CCTO is a single crystalline. No secondary phase present. However, I observed Raman modes assign to Cu-O rotation-like. In addition, the intense peaks for TiO6 octahedral does not change in position as varied stoichiometry. Any ideas?
REFERENCE:
[A] Pls find the paper in the attachment]
[A]The abstract of the paper is reproduced for your perusal and authentication.
Ferroelectric-like hysteresis loops of CaCu3Ti4O12 (CCTO) ceramic have been observed.We found that this unusual feature does not arise from the displacement of the Ti ions in the TiO6 octahedron, but apparently comes from the charges at the grain boundaries which consist of a CuO layer. The relaxation time of 2.9 milliseconds by the charges from the grain boundary, nearly corresponding to the inverse P − V sampling frequency of 1kHz, has been found in the impedance spectrum. According to the micro-Raman mapping, the CuO layer is found in the grain boundary and is perfectly distinguished from the CCTO grain.
tq. good reference to explain the disorder of cation in CCTO using raman analysis
:)
tq my friend. i mentioned disorder of cation is referring to ca/cu at A-site position, after we understnd there is no substitution between Cu/Ti as proposed from previous litertures. the sample i prepred before is free from impurity. that y i ask this question to ensure the additionl one raman peak tht i hve found in pure ccto might be from Cu-O bonding. :)
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