CJ-VOLUME 05 ISSUE 02 MARCH 2015


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Volume 5 Issue 2, March 2015

Chemistry Journal

ISSN

2049-954X

Publication Frequency

6 Issues per year

Pages

20-39

Publication History


Original Articles

A Review of Synthesis and Properties of Hydroxyapatite/Alumina Nano Composite Powder

S. Tayyebi, F. Mirjalili, H. Samadi and A. Nemati

Pages 20-28

T-x-y Phase Diagram of the System Tl-TlCl-S

D.M. Babanly, S.M. Bagheri, Z. Jamalarai, G.M.Guseynov and D.B.Taghiyev

Pages 29-34


Phase Equilibria in the YbTe-Bi2Te3-Te System

Ziya Sakhaveddin Aliev, Konul Dagdalan Rasulova, Samira Zakir Imamaliyeva, and Mahammad Baba Babanly

Pages 35-39


Title

A Review of Synthesis and Properties of Hydroxyapatite/ Alumina Nano Composite Powder

Abstract

Calcium Phosphate Ceramics (CPCs) have been widely used as bio-materials for the regeneration of bone tissue because of their ability to induce osteoblastic differentiation in progenitor cells. Among calcium phosphate ceramics; Dicalcium Phosphate dihydrate (CaHPO4.2H2O) (DCPD), Tri Calcium Phosphate (Ca3 (PO4)2 (TCP), Tetra Calcium Phosphate (Ca4P2O9 (TTCP), Octa Calcium Phospha-te [(Ca8H2 (PO4)6] (OCP) and Hydroxyapatite [(Ca10 (PO4)6 (OH)2] (HA) have been studied for application in medical fields. Hydroxya-patite (HA) is one of the most investigated bioceramics due to its bi-ocompatibility and bioactivity. Hydroxyapatite biocomposites are ceramic materials that exhibit excellent bioactivity, but their inhere-nt low fracture strength and toughness render them unusable for practical applications. Alumina (Al2O3) is added to improve the me-chanical properties without diminution of biocompatibility. The rev-iew summarises the hydroxyapatite, its weaknesses and strategies for the improvement of its mechanical properties.

Keywords

Calcium Phosphate, Hydroxyapatite, Biocomposite

Title

Extractive Spectrophotometric Determination of Nickel with 2-hydroxy-5-iodothiophenol and Diphenylguanidine

Abstract

The phase equilibriums in the ternary system Tl-S-Cl were investig-ated in Tl-TlCl-S composition area using methods differential ther-mal analysis, X-ray analysis, and electromotive force measuremen-ts. A series of polythermal sections, an isothermal section at 300 K of the phase diagram as well as a projection of the liquidus surface were constructed. Outlined the areas of primary crystallization of five phases, including the only ternary compound of the system -Tl6SCl4. It was established that, the main feature of the system is the existence of wide immiscibility areas, including two fields of triple immiscibility covering nearly 90% of the liquidus surface. The tern-ary compound Tl6SCl4 primary crystallizes in a narrow compositi-on region considerably remote from its stoichiometric composition. Types and coordinates of all non- and mono-variant equilibria in the T-x-y diagram were determined.

Keywords

Chalcogen-Halides, Phase Equilibrium, Solid-Phase Diagram, Liquidus Surface, Radiation Detectors, Thermoelectric Materials

Title

Phase Equilibria in the YbTe-Bi2Te3-Te System

Abstract

The phase equilibria in the YbTe-Bi2Te3-Te concentration area of Yb-Bi-Te ternary system were investigated by means of Differential Thermal Analysis (DTA), X-Ray Diffraction (XRD) and Scanni-ng electron microscope with energy dispersive analysis (SEM-EDS) techniques as well as EMF measurements. The YbTe-Bi2Te3, Yb0,1Te0,9-Bi0,4Te0,6 and (YbTe) (Bi2Te3)-Te isopleth sections and liquidus surface projection were constructed. The primary crystalli-zation fields of phases, the character and temperatures of the invar-iant and monovariant processes were determined. The existence of the ternary compounds including YbBi2Te4 and YbBi4Te7 reported earlier were not confirmed. It was shown that the solubili-ty of YbTe in Bi2Te3 is ~10 mol% at room temperature. 

Keywords

Phase Equilibria, YbTe-Bi2Te3-Te System, Differential Thermal Analysis, X-Ray Diffraction