New ferroelectric and relaxor ceramics in the mixed oxide system NaNbO3–BaSnO3

Microstructural, Raman and dielectric properties of (1−x)NaNbO3–xBiCrO3 biphase ceramics

“…In this work, a generally observed (1 1 1) peak is too weak to be noticed as belonging to the cubic perovskite. A similar phenomenon was also observed from the mixed oxide system NaNbO 3 -BaSnO 3 [14]. The formula for the pyrochlore phase can be regarded as (Bi δ Na γ )(Cr γ Nb δ )O 3 O y in which Bi 3+ (1.20Å) or Na + (1.18Å) ions occupy the A-sites of A 2 B 2 O 6 Otype pyrochlores and Cr 3+ (0.62Å) and Nb 5+ (0.64Å) ions occupy the B-sites.…”

Dielectric and Raman studies of Ba0.06(Na1/2Bi1/2)0.94TiO3–NaNbO3ceramics

“…Recently, the dielectric and relaxor behavior of BaTiO 3 -NaNbO 3 [20], A 0.5 Bi 0.5 TiO 3 -NaNbO 3 (A = Li, Na, K, Ag) [21], BaSnO 3 -NaNO 3 [22], Sr 0.5 NbO 3 -LiNbO 3 -NaNbO 3 [23], (Bi 0.5 Na 0.5 ) 0.94 Ba 0.06 (Ti 1 − 5x/4 Nb x )O 3 [24] and (Bi 0.5 Na 0.5 ) 0.935 Ba 0.065 Ti (1 − x) Nb x O 3 -0.01SrZrO 3 [25] ceramic solid solutions have been studied. Xu et al [26] have studied the phase transitions, formation enthalpies and implications for general perovskite energetics with special reference to SrTiO 3 -NaNbO 3 solid solution, while magnetic and ferroelectric phase transitions studies in BiFeO 3 -NaNbO 3 system were carried out by Raevski et al [27].…”

Structural and dielectric studies of relaxor ferroelectric Ba1−xLax(1−y)/2Euxy/2Nax/2TiO3 ceramics

“…As already shown, a linear variation of the ratio T m (f)/T m on log f should be derived from Vogel-Fülcher relation [30]:…”