Crystal Research and Technology
Cryst. Res. Technol. 36 (2001) 893 - Abstract -

A. Molak, J. Kubacki

University of Silesia, Katowice, Poland

Structure of NaNbO3: xMn Single Crystals at Room Temperature

A series of NaNbO3: x Mn single crystals had been obtained by flux method. Manganese oxide was introduced to obtain nominal Mn content within 10%mol. Real concentration of Mn dopant was determined as one order lower. It was concluded from valence band analysis that Mn ions built in niobium sublatice mainly. All the samples exhibited discontinuous structural antiferroelectric phase transition proved by DTA test. The phase transition temperature lowers, while the real concentration of Mn increases, with the rate -15 K/%wt (Mn). The X-ray experimental spectrum remains in agreement with the spectrum generated for perovskite NaNbO3 when orthorhombic Pbcm space group was chosen for simulation. The evolution of lattice constant with Mn concentration was examined.

Keywords: sodium niobate, crystal structure, X-ray diffraction, DTA, precipitation


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