Quasi-rapid thermal annealing studies on barium strontium titanate thin films deposited on fused silica substrates
authors Saravanan, KV; Raju, KCJ
nationality International
journal JOURNAL OF ALLOYS AND COMPOUNDS
author keywords Barium strontium titanate; Quasi-rapid thermal annealing; Amorphous-crystalline transition; Optical properties; Microwave dielectric response; Split-post dielectric resonator technique
keywords MICROWAVE DIELECTRIC-PROPERTIES; WAVE-GUIDE; PERMITTIVITY MEASUREMENTS; OPTICAL PROPERTIES; THICKNESS; FABRICATION; RESONATOR; CONSTANTS; ELECTRODE
abstract Thin films of (Ba-0.5, Sr-0.5) TiO3 (BST5) were deposited at ambient temperature on fused silica substrates by RF magnetron sputtering technique. Nano-crystalline films were obtained upon quasi-rapid thermal annealing (Q-RTA) at temperatures >= 800 degrees C for 60 s. The influence of Q-RTA temperature on the structural, morphological, optical and microwave dielectric properties of BST5 thin films have been investigated. The as-deposited and Q-RTA films annealed up to 700 degrees C were amorphous in nature. On increasing the Q-RTA temperature to 800 degrees C and above resulted in an amorphous-crystalline phase transition in the films. All the crystalline films show similar full width at half maxima (FWHM) and hence, similar crystallite size of about 12 +/- 1 nm. The amorphous-crystalline transition was accompanied by a decrease in the optical band gap from 4.5 to 3.6 and increase in the refractive index from 1.9 to 2.2 as well as in the microwave dielectric constant from 40 to 262. The Root Mean Square roughness (RMSroughness) as measured from AFM show an increase from 0.6 nm to 5.6 nm with an increase in Q-RTA temperature from 400 degrees C to 1000 degrees C. (C) 2013 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE SA
issn 0925-8388
year published 2013
volume 571
beginning page 43
ending page 49
digital object identifier (doi) 10.1016/j.jallcom.2013.03.117
web of science category Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering
subject category Chemistry; Materials Science; Metallurgy & Metallurgical Engineering
unique article identifier WOS:000319209500008
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