Temperature dependence of lattice parameters of SBN single crystals in the vicinity of their structural phase transitions

Abstract

Changes of lattice parameters of Sr x Ba 1-x Nb 2 O 6 (0.35 < x < 0.72) solid solution single crystals were measured as a function of temperature. The X-ray Bond' method was used to carry out very precise measurements of the lattice parameters. Fine correlations between values of the lattice parameter and the Sr concentration in the solid solution of Sr x Ba 1-x Nb 2 O 6 single crystals are found. A conventional analysis of lattice parameter data in terms of spontaneous strain and strain/order parameter coupling shows that a normal structural phase transition does occur. While the ferroelectric system (SBN26) displays a nearly tricritical behavior, β ≈ 0.20, the relaxor one (SBN61) complies with the two-dimensional Ising-model-like criticality, β ≈ 0.17.

Dynamics of Nanoscale Polarization Fluctuations in a Uniaxial Relaxor

“…1(b). The pronounced broad maximum near the transition temperature [57] T C ¼ 346 K, with a shape similar to that of the temperature dependence of dielectric permittivity [see Fig. 1(a)], testifies that the diffuse scattering intensity detected in our experiment contains a significant contribution of the OPF diffuse scattering component.…”

Pressure evolution of luminescence in Sr Ba1−(NbO2)3:Pr3+ (x=1/2 and 1/3)

“…In the case of Sr 0.33 Ba 0.66 Nb 2 O 6 and Sr 0.5 Ba 0.5 Nb 2 O 6 the Curie temperatures at ambient pressure are 430 K and 380 K, respectively [1,17] and at pressure 50 kbar the Curie temperature is 7 K for Sr 0.6 Ba 0.4 Nb 2 O 6 [6]. We consider that for room temperature the phase transition takes place at pressure much lower than 50 kbar.…”

Crystal Structure of the High Temperature Phase of Strontium Barium Niobate

“…Accurate temperature measurements of the lattice parameters allowed to determine the phase transition temperature [10]. The temperature was confirmed in measurements of electric susceptibility as a function of temperature and frequency [2].…”