Aydin Cihat, Aydin Handan, Taskin Mustafa, Yakuphanoglu Fahrettin
Department of Metallurgy and Materials Engineering, Faculty of Technology, Firat University, Üniversite Mahallesi, 23119 Elazig, Turkey.
Department of Metallurgy and Materials Engineering, Faculty of Engineering, Munzur University, Aktuluk Kampüsü, 62000 Merkez, Tunceli, Turkey.
J Nanosci Nanotechnol. 2019 May 1;19(5):2547-2555. doi: 10.1166/jnn.2019.15841.
Lanthanum Ferrite based nanocomposites were prepared with various Graphene oxide contents by the hydrothermal method. The crystalline structure, morphological properties, electrical and optical properties of samples were investigated. X-ray diffraction results indicate that all the nano electroceramics are polycrystalline with an Orthorhombic structure. Results from scanning and transmission electron microscopes indicate that the Bismuth ferrite/Graphene oxide powders have nanostructure. The optical band gaps of the nano electroceramics were calculated for the various amount of Graphene oxide. The electrical properties of samples were investigated with the temperature depend on conductivity measurements. The measurement shows that the electrical conductivity changes with increasing temperature and graphene oxide dopants of all samples. Activation energy () values of the nanocomposites decrease with increasing graphene oxide content. The dielectric properties of Lanthanum Ferrite/Graphene Oxide nanocomposites (real and imaginer) with respect to frequency variation (1 KHz-5 MHz) were measured at room temperature. The relative permittivity ('), dielectric loss (″) and alternating current conductivity () values of the samples were estimated. It is show that ('), (″) and () increase with increasing frequency. The polarization-electric field hysteresis loop of all Lanthanum Ferrite/Graphene Oxide nano electroceramics was measured at the room temperature. The loop shows proper saturation with enhanced saturation polarization (), remnant polarization () and coercive electric field (). The obtained findings suggest that the physical and electrical properties of Lanthanum Ferrite/Graphene Oxide nano electroceramics can be changed by Graphene Oxide doping. These materials can be used for a variety of technological applications in the field of dielectric and ferroelectric.
采用水热法制备了具有不同氧化石墨烯含量的镧铁氧体基纳米复合材料。研究了样品的晶体结构、形貌特性、电学和光学性质。X射线衍射结果表明，所有纳米电子陶瓷均为具有正交结构的多晶体。扫描电子显微镜和透射电子显微镜的结果表明，铋铁氧体/氧化石墨烯粉末具有纳米结构。计算了不同氧化石墨烯含量的纳米电子陶瓷的光学带隙。通过测量电导率随温度的变化来研究样品的电学性质。测量结果表明，所有样品的电导率均随温度和氧化石墨烯掺杂剂的增加而变化。纳米复合材料的活化能（）值随氧化石墨烯含量的增加而降低。在室温下测量了镧铁氧体/氧化石墨烯纳米复合材料（实部和虚部）相对于频率变化（1kHz - 5MHz）的介电性能。估算了样品的相对介电常数（'）、介电损耗（″）和交流电导率（）值。结果表明，（'）、（″）和（）随频率的增加而增大。在室温下测量了所有镧铁氧体/氧化石墨烯纳米电子陶瓷的极化 - 电场滞后回线。该回线显示出适当的饱和，具有增强的饱和极化（）、剩余极化（）和矫顽电场（）。所得结果表明，通过氧化石墨烯掺杂可以改变镧铁氧体/氧化石墨烯纳米电子陶瓷的物理和电学性质。这些材料可用于介电和铁电领域的各种技术应用。
