Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Ferroelectric


Preparation and Study the Structure of Pure and Impure Barium Titanate with Zr4+ Ion

Mojahid M. Najim; Wasan A. Hekmat

Engineering and Technology Journal, 2019, Volume 37, Issue 1B, Pages 21-24
DOI: 10.30684/etj.37.1B.4

In this research, pure and impure barium titanate with Zr4+ ion with two molar ratios x= (5, 10) % have been synthesized by solid-state reaction technique. The powders calculations at two temperatures (950°C and 1400°C). An XRD technique was used in order to study the crystal structure of pure and impure barium titanate, which confirmed the formation of the tetragonal phase of BaTiO3, then calculate the lattice parameters of pure and impure barium titanate, the addition of zirconium ion Zr4+ lead to increases lattice parameters.

Studying The Dielectric and Structural Properties of Baxsr1-Xtio3 (BST) Ferroelectric System Prepared by Using Oxalic Acid Route

Sabah M. Ali Ridha; Rawa A. Helal

Engineering and Technology Journal, 2010, Volume 28, Issue 10, Pages 2015-2026

BaxSr1-xTiO3 (BST) ferroelectric nano, poly crystalline systems were
processed with three concentrations (x = 0.5, 0.7 and 0.9) using a technique known
as oxalic acid route. The XRD spectra were analyzed, and used Scherer formula to
estimate the crystallite size of the products, which reached to 15.4 nm at x = 0.5. It
is found that increasing of Sr+2 cations help to decrease the crystallite size of
BaxSr1-xTiO3 system and the tetragonality c/a increases when the crystallite size
increases. In physical tests we conclude that the oxalic acid method is a good
method to prepare a BST ferroelectric phase with high density (5.05, 5.5 and 5.45)
gm/cm3, and small porosity (16, 8, and11) % for (x = 0.5, 0.7 and 0.9)
respectively.