Paper Title:
Synthesis and Enhanced Proton Conduction in a 20 mol% Ytterbium Doped Barium Zirconate Ceramic Using Zn as Sintering Aid
  Abstract

20% Ytterbium (III)-doped perovskite structured barium zirconate, BaZrO3, was prepared by two different synthesis routes: solid state and sol-gel routes. 2 % Zinc (II) was added as an acceptor dopant at the Zr (IV) site according to stoichiometry. It was also added as 2 % excess of the formula. The purpose of this study is to see how zinc (II) acts as a sintering aid in view of synthesis route, densification and conductivity of the material. A dense ceramic (90% of theoretical density) was achieved by the sol-gel method when stoichiometry was adjusted. Phase purity of the samples was checked by X-ray powder diffraction (XRD). Thermogravimetric analysis (TGA) and Impedance spectroscopy (IS) was used to characterize hydration and electrical conductivity respectively.The data shows that the addition of stoichiometric amounts of Zn2+ via sol-gel synthesis route promotes not only densification but also water incorporation and conductivity in comparison with the solid state route, keeping the same final sintering temperature of 1500°C. For example, pre-hydrated BaZr0.78Zn0.02Yb0.2O3-δ, prepared via the sol-gel method shows total conductivity (σtot) value of 3.14*10-5 and 3.8*10-3 Scm-1, whereas for the solid state route, σtot values are 1.74*10-5 and 8.87*10-4 Scm-1 under dry Ar (heating cycle) at 300° C and 600° C, respectively.

  Info
Periodical
Chapter
Chapter 6: Composite Materials
Edited by
Wu Fan
Pages
1181-1186
DOI
10.4028/www.scientific.net/AMM.110-116.1181
Citation
S. M.H. Rahman, I. Ahmed, S. G. Eriksson, "Synthesis and Enhanced Proton Conduction in a 20 mol% Ytterbium Doped Barium Zirconate Ceramic Using Zn as Sintering Aid", Applied Mechanics and Materials, Vols. 110-116, pp. 1181-1186, 2012
Online since
October 2011
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Katsuyoshi Kakinuma, Hiroshi Yamamura, Tooru Atake
Abstract:We have discovered a high oxide ion conductor within the perovskite-type (Ba1-x-ySrxLay)InO2.5+y/2 solid-solution system. The system was...
159
Authors: Gianfranco Dell'Agli, Giuseppe Mascolo, Maria Cristina Mascolo, Concetta Pagliuca, Paolo Perna, Umberto Scotti Di Uccio
Abstract:Mechanical mixtures of zirconia xerogel with variable content of crystalline Y2O3 up to 25 mol%, were hydrothermally treated by microwave...
391
Authors: Xiao Ya Li, Yun Yu, Dong Li Wang, Li Dong Chen
Abstract:[Ca2(Co0.65Cu0.35)2O4]0.624CoO2 polycrystalline samples were prepared using sol-gel method followed by spark plasma sintering....
805
Authors: Ming Zhou, Yan Wen Tian
Abstract:This experiment composes irreversible cells using ultrafine electrolyte materials and platinum slices, to measure the ionic conductivity the...
799
Authors: Monica Sindhu, N. Ahlawat, Sujata Sanghi, Ashish Agarwal, A. Ashima, Rekha Kumari, Navneet N. Ahlawat
Chapter 4: Electronic Materials
Abstract:Potassium Sodium Niobate, Na0.5K0.5NbO3 is a promising base material for lead free piezoceramics. The polycrystalline sample Na0.5K0.5NbO3...
210