Raman spectroscopy of (K,Na)NbO3 and (K,Na)(1-x)LixNbO3

We report Raman spectroscopy in all four phases of a (K0.5+delta Na0.5-delta)NbO3 (delta similar to 0.03) crystal and ((K0.5+delta Na0.5-delta)(1-x)Li-x)NbO3 for x=0.02 and 0.03. The phase transitions in the Li-free crystal are homogeneous and hysteretic, with no mixed-phase region between the rhombohedral and orthorhombic phases. Raman spectra in the lowest-temperature phase in the Li-doped material differ significantly from those at x=0 and suggest a structural phase boundary at a Li concentration of less than 2%.


Published in:
Applied Physics Letters, 93, 26, 262901
Year:
2008
Keywords:
Laboratories:




 Record created 2009-06-25, last modified 2018-03-17


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