title: Dielectric characterization of (1-x)PMN-xPT (x = 0.07 and 0.10) ceramics synthesized by an ethylene glycol-based soft chemical route.
abstract: Materials based on relaxor ferroelectrics have become one of the most important families of functional materials being explored for such applications as sensors/actuators, micro-electromechanical systems (MEMS), non-volatile random access memories, and high-energy-density capacitors. Fabrication of high-quality relaxor-based ceramics remains, however, a challenging task. In this work, a new soft chemical synthetic method for the preparation of the complex perovskite-based relaxor ferroelectric solid solutions, (1-x)Pb(Mg(1/3)Nb(2/3))O(3)-xPbTiO(3) was developed using ethylene glycol as the solvent. Ceramics with compositions of x = 0.07 and 0.10 were prepared and it was found that a 10% stoichiometric excess of Pb(2+) was required to compensate for lead oxide volatility at the high temperatures used for sintering. The ceramics produced by this method show excellent dielectric properties at room temperature, such as a high dielectric constant (~20 000) and low loss over a large temperatures range (tan δ < 0.01 between 20 and 200°C). The temperature dependence of the dielectric constant exhibits typical relaxor ferroelectric behavior, fitting a quadratic law which describes the high-temperature slope of ε'(T) peak. The frequency dispersion of the temperature of maximum permittivity satisfies the Vogel-Fulcher law.
authors.affiliation: Department of Chemistry, Simon Fraser University, Burnaby, BC, Canada.
authors.forename: Hamel N
authors.initials: HN
authors.lastname: Tailor
authors.forename: Alexei A
authors.initials: AA
authors.lastname: Bokov
authors.forename: Zuo-Guang
authors.initials: ZG
authors.lastname: Ye
mesh_terms: D017610:Calcium Compounds / Q000737:chemistry*; D002516:Ceramics / Q000737:chemistry*; D055598:Chemical Phenomena; D004574:Electromagnetic Fields; D019855:Ethylene Glycol / Q000737:chemistry*; D006358:Hot Temperature; D007854:Lead / Q000737:chemistry*; D055617:Micro-Electrical-Mechanical Systems; D009556:Niobium / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D017610:Calcium Compounds; D010087:Oxides; C404734:lead magnesium niobate; C481719:lead titanate; D009556:Niobium; C059910:perovskite; D007854:Lead; D014025:Titanium; D019855:Ethylene Glycol