najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМО10.17586/2220-8054-2023-14-4-467-478najo-180Research ArticleCHEMISTRY AND MATERIALS SCIENCEХИМИЯ И НАУКА О МАТЕРИАЛАХStructural, electrical, optical and phase investigation of perovskite barium zirconate (BaZrO3) nanoparticles prepared through auto-combustion techniqueСтруктурное, электрическое, оптическое и фазовое исследование наночастиц цирконата бария (BaZrO3) со структурой перовскита, полученных методом горенияhttps://orcid.org/0009-0006-5388-0816АбималарДж.AbimalarJ.

J. Abimalar 

Nagercoil – 629003, Tamil Nadu; Abishekapatti, Tirunelveli – 627012, Tamil Nadu

https://orcid.org/0000-0001-6298-1498Анслин ФербиВ.Anslin FerbyV.

V. Anslin Ferby

Nagercoil – 629003, Tamil Nadu; Abishekapatti, Tirunelveli – 627012, Tamil Nadu

Department of Physics and Research Centre, Scott Christian College (Autonomous); Manonmaniam Sundaranar UniversityIndia202303062025144467478Copyright © Abimalar J., Anslin Ferby V., 20252025Абималар Д., Анслин Ферби В.Abimalar J., Anslin Ferby V.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://nanojournal.ifmo.ru/jour/article/view/180

The BaZrO3 ceramics were prepared via sol-gel auto-combustion technique with three Fuel to Oxidant (F/O) ratios (ϕ = 0.5, 1.0 and 1.5) and annealed at 1200 ◦C for 2 hours. X-ray diffraction (XRD) and Rietveld refinement data confirmed the cubic perovskite phase with the Pm3m (221) space group. These three samples are well indexed in JCPDS no: 06-0399. The ratio F/O = 1.0 gives one a small crystallite size and very high surface area. The ratio F/O = 1.5 provides a very high crystallite size and very low dislocation density. The oxygen vacancies in the samples were analyzed using Raman spectroscopy. The optical band gap energy value increases from 2.02 to 3.09 eV with increasing F/O ratio. Using of impedance spectroscopy for BaZrO3 at room temperature allows us to reveal decreasing Ionic conductivity with an increasing F/O ratio. The Nyquist plot for all samples exhibits a circular arc in the high-frequency zone and nearly a straight line in the low-frequency region. Due to the presence of low grain boundary with high ionic conductivity the BaZrO3 electrolyte material is used for energy storage in devices. 

Керамика BaZrO3 была приготовлена методом золь-гель-горения с тремя соотношениями топлива к окислителю (F/O) (φ = 0.5, 1.0 и 1.5) и отожжена при 1200°C в течение 2 часов. Данные рентгеновской дифракции (РФА) и уточнение методом Ритвельда подтвердили присутствие фазы со структурой кубического перовскита с пространственной группой Pm3 ̅m (221). Эти три образца проиндексированы в JCPDS под номером: 06-0399. Отношение F/O = 1.0 дает небольшой размер кристаллитов и очень большую площадь поверхности. Отношение F/O = 1.5 обеспечивает очень большой размер кристаллитов и очень низкую плотность дислокаций. Кислородные вакансии в образцах анализировались с помощью рамановской спектроскопии. Значение энергии запрещенной оптической зоны увеличивается с 2.02 до 3.09 эВ с увеличением отношения F/O. Использование импедансной спектроскопии BaZrO3 при комнатной температуре позволило выявить уменьшение ионной проводимости с увеличением отношения F/O. График Найквиста для всех образцов представляет собой дугу окружности в высокочастотной зоне и почти прямую линию в низкочастотной области. Благодаря наличию низкой границы зерен с высокой ионной проводимостью материал электролита BaZrO3 используется в устройствах хранения энергии.

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The authors declare that there are no conflicts of interest present.