Structural characterization of 0.5PbMg1/3Nb2/3O3–0.5BaxPb(1−x)TiO3 powders

Effects of addition of BT on structural phase formation and electrical properties of relaxor ferroelectric Pb(In0.5Nb0.5)(1−x)Ti(x)O3 ceramics

“…Additionally, it is also indicated that the addition of BT induces a shift of the MPB in the PINT system. Similar shift of the MPB has been reported in other systems such as PMN-PT and PZN-PT [13,22,23]. Fig.…”

Crystal structure, photocatalytic and dielectric property of ATiM2O8 (A: Mg, Zn; M: Nb, Ta)

“…The interatomic distances of (Mg,Ti,Nb)-O are 1.990(1) and 2.037(3)Å. These values agree with those (1.986 and 2.004Å) measured in rutile-type Mg 0.167 Nb 0.333 Ti 0.5 O 2[7]. In the system TiO 2 -Zn 1/3 Nb 2/3 O 2 there are three types of crystal structures: a rutile-, an α-PbO 2 -and a columbitetypes structure[9].…”

“…The lattice parameters (a = 4.69585 (8) and c = 3.04260(6) Å) of MgTiNb 2 O 8 with a rutile-type structure were slightly longer than those (a = 4.662 (1) and c = 3.016(3) Å) of Mg 0.167 Nb 0.333 Ti 0.5 O 2 [7]. This is because the content of Nb, having the largest ionic radius among the component elements, in with a trirutile-type structure exhibited a small amount of photocatalytic activity for phenol degradation under UV light irradiation [6].…”

“…The crystal structure refinements for tantalates from the synchrotron X-ray powder diffraction data also gave the reasonable R-factors: R wp = 9.03% and R p = 6.31% for MgTiTa 2 O 8 and R wp = 5.70% and R p = 4.16% for ZnTiTa 2 O 8 . Their lattice parameters were a = 4.6876 (2) and c = 9.1385(3) Å for MgTiNb 2 O 8 and a = 4.6987 (7) and c = 9.1296(1) Å for ZnTiTa 2 O 8 . Figure 3 shows the Rietveld refinement patterns of SXRD for ATiM 2 O 8 (A: Mg, Zn; M: Nb, Ta).…”

“…In addition, the dielectric constants for four end members, NiTiNb 2 O 8 , CoTiNb 2 O 8 , NiTiTa 2 O 8 and CoTiTa 2 O 8 were between 25 and 75 at a temperature range of room temperature to 300°C. On the other hand, the solid solution systems M 2+ /Ti 4+ /M 5+ /O (M 2+ : Mg, Zn; M 5+ : Nb, Ta), where the transitionmetals were substituted with either magnesium or zinc atom, had been reported to have four types of crystal structures as follows: Mg 0.167 Nb 0.333 Ti 0.5 O 2 with a rutile-type structure [7], (Mg 0.857 Ti 0.143 ) (Nb 0.857 Ti 0.143 ) 2 O 6 , with a columbite-type structure [8], ZnTiNb 2 O 8 with the α-PbO 2 -type structure [9], (Zn 0.15 Nb 0.3 Ti 0.55 )O 2 with a rutile-type structure [10] and Zn/Ti/Ta/O system with a spinel-type structure [11,12]. The dielectric behaviors of ATiM 2 O 8 (A: Mg, Zn; M: Nb, Ta) were reported to be a candidate for a microwave capacitor and sol-gel process or a sintering additive for these compounds was attempted to improve their property [13][14][15][16][17].…”