SYNTHESIS AND DIELECTRIC PROPERTIES OF FOUR-LAYERED AURIVILLIUS SrBi4Ti4O15 DOPED Nd3+ AND Mn4+

Abstract

Synthesis of four-layered Aurivillius compound doped with Nd³⁺ and Mn⁴⁺ cations, SrBi_3.5Nd_0.5Ti_4-xMn_xO₁₅ (x = 0; 0.5; 1) was carried out using molten salt method with a mixture of Na₂SO₄/K₂SO₄ as a flux. The synthesized products were characterized using X-ray diffraction (XRD) and refined by Le Bail technique. The results of XRD analysis show that the four-layered Aurivillius compound formed, however there are additional peaks identified as perovskite and Bi_7.68Ti_0.32O_12.16  phases for x = 0 and perovskite and Sr₄Ti₃O₁₀phases for x = 0.5 and 1. The results of refinement show that four-layered Aurivillius phase formed has orthorhombic symmetry with A2₁am space group. Scanning Electron Microscopy (SEM) shows the plate like morphology that are characteristic of Aurivillius compound. Dielectric constant of the samples show increasing value as increasing of Mn⁴⁺ concentration.