Nanocrystalline powders of two indium tin oxide (ITO) polymorphs—rhombohedral and cubic—were prepared by a co‐precipitation process. The temperature and aging time of precipitates after co‐precipitation were controlled to obtain selectively the two different crystal structures. X ‐ray diffraction and transmission electron microscopy were used to characterize the powders. The electrical conductivity of the two ITO powders was determined by the powder solution composite method. The conductivities obtained were 0.26±0.04 and 0.65±0.17 S/cm for the rhombohedral and cubic ITO samples, respectively, the first such report for the rhombohedral phase.
A multiple-octahedral system of Pb ( Zn 1/3 Ta 2/3) O 3- PbTiO 3 was modified by 20 mol% BaTiO3 and perovskite formation tendencies were studied. Crystal symmetries and lattice parameters were determined. Low-frequency dielectric constant spectra and microstructures of the ceramics were examined. A cubic perovskite symmetry changed to tetragonal with increasing fractions of PbTiO3. Dielectric maximum temperatures shifted linearly with the compositional change.
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