polarization on the Dielectric and Electrical Properties of La<sub>0.9</sub>Sr<sub>0.1</sub>MnO<sub>3</sub> Manganite in Alternating Current Materials La<sub>0.9</sub>Sr<sub>0.1</sub>MnO<sub>3</sub> sintering temperature electrical conductivity hopping tunneling polarization and dielectric properties |
| title | Effect of Sintering Temperature and Polarization on the Dielectric and Electrical Properties of La<sub>0.9</sub>Sr<sub>0.1</sub>MnO<sub>3</sub> Manganite in Alternating Current |
| title_full | Effect of Sintering Temperature and Polarization on the Dielectric and Electrical Properties of La<sub>0.9</sub>Sr<sub>0.1</sub>MnO<sub>3</sub> Manganite in Alternating Current |
| title_fullStr | Effect of Sintering Temperature and Polarization on the Dielectric and Electrical Properties of La<sub>0.9</sub>Sr<sub>0.1</sub>MnO<sub>3</sub> Manganite in Alternating Current |
| title_full_unstemmed | Effect of Sintering Temperature and Polarization on the Dielectric and Electrical Properties of La<sub>0.9</sub>Sr<sub>0.1</sub>MnO<sub>3</sub> Manganite in Alternating Current |
| title_short | Effect of Sintering Temperature and Polarization on the Dielectric and Electrical Properties of La<sub>0.9</sub>Sr<sub>0.1</sub>MnO<sub>3</sub> Manganite in Alternating Current |
| title_sort | effect of sintering temperature and polarization on the dielectric and electrical properties of la sub 0 9 sub sr sub 0 1 sub mno sub 3 sub manganite in alternating current |
| topic | La<sub>0.9</sub>Sr<sub>0.1</sub>MnO<sub>3</sub> sintering temperature electrical conductivity hopping tunneling polarization and dielectric properties |
| url | https://www.mdpi.com/1996-1944/15/10/3683 |
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