AbdulKarim Z . Khalf | Kirkuk University (original) (raw)

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Papers by AbdulKarim Z . Khalf

Barium borosilicate (BBS) glass was added as a sintering aid to (Ba 0.7 Ca 0.3)TiO 3-Ba(Ti 0.8 Zr... more Barium borosilicate (BBS) glass was added as a sintering aid to (Ba 0.7 Ca 0.3)TiO 3-Ba(Ti 0.8 Zr 0.2)O 3 (BCZT) ceramics at levels from 2 to 15 wt%, yielding enhanced densification. The addition of BBS also induced changes in phase composition, from predominantly tetragonal to orthorhombic at room temperature. It is shown that the changes in phase content are caused by a shift of the orthorhombic to tetragonal phase transformation from below room temperature to ≈50°C. An additional high temperature transition around 120°C was also identified. These observations are interpreted in terms of the development of chemical heterogeneity associated with the redistribution of dopant elements (particularly Zr and Ca) through the liquid phase during sintering. The relative permittivity and electric field-induced polarisation values were generally degraded by the presence of the glass phase, but a reduction in ferroelectric hysteresis and improved densification behaviour have potential benefits in dielectric energy storage applications.

Diyala Journal for Pure Science, 2014

The compound of Ferroelectric nanopowrer Lead Zirconate Titanate (PZT) Pb(Zr x Ti 1-x)O 3 was pre... more The compound of Ferroelectric nanopowrer Lead Zirconate Titanate (PZT) Pb(Zr x Ti 1-x)O 3 was prepared using Oxalate method. Al 2 O 3 was doped using solid state sintering method as general system PZT/ x Al 2 O 3 at (x= 0.5, 1, 1.5 vol. %). The effects of Al 2 O 3 addition on the mechanical and physical properties of PZT ceramics were investigated. Increased Vickers Hardness with addition Al 2 O 3 to PZT which its maximum hardness value was found for the samples containing 1vol. %Al 2 O 3. Also, the maximum value of dielectric strength of containing 1vol.%Al 2 O 3. This is indicating that the addition Al 2 O 3 into PZT leads to improve dielectric properties of PZT ceramics. It is observed that the mechanical properties of the ceramics systems PZT/ x Al 2 O 3 are larger than of PZT ceramics.

Advanced Ceramic Materials, 2021

An overview of ferroelectric glass ceramics, some literature review and some of the important pre... more An overview of ferroelectric glass ceramics, some literature review and some of the important previous studies were focused in this chapter. Nanocrystalline glass–ceramics containing ferroelectric perovskite-structured phases have been included. All modified glasses having ferroelectric ceramics which prepared by different methods are discussed, that producing nanocrystalline glass–ceramics. Then particular tested to their use as dielectric energy storage materials. These materials exhibit promising dielectric properties, indicating good potential for high energy density capacitors as a result of their nanocrystalline microstructures. The results of the analysis are summarised in this chapter to provide an overview of the energy storage characteristics of the different materials produced during the study.

Barium Zirconate BaZrO3 fine powders were prepared by oxalate method using BaCl2.2H2O, TiCl4 and ... more Barium Zirconate BaZrO3 fine powders were prepared by oxalate method using BaCl2.2H2O, TiCl4 and oxalic acid as starting materials. The precursor (BaZrO(C2O4)2.xH2O) has been synthesized and characterized by combination of spectroscopic and thermal analysis. The precursor under goes thermal decomposition, in two major steps: dehydration to give anhydrous barium zirconyle oxalate and decomposition to produce BaZrO3 fine powders. BaZrO3 started to crystalline phase at 600 o C and became a pure phase at 800 o C

$Research paper thumbnail of Study of Density, Molar Volume, X-Ray Diffraction and Infrared Spectra of Phosphate Glasses$

International Journal of Applied Physics, 2021

Barium Zirconate BaZrO 3 fine powders were prepared by oxalate method using BaCl 2 .2H 2 O, TiCl ... more Barium Zirconate BaZrO 3 fine powders were prepared by oxalate method using BaCl 2 .2H 2 O, TiCl 4 and oxalic acid as starting materials. The precursor (BaZrO(C 2 O 4 ) 2 .xH 2 O) has been synthesized and characterized by combination of spectroscopic and thermal analysis. The precursor under goes thermal decomposition, in two major steps: dehydration to give anhydrous barium zirconyle oxalate and decomposition to produce BaZrO 3 fine powders.

Diyala Journal For Pure Science, 2014

Journal of the European Ceramic Society