Properties of fluorine-doped PbMg1/3Nb2/3O3 ceramics

Optical phonon behavior of columbite MgNb2O6 single crystals

“…5 Besides, it is a suitable reference material for investigating defects introduced in LiNbO 3 substrates for waveguide fabrication 10 and a key precursor for the preparation of lead Magnesium niobate (PMN) ferroelectric ceramics, which is difficult to synthesize via the conventional solid-state reaction process using oxides as starting materials. 11,12 The potential applications of MgNb 2 O 6 , for microwave, photocatalysts, solar cell and laser active media, strongly depend on its optical phonon behavior by the intrinsic contribution of their polar phonon modes together with possible extrinsic contributions due to polarizable domains, grain boundaries, and polar defects. 13 In spite of the importance of its phonon characteristics, there is only one assignment of nonpolar Raman modes of powdered samples and normal coordinate analysis results reported by Husson et al up to now.…”