Synthesis and characterization of BaTio3 powder prepared by combustion synthesis process

Abstract

The rapid growth of the electronic component industry has led to a demand for miniatured multilayer ceramic capacitor (MLCC), where BaTiO3 is used due to its superior frequency characteristics, higher reliability, high breakdown voltage, excellent volumetric efficiency of the capacitance and reduced cost. MLCCs with a dielectric thickness of 2 µm have already been commercialized but the next generation components demand a thickness of 1 µm. Such requirement demands dielectric powders with uniform composition and size distribution, and weak agglomeration to allow low temperature sintering with minimum grain growth. Various methods of preparation of BaTiO3 is available in the literature. The solid state route needs high calcinations temperature to get perovskite phase and often results in the formation of multiphase and inhomogeneous powders. High energy ball milling is also reported to produce 10nm particle size but the approach suffers from small batch size, high processing time and energy consumption. The complex double metal salts methods involve the use of solid precursors for the manufacture of pure BaTiO3. The process suffers from the use of costly materials, multisteps, uncontrolled particle size and interparticle agglomeration. But A simple soft chemical method of synthesizing barium titanate nanopowders is described here, which is simple and cost effective, where titanium dioxide/titanium isopropoxide was taken as a source of titanium, and tartaric acid was taken as a template material, nitric acid as an oxidizing agent. The synthesized powders then characterized by XRD, TG and DTA, SEM spectroscopy. In this process phase pure barium titanate nanopowders can be prepared at a temperature of 900 °C.