resumo
The ceramic Sr(NiNb)(0.5)O-3, incorporating silver doping in the A site, was synthesized using a sol-gel route and subjected to comprehensive analysis through various experimental techniques. X-ray diffraction data analysis indicates a rhombohedral crystal structure. Scanning electron microscopy (SEM) examination reveals densely packed grains with minimal surface porosity. A thorough investigation of electrical properties, encompassing dielectric constant, loss tangent, electrical impedance, modulus, conductivity, etc., was conducted across a wide frequency range (10(3)-10(6) Hz) and temperature range (260-340 K). This analysis provided valuable insights into structure-property relationships and conduction mechanisms. The discussion highlights the significance of interface effects, space charge polarization, and Maxwell-Wagner dielectric relaxation in achieving the material's high dielectric constant at low frequencies and elevated temperatures. Examination of temperature dependence through Nyquist plots elucidates the contributions of grain behavior to the material's resistive and capacitive properties. The dielectric permittivity, dissipation of energy, and electrical characteristics like impedance, modulus and conductivity are notably influenced by the frequency of the applied electric field and temperature. Overall, the material exhibits promising potential for industrial applications such as energy storage, given its intriguing properties.
palavras-chave
IMPEDANCE SPECTROSCOPY PROPERTIES; ELECTRICAL-PROPERTIES; CONDUCTIVITY; BEHAVIOR; SITE
categoria
Materials Science
autores
Tayari, F; Benamara, M; Lal, M; Essid, M; Thakur, P; Kumar, D; Teixeira, SS; Graça, MPF; Nassar, KI
nossos autores
Kais Iben Nassar
Bolseiro de pós-Doutoramentoagradecimentos
The authors extend their appreciation to the Deanship of Research and Graduate Studies at King Khalid University for funding this work through Large Research Project under grant number RGP2/201/45. The authors are grateful to i3N (LA/P/0037/2020, UID-B/50025/2020, and UID-P/50025/2020) financed by COMPETE 2020 Program and national funds through the FCT/MEC and FEDER under the PT2020 Partnership Agreement. This work is funded by national funds (OE) through FCT-Fundacao para a Ciencia e a Tecnologia, I.P., in the scope of the framework contract foreseen in the numbers 4, 5, and 6 of article 23 of the Decree-Law 57/2016, of August 29, changed by Law 57/2017, of July 19.