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Details of Grant 

EPSRC Reference: GR/R30174/01
Title: Structure Property Relations In SrTiO3-Sr2Nb2O7 Microwave Dielectric Resonators
Principal Investigator: Reaney, Professor IM
Other Investigators:
Researcher Co-Investigators:
Project Partners:
Department: Materials Science and Engineering
Organisation: University of Sheffield
Scheme: ROPA
Starts: 29 August 2001 Ends: 28 August 2003 Value (£): 93,472
EPSRC Research Topic Classifications:
Materials Characterisation Materials Synthesis & Growth
EPSRC Industrial Sector Classifications:
Communications
Related Grants:
Panel History:  
Summary on Grant Application Form
SrTi03-Sr2Nb2O7 (STN) compounds are composed of perovskite units (n=4-6) separated and sheared by 1/2[111] on (110) planes by SrO layers. The processing, properties and microstructure of STN will be studied for potential use as microwave ceramics. Although relative permittivities and quality factors have not been measured, high values, 60-90 and 15,000 at 1GHz, respectively, are expected since the compounds are composed of (Ti,Nb)06 octahedra. The temperature coefficient of resonant frequency (TCF) will be systematically varied by altering the SrTiO3-Sr2Nb20, ratio since this will affect the tolerance factor and the number of Sr0 layers r unit volume: two factors recentl shown to control TCF.
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Organisation Website: http://www.shef.ac.uk