The Thermal Stability of (CaTiO<sub>3</sub>)1-x (Cr<sub>3/4</sub>Fe<sub>5/4</sub>O<sub>3</sub>)<sub>x</sub> Ceramic Composites in the Microwave Region
The Thermal Stability of (CaTiO<sub>3</sub>)1-x (Cr<sub>3/4</sub>Fe<sub>5/4</sub>O<sub>3</sub>)<sub>x</sub> Ceramic Composites in the Microwave Region作者机构：Department of Mechanical Engineering Federal University of Ceara Campus do Pici Fortaleza Brazil Western Para Federal University (UFOPA) Santarem Brazil Department of Organic and Inorganic Chemistry Federal University of Ceara Campus do Pici Fortaleza Brazil Department of Physics Federal University of Ceara Campus do Pici Fortaleza Brazil
出 版 物：《Materials Sciences and Applications》 (材料科学与应用期刊（英文）)
年 卷 期：2016年第7卷第4期
页 面：202-209页
学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学]
主 题：Ceramics Composites Dielectric Properties
摘 要：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·℃-1 and for the matrix Cr3/4Fe5/4O3 was -56 ppm·℃-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.
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