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Characterization of Calcium Titanate–Magnesium Titanate Eutectic by Scanning Microwave Microscopy
Author(s) -
Zhang Qinxin,
McGinn Paul J.
Publication year - 2006
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2006.01326.x
Subject(s) - materials science , microstructure , scanning electron microscope , dielectric , eutectic system , calcium titanate , microwave , titanate , mineralogy , analytical chemistry (journal) , composite material , ceramic , chemistry , optoelectronics , physics , chromatography , quantum mechanics
Microstructure and dielectric properties in a CaTiO 3 (CT)–MgTiO 3 (MT) diffusion couple were studied by scanning electron microscopy (SEM) and near‐field scanning microwave microscopy (SMM). Complex microstructures containing Mg 2 TiO 4 (M2T) and MgTi 2 O 5 (MT2) phases as well as eutectic structures of CT–MT and MT2–CT developed during cooling from the melt. Variations in the local dielectric properties observed in SMM images are correlated with the microstructures characterized by SEM/EDS. The SMM characterization clearly distinguished low‐dielectric‐constant MT and high‐dielectric‐constant CT phases. The M2T, MT, and MT2 phases have similar dielectric properties, and were more difficult to distinguish in the SMM. The phase development during melting and solidification, and SMM imaging limitations are discussed.