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ISRN Nanomaterials
Volume 2012 (2012), Article ID 687641, 7 pages
http://dx.doi.org/10.5402/2012/687641
Research Article

Structure and Composition of Ba-W-Ti-O Ceramics Interface Regions Formed at Ultrasonic Vibration

1Physical-Technical Institute UB RAS, 132 Kirov Straße, Izhevsk 426000, Russia
2Kotelnikov Institute of Radio Engineering and Electronics, RAS, 11 Mokhovaya Straße, Korp. 7, Moscow 125009, Russia
3Scientific-Educational Nano-Center, Tomsk Polytechnic University, 30 Lenin Avenue, Tomsk 634050, Russia

Received 2 April 2012; Accepted 29 April 2012

Academic Editors: C. Angeles-Chavez, G. Speranza, and V. Yamakov

Copyright © 2012 O. Karban et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The study of Ba-W-Ti-O ceramics has shown that the structure and composition of their interface regions differ from those in the grain bulk owing to the diffusion of tungsten atoms to the grain surface during sintering. They are determined by the conditions of compacting of dry nanopowders (compaction pressure and power of ultrasonic action) and vary in a nonmonotonic way. Increasing the pressure during dry static compacting and exposure to ultrasound result in the formation of a complex structure of fragments and boundaries between them, increasing the acoustic density and decreasing the intergranular boundary thickness. This affects the travel time of the phonon pulse through the sample, which allows one to determine the density and thickness of the grain boundaries by the method of phonon spectroscopy.