Ba(Ti1 - xZrx)O3 (x = 0,05 and 0,08) Ceramics Obtained from Nanometric Powders: Ferroelectric and Dielectric Properties

We have used the Pechini's technique for synthesizing nanometric powders of Ba(Ti 1−x Zr x )O 3 (x = 0.05 and 0.08), named BTZ5 and BTZ8, respectively. The calcined powders at 750°C/2 h presented single crystalline phase and showed average particle size of about 50 nm. The BTZ sintered ceramics presented density close to 95 ± 1% and an average grain size of 1 μm. The samples showed a broader peak in the permittivity and decreasing in the maximum dielectric constant. We also observed a decrease in Curie temperature with the increased of the Zr concentration. The remnant polarization was also studied and presented dependence with the grain size.

[1]  A. Hernandes,et al.  Pós nanométricos de BaZrO3: preparação e caracterização de cerâmicas , 2005 .

[2]  J. Bera,et al.  On the formation mechanism of BaTiO3–BaZrO3 solid solution through solid-oxide reaction , 2005 .

[3]  Zhe Zhao,et al.  Grain-size effects on the ferroelectric behavior of dense nanocrystalline BaTiO 3 ceramics , 2004 .

[4]  H. Chan,et al.  Effects of grain size on the dielectric properties and tunabilities of sol–gel derived Ba(Zr0.2Ti0.8)O3 ceramics , 2004 .

[5]  A. Bhalla,et al.  Phase transition studies of sol-gel deposited barium zirconate titanate thin films , 2004 .

[6]  Ruyan Guo,et al.  Piezoelectric and strain properties of Ba(Ti1−xZrx)O3 ceramics , 2002 .

[7]  R. Guo,et al.  Micro-Raman scattering and dielectric investigations of phase transition behavior in the BaTiO3–BaZrO3 system , 2001 .

[8]  Ruyan Guo,et al.  Orientation dependence of the ferroelectric and piezoelectric behavior of Ba(Ti1−xZrx)O3 single crystals , 2000 .

[9]  I. Chen,et al.  Sintering dense nanocrystalline ceramics without final-stage grain growth , 2000, Nature.

[10]  S. Mathur,et al.  Sol-Gel Synthesis of Nano-Scaled BaTiO3, BaZrO3 and BaTi0.5Zr0.5O3 Oxides via Single-Source Alkoxide Precursors and Semi-Alkoxide Routes , 2000 .

[11]  G. Messing,et al.  Metal Organic Resin Derived Barium Titanate: I, Formation of Barium Titanium Oxycarbonate Intermediate , 1993 .

[12]  G. Arlt,et al.  Dielectric properties of fine‐grained barium titanate ceramics , 1985 .

[13]  G. Simon,et al.  Diffuse Ferroelectric Phase Transitions in Ba(Ti1-yZry)O3 Ceramics , 1982 .

[14]  E. Swiggard,et al.  Preparation of barium titanyl oxalate tetrahydrate for conversion to barium titanate of high purity , 1956 .

[15]  S. S. Flaschen.  An Aqueous Synthesis of Barium Titanate , 1955 .

[16]  L. Alexander,et al.  Determination of Crystallite Size with the X‐Ray Spectrometer , 1950 .