NaNbO₃-Based Relaxor

Studies of Magnetic and Ferroelectric Phase Transitions in BiFeO3-NaNbO3 Solid Solution Ceramics

“…Indeed, several phase transitions have been reported to occur between room temperature and 850 • C [8]. A similar behaviour is known for other Bi-containing perovskite oxide Na 0.5 Bi 0.5 TiO 3 where ferroelectric phase transition occurs at ≈200 • C while antiferroelectric one takes place at ≈300 • C. These considerations are supported by the fact that NaNbO 3 -Na 0.5 Bi 0.5 TiO 3 solid solution system belongs to the group II [6,7]. At room temperature Mössbauer spectra of BiFeO 3 as well as compositions witn x < 0.3 are sextets, while the spectrum of composition with x ≤ 0.5 is a doublet (Fig.…”

“…Such type of a T m (x) dependence and dielectric behaviour are characteristic of the so-called group II of NaNbO 3 -based solid solutions [6,7]. According to the existing criteria [6,7] the second component of the binary NaNbO 3 -ABO 3 solid solutions belonging to the group II should be either antiferroelectric or paraelectric with tolerance factor t < 0.99. As was already mentioned BiFeO 3 is known to be a ferroelectric and consequently BiFeO 3 -NaNbO 3 system should belong to the group I of the binary NaNbO 3 -ABO 3 solid solutions.…”

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].…”

Cole-Cole Analysis of a New Lead Free NaNbO3-Sr0.5NbO3-LiNbO3Ferroelectric Relaxor

“…Among the popular prototype perovskites for designing the lead-free relaxors are the compounds BaTiO 3 [9] and NaNbO 3 [10]. There is some evidence of the much greater role of lattice dynamics in lead-free relaxors and thus the phonon contribution to their properties as compared to their Pb-based counterparts [11,12].…”