INFLUENCE OF SYNTHESIS PARAMETERS ON ELECTRICAL PROPERTIES OF SISTEMS MgO-TiO2

Abstract

Abstract:In this paper magnesium carbonate (MgCO 3 ) and titanium-dioxide (TiO 2 ), crystalline modification rutile were used as starting powders.. Process of sintering can be enhanced if mechanical activation precedes. Mechanical activation of the starting mixture was performed by high energy ball milling using ZrO balls and vessels with ball to powder mass ratio 40:1. The observed grinding times were 15, 30, 60 and 120 minutes. The isothermal sintering of compacted powders was conducted at 1100 o C during 30, 60 and 180 minutes. For specimens synthesized in such a manner, microwave dielectric properties were measured, quality factor Q, specific electrical resistivity (ρ) and the dielectric constant (ε r ).

Influence of the Synthesis Method on the Preparation Composites Derived from TiO2-LDH for Phenol Photodegradation

“…The TiO 2 anatase phase in this composite is seen in a small peak of (110) plane at 25.4 o 2θ (JCPDS 01-089-4921) suggesting that only a small part of Ti exists in this phase and the rest is dispersed over the MgAl mixed oxide [21]. Supporting the above statement, no diffraction spikes attributed to the MgAl mixed oxide can be observed, suggesting that the impregnated TiO 2 particles are disaggregated [24] when mixed with the LDH gel and prior to the heat treatment of the composite, achieving a chemical interaction between the composites resulting in the formation of the MgTiO 3 phase [25]. These results confirm the addition of TiO 2 in the composites.…”