Structural, electric and dielectric properties of Eu-doped SrBi2Nb2O9 ceramics obtained by co-precipitation route

Abstract

This paper presents a study of the structure and dielectric properties of Eu-doped SrBi2Nb2O9 ceramics prepared by co-precipitation route and sintered at 850?C. The materials were examined using XRD and FTIR methods. XRD data indicated the formation of well crystallized structure of the pure and doped SrBi2Nb2O9, without the presence of undesirable phases. FTIR spectra do not bring a significant shift in the band positions. Moreover, the AC conductivity, dielectric constant and dielectric loss of the ceramics were determined through the frequency range [50 kHz-1MHz]. In particular, the dielectric constant (??) and dielectric losses (tan ?) of the SrBi2Nb2O9 and SrBi1.6Eu0.4Nb2O9 ceramics were measured as a function of temperature at various frequencies.

Lumino-structural properties of Dy3+ activated Na3Ba2LaNb10O30 phosphors with enhanced internal quantum yield for w-LEDs

“… 40 The shoulder in the region 1633 and 3432 cm −1 is because of water molecules. 41 The shoulder near 1743 cm −1 is contributed by C–O stretching mode in free carboxylic group. 42 The shoulder about 2921 cm −1 may correspond to the residual organic presence.…”

Energy transfer mechanisms and color-tunable luminescence of Tm3+/Tb3+/Eu3+ co-doped Sr4Nb2O9 phosphors for high-quality white light-emitting diodes

“…19 The peaks observed in the range of 1442 and 2989 cm −1 are associated with water molecules. 20 The disturbances in the form of peaks between 1000 to 3000 cm −1 may indicate the presence of residual organic compounds. 21 Furthermore, the absence of significant evidence of carbonates or carboxyl groups in the FT-IR spectra confirms the synthesis of phosphor materials from their precursor carbonates.…”

Structure and dielectric properties of Sm3+ modified Bi4Ti3O12- SrBi4Ti4O15 intergrowth ferroelectrics

“…The lattice parameters and orthorhombicity of SrBi 8 Ti 7 O 27 are also given in hybridization, the substitution of smaller ion Sm 3+ for Bi 3+ might cause changes in structural-distortion and ferroelectric properties [19][20][21][22]. The peak magnitude of (200) plane reflection (shown in Fig.…”

“…Based on the above Kroger-Vink notation, one can speculate that the double positive oxygen vacancy (V ′′ O ) can easily compensate with titanium ion and maintain the charge neutrality condition [22]. The complex defect dipoles such as Ti 3+ -V ′′ O and Ti 4+ -V ′′ O , play an important role in the conduction process at lower temperature.…”