tailieunhanh - The effect of size on structural and optical properties of microwave dielectric ZrTiO4 powders

In the present work, we use various routes, such as sol-gel, hydrothermal and solid state reaction methods, to synthesize zirconium titanate (ZrTiO4) and investigate the crystal structure, particle size distribution, morphology and optical properties of the calcined powders. | JOURNAL OF SCIENCE OF HNUE Interdisciplinary Science 2013 Vol. 58 No. 5 pp. 3-10 This paper is available online at http THE EFFECT OF SIZE ON STRUCTURAL AND OPTICAL PROPERTIES OF MICROWAVE DIELECTRIC ZrTiO4 POWDERS La Qui Hoan1 and Nguyen Van Minh2 1 College of Education Thai Nguyen University 2 Faculty of Physics Hanoi National University of Education Abstract. In the present work we use various routes such as sol-gel hydrothermal and solid state reaction methods to synthesize zirconium titanate ZrTiO4 and investigate the crystal structure particle size distribution morphology and optical properties of the calcined powders. The main purpose of this study is to investigate the effect of size on the structural and optical properties of ZrTiO4 powders. X-ray diffraction XRD patterns optical absorption and Raman scattering were applied as the probes for the evolution of crystalline size and distribution of ZrTiO4 powders. The small physical dimensions of ZrTiO4 crystals leads to a shift and broadening of the first-order Raman bands. The details of the evolution of the size and distribution of the particles on the 630 and 800 cm 1 Raman line shape frequency broadening and asymmetry are presented. The XRD scanning electron microscopy SEM absorption and Raman scattering results of ZrTiO4 powders suggests evidence of an effect at the grain size. Keywords Effect size structural and optical properties ZrTiO4 powders XRD SEM. 1. Introduction Recently zirconium titanate-based compositions have become extensively used as dielectric resonators in microwave telecommunications 1 . They also are of interest for a wide range of applications including catalysis humidity sensors high-temperature pigments and composites 2 . It is known that all forms of ZrTiO4 have the orthorhombic structure of α-PbO2 3 and belong to the space group Pbcn. The stoichiometry of zirconium titanate is known to be an important factor for ensuring good properties 2 4 . In order to obtain .

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