Hydrothermal synthesis of ATiO3 nanocrystalline compounds (A=Sr,Ca) doped with Fe2+, Ni2+, Mg2+

• Grant number: 10/02670-5
• Support Opportunities: Regular Research Grants
• Start date: August 01, 2010
• End date: September 30, 2012
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
• Principal Investigator: Valmor Roberto Mastelaro
• Grantee: Valmor Roberto Mastelaro
• Host Institution: Instituto de Física de São Carlos (IFSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
• Associated researchers: Maria Inês Basso Bernardi ; Mário Lúcio Moreira

Abstract

The process of addition of dopants has been widely used in the processing of new materials. The incorporation of atoms or ions of certain elements in a host matrix has led to obtain new materials with new properties and applications. In nanocrystalline materials, the process of doping has been considered of fundamental importance to stabilize certain crystalline phases and modify the material physical and chemical properties. The conventional hydrothermal synthesis method when assisted by microwaves have provided to obtain materials on a scale ranging from nano to micron showing physical and chemical properties different for the same material obtained through more conventional methods of synthesis. The objectives of this research project are the synthesis and characterization of ATiO3 (A = Sr, Ca) doped with the ions Mg2 + or Ni2 + or Fe2 + by the conventional hydrothermal method and hydrothermal method assisted by microwave. It is hoped through this project to evaluate the effect of synthesis parameters (temperature and time), the introduction of doping and the use of microwave or not the process of nucleation, growth and physical properties of these compounds. The verification of the effects by the modification of the parameters of synthesis and the introduction of dopants on the physical properties of the materials will be accomplished through the use of a series of characterization techniques such as X-ray diffraction, Raman spectroscopy and absorption of X-ray , scanning electron microscopy and transmission and photoluminescence.It is hoped that the end of the work have contributed to a better understanding of the effects of processing the hydrothermal method assisted by microwave or not and the effect of the addition of dopants in this class of nanostructured compounds. (AU)