Ferroelectric response of Na0.9Li0.1NbO3 at room temperature

5th Colombian Conference of Engineering Physics

物理学;工业技术

Isaza-Zapata, V.^1 ; Arias, A.^1 ; Maya, C.^1 ; Martínez, W.^1 ; Agudelo, A.^1 ; Alvarez, B.^1 ; Gómez, A.^2 ; Izquierdo, J.L.^1,3

Institución Universitaria Pascual Bravo, Facultad de Ingeniería, Laboratorio de Materialografía, Grupo GIIEN, Calle 73 No. 73A-226, Medellín

A.A. 6564, Colombia^1

Universidad Nacional de Colombia, Facultad de Minas, Escuela de Materiales y Minerales, Medellín

A.A. 568, Colombia^2

Universidad Nacional de Colombia, Facultad de Ciencias Básica, Grupo de Materiales Cerámicos y Vítreos, Medellín

A.A. 568, Colombia^3

关键词: Diffractograms;    Electrical characterization;    Electrical polarization;    Ferroelectric response;    Hysteretic behavior;    Niobates;    Orthorhombic structures;    Polycrystalline samples;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/850/1/012009/pdf
DOI  :  10.1088/1742-6596/850/1/012009

学科分类：工业工程学

来源: IOP

【 摘 要 】

Polycrystalline samples of the dielectric, ferroelectric Na0.9Li0.1NbO3were synthesized by means of solid-state reaction using different ramps of temperature. High purity precursors Nb2O5, Na2CO3and Li2CO3were stoichiometricaly mixed and heated at 1373 K for 6 hours in air atmosphere. The Na0.9Li0.1NbO3samples were characterized by means of diffraction of X-rays using a Panalytical X'Pert Pro diffractometer. The obtained diffractograms were refined by Rietveld procedure using the software Maud. The results show that Na0.9Li0.1NbO3crystallizes in an orthorhombic structure (space group Pbma). The refined diffraction patterns also suggest a possible replacement of the Na ions by Li ions in the parent, ferroelectric NaNbO3compound. For electrical characterization of the samples, electrical polarization curves were measured using a Radiant Technologies RT66A test system for ferroelectric materials. The polarization versus applied electrical dependence shows a hysteretic behavior verifying the ferroelectric character of the material. A maxima polarization of 130 μC/m2is obtained at room temperature.