Abstract
The domain structures and phase evolution in mixed ferroelectric (Fe): KTa1−xNbxO3 (KTN) crystals were investigated. Temperature dependent Raman spectra show that Curie temperatures of KTN and Fe: KTN are far below room temperature, but the ferroelectric domain switching was still visualized by scanning probe microscopy at room temperature. These observed domains origin from the nano-regions near the grain boundaries. In addition, the intrinsic domains (triangle for KTN and straight line/stripe for Fe: KTN) could only be observed at low temperature by transmission electron microscopy. Three phase transitions in Fe: KTN crystals were found by Raman spectroscopy and dielectric testing: 175K for Rhombohedral-to-Orthorhombic (R–O), 210K for Orthorhombic-to-Tetragonal (O–T) and 250K for Tetragonal-to-Cubic (T–C), which is consistent with the domain behavior.
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