Abstract
First time novel complex strontium barium tantalate, Sr0.5Ba0.5Ta2O6 was successfully synthesized in 1D structure (nanorods) by citrate-nitrate gel route. Their structural properties were examined via X-ray diffractometry (XRD) and revealed the formation of tetragonal tungsten bronze (TTB) structure at as low as 1100oC. Also, FT-IR, FT-Raman, UV-vis, SEM, TEM and PL were used to identify the structure and properties of powders. Well isolated nanorods of the average diameter of ~200nm can be fabricated by this route. PL spectrum showed strong and broad visible emission band around 439nm due to particles with little surface defects. The frequency dependent dielectric dispersion of SBT50 powders sintered at 1300°C/4 h was investigated in a frequency range from 1 kHz-1MHz and at different temperatures (25°C- 450°C). It is observed that: (i) the dielectric constant (e') and loss tangent (tan δ) are dependent on frequency, (ii) the temperature of dielectric constant maximum shift toward lower temperature side and the maximum dielectric constant (e) was observed to be 2400 at 1 kHz. The Tc was found to be ~444- 449°C and ferroelectric relaxor or diffuse phase transition like behavior was observed at around 449°C. Copyright © 2012 VBRI Press.
Highlights
ExperimentalA growing interest in recent years can be seen for the synthesis of functional materials in low-dimensional nanostructures, including nanoparticles, quantum dots, nanotubes, nanowires, nanorods, nanobelts and nanosheets, because of their novel physical and chemical properties vary significantly from their bulky counterparts [1,2]
We investigate the simple and template free synthetic approach for non volatile lead-free tungsten bronze (TTB)
A facile citrate-nitrate gel approach was adopted for Sr0.5Ba0.5Ta2O6 (SBT50) ceramics and the obtained powders consist fine nanorods like morphology
Summary
ExperimentalA growing interest in recent years can be seen for the synthesis of functional materials in low-dimensional nanostructures, including nanoparticles, quantum dots (zero dimension, 0 D), nanotubes, nanowires, nanorods, nanobelts (one dimension, 1 D) and nanosheets (two dimension, 2 D), because of their novel physical and chemical properties vary significantly from their bulky counterparts [1,2]. Jamieson et al [8] and Neurgaonkar et al [9] reported a detailed study on SBN, BNN and KLN for various structural revelations and exploitation for applications of TTB compounds. These materials are very promising for electroceramic applications and many researchers have shown considerable interest in the dielectric properties of such compounds. These compounds show high Curie temperature which makes their efficiency of working at higher temperatures in transducers and detectors, their performances were found comparable to generally used perovskites such as PZT ceramics [10]. Sakamoto et al did complete studies on similar materials and concluded that crystallization in tungsten-bronze usually requires high crystallization temperature [22]
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