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Title in Portuguese: The thermal stability of (CaTiO3)1−x (Cr3/4Fe5/4O3)x ceramic composites in the microwave region
Author: Freire, Francisco Nivaldo Aguiar
Santos, Manoel Roberval Pimentel
Rocha, Hélio Henrique Barbosa
Almeida, Ana Fabíola Leite
Sales, Antônio Jefferson Mangueira
Sombra, Antônio Sérgio Bezerra
Keywords: Ceramics
Dielectric properties
Issue Date: 2016
Publisher: Materials Sciences and Applications
Citation: FREIRE, F. N. A. et. al. The thermal stability of (CaTiO3)1−x (Cr3/4Fe5/4O3)x ceramic composites in the microwave region. Materials Sciences and Applications, v. 7, n. 4, p. 202-209, abril. 2016.
Abstract: The thermal stability, structural and dielectric properties of the (CaTiO3)1−x(Cr3/4Fe5/4O3)x ceramic composites with x = 0, 0.1, 0.5, 0.9 and 1 have been examined in microwave region. The samples were produced via the solid-state reaction. The orthorhombic structural phase of CaTiO3 and trigonal structural phase of Cr3/4Fe5/4O3 were confirmed by the X-Ray Powder Diffraction (XRPD). The XRPD patterns for composites reveal the quantities of each original phase present. The infrared spectra of the samples reinforce this structural verification indicating no or minimal occurrence of unwanted reactions. The first sample (x = 0) and last sample (x = 1) in this series exhibit the maximum and the minimum of the relative dielectric permittivity and values range from 140.1 to 8.3 respectively. The measured temperature coefficient of the matrix CaTiO3 was +921 ppm∙˚C−1 and for the matrix Cr3/4Fe5/4O3 was −56 ppm∙˚C−1. With the study of series of composites, it was possible to make a mathematical prediction for a composition reach the temperature coefficient near zero. The proposed ceramic has potential use as thermostable material in the microwave region and can be applied to resonators, low-noise amplifiers, filters, and so on.
metadata.dc.type: Artigo de Periódico
ISSN: 2153-117X
Appears in Collections:DEME - Artigos publicados em revista científica

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