Structure and ferroelectric property of Nb-doped SrBi4Ti4O15 ceramics

Abstract

Nb-doped SrBi 4 Ti 4 O 15 (SBT) was produced by conventional method. Structural and ferroelectric properties of SBT were examined as a function of niobium composition. Analyzing the structure futures of SBT by XRD, XPS and Raman spectrum, Nb 5+ substituted Ti 4+ to form NbO 6 octahedron and did not change the structure of SBT. The XRD patterns indicated the formation of the single phase of SBT for x=0.01and 0.03 and secondary phase of Sr 3 Ti 2 O 7 appeared when x>0.1. To compare the effect of Nb doping, the ferroelectric properties (hysteresis loop, piezoelectric coefficient) of Nb-doped SBT were measured. The SBT doped with x=0.15 was found to exhibit higher remanent polarization with d 33 =17 pC/N.

Piezoelectric Materials for High Temperature Sensors

“…General observations of various ferroelectric polycrystalline ceramics as a function of Curie point are summarized in Fig. , where one can see the values of dielectric permittivity and piezoelectric coefficients decrease with increasing T C temperatures . In contrast to polycrystalline ceramics, the dielectric and piezoelectric properties of single crystals, e.g., perovskite relaxor‐PT crystals, were found to be associated with their respective rhombohedral to tetragonal ferroelectric phase transition temperatures, a consequence of the strongly curved MPB, as shown in Figs.…”

“…The general formula for bismuth‐layer‐structured ferroelectrics (BLSFs) is (Bi 2 O 2 ) 2+ (A m − 1 B m O 3 m + 1 ) 2‐ , where A is a mono‐, di‐ or trivalent ion or a mixture of the three allowing dodecahedral coordination, B is a combination of cations well suited for octahedral coordination, and m is the number of octahedral layers in the perovskite slab, which ranges from 1 to 6, such as Bi 4 Ti 3 O 12 , SrBi 2 Nb 2 O 9 , CaBi 2 Nb 2 O 9 , Bi 3 TiNbO 9 , CaBi 4 Ti 4 O 15 , SrBi 4 Ti 4 O 15 , etc. In fact, the m value can also be fractional, as in Na 0.5 Bi 4.5 Ti 4 O 15 and K 0.5 Bi 4.5 Ti 4 O 15 compounds . The BLSF family of piezoelectrics presents low dielectric permittivities, low aging rates, strong anisotropic electromechanical properties, high mechanical quality factors, and high Curie points, and thus is a promising candidate for high temperature sensor applications.…”

Effect of CuO modification on dielectric, ferroelectric and piezoelectric properties of lead-free SrBi4Ti4O15 ceramics

“…For improving the properties of SBTi, researchers have been studied the effect of doping in various site of SBTi with different metal ions. Reports are available with lanthanum [4], praseodymium [5], erbium [6] barium [2] calcium [7], zirconium [8] niobium [9][10][11], vanadium [12], cobalt [13], tungsten [14], and molybdenum [10] doped SBTi systems.…”

P-E STUDIES OF Nd MODIFIED SrBi4Ti4O15 CERAMICS

“…Usually, m is an integer and varies between 1 and 5. 6 The material SrBi4Ti4O15 (SBT) exhibits excellent electrical properties 7. Many researchers have studied SBT, a BLSF with m=4 [8][9][10][11] . In the present work, dielectric properties of Rare-Earth doped ceramics Sr0.8Nd0.2Bi4Ti4O15 (SN0.2BT) prepared via solidstate reaction method are reported.…”