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Structure of NaNbO 3 : xMn Single Crystals at Room Temperature
Author(s) -
Molak A.,
Kubacki J.
Publication year - 2001
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/1521-4079(200110)36:8/10<893::aid-crat893>3.0.co;2-#
Subject(s) - crystallography , materials science , mineralogy , chemistry
A series of NaNbO 3 : 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 NaNbO 3 when orthorhombic Pbcm space group was chosen for simulation. The evolution of lattice constant with Mn concentration was examined.