Cover Page April-2012-Advanced Materials Letters

Advanced Materials Letters

Volume 3, Issue 2, Pages 118-125, April 2012
About Cover

Citrate–nitrate Derived Sr0.5Ba0.5Ta2O6 Tetragonal Tungsten Bronze Nanorods: Investigation Of Their Optical And Dielectric Properties

Yogesh Kumar Sharma1*, Krishna Kumar2, Chandrashekhar Sharma3, R. Nagarajan1

1Materials Chemistry Group, Department of Chemistry, University of Delhi, Delhi 110007, India

2Department of Physics and Astrophysics, University of Delhi, Delhi 110007, India

3Central Institute of Plastics Engineering and Technology, Lucknow 226 008, India

Adv. Mater. Lett., 2012, 3 (2), pp 118-125

DOI: 10.5185/amlett.2011.6278

Publication Date (Web): Apr 14, 2012



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 (ε') 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 (ε) 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.


Nanostructures, ceramics, sol-gel growth, X-ray scattering, dielectric properties

Previous issues

Current Global Scenario of Electric Vehicles

Review on Detection of Phenol in Water 

Investigating the Machinability of Metallic Matrix Composites Reinforced by Carbon Nanotubes: A Review

Photocatalytic ZnO based PES Membranes for AOP Water Treatments under UV and Sunlight

Plasma Activated Water as a Source of Nitrogen for Algae Growth

Digital Light Processing (DLP) 3D Printing of Polyethylene Glycol (PEG) Biopolymer, Commercially available Ultra-High and Tough (UHT) Resin and Maghemite (γ-Fe2O3) Nanoparticles Mixture for Tissue Engineering Scaffold Application

Fabrication of Nanoparticle Embedded Polymeric Microbeads as an Efficient Drug Delivery System

Micro/Nanostructured Papers from Bagasse Pulp Reinforced by Nanofibrillated Cellulose from different Agro-Waste Sources

Structural, Optical and Magnetic Properties of Pristine, (Mn, Al) co-doped ZnO Nanocrystallites Synthesized via co-Precipitation Method

Nanosecond Laser Surface Patterning of Ti6Al4V Bio-alloy for Improved Biological Performance

Synthesis of Cu2O/Ag Composite Nanocubes with Promising Photoluminescence and Photodegradation Activity over Methylene Blue Dye

Locally available Clays of Bangladesh as a Replacement of imported Clays for Ceramic Industries 

Green Synthesis and Characterization of Silver Nanoparticles using Cassia auriculata Leaves Extract and Its Efficacy as A Potential Antibacterial and Cytotoxic Effect

Upcoming Congress

Knowledge Experience at Sea TM