Preparation, characterization and dielectric tunability of La2NiMnO6 ceramics

• Published in: Journal of alloys and compounds Vol. 590; pp. 541 - 545
• Main Authors: Li, Changnian, Liu, Bangxu, He, Yanyan, Lv, Chao, He, Hua, Xu, Yebin
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 25.03.2014; Elsevier
• Subjects: Alloys; Ceramics; Chemical synthesis methods; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Cross-disciplinary physics: materials science; rheology; Dielectric properties of solids and liquids; Dielectric response; Dielectrics, piezoelectrics, and ferroelectrics and their properties; Differential scanning calorimetry; Electric fields; Exact sciences and technology; Field emission; Materials science; Mathematical models; Methods of nanofabrication; Oxide materials; Permittivity (dielectric function); Physics; Polyvinyl alcohols; Sol gel process; Sol–gel processes; Dielectric response; Ceramics; Sol–gel processes; Oxide materials; Differential scanning calorimetry; Polarization; Thermogravimetry; XRD; Field emission electron microscopy; Nanoparticles; Electric field effects; Sintering; Sol―gel processes; Fourier-transformed infrared spectrometry; Microstructure; Permittivity; Sol-gel process; Nanomaterial synthesis
• DOI: 10.1016/j.jallcom.2013.12.170
• ISSN: 0925-8388

•PVA sol–gel route was used for the synthesis of La2NiMnO6.•The single-phase La2NiMnO6 was prepared successfully at 600°C.•La2NiMnO6 ceramics show dielectric tunability.•The ɛ–E relation was described by the “multi-polarization mechanism” model. La2NiMnO6 powders were prepared by using a polyvinyl alcohol (PVA) sol–gel route. Differential scanning calorimetry (DSC), thermogravimetric (TG) analysis, Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM) were used to characterize the precursors and the derived oxide powders. Single-phase La2NiMnO6 of about 40–50nm diameters was synthesized at 600°C for 2h, without the formation of any intermediate phase. La2NiMnO6 ceramics sintered at 1000°C had tunability of 28% and 20% at 8V/mm at 100kHz and 1MHz, respectively. The electric field dependence of dielectric constant of the ceramics was well described by using the “multi-polarization mechanism” model.