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Details of Grant 

EPSRC Reference: GR/R77919/01
Title: Structure, bonding and properties of novel piezoactive perovskite ferroelectric relaxors
Principal Investigator: Thomas, Professor PA
Other Investigators:
Smith, Professor ME
Researcher Co-Investigators:
Project Partners:
Foreign Academic Institution University of Leeds
Department: Physics
Organisation: University of Warwick
Scheme: Standard Research (Pre-FEC)
Starts: 19 April 2002 Ends: 18 April 2005 Value (£): 213,870
EPSRC Research Topic Classifications:
Chemical Structure
EPSRC Industrial Sector Classifications:
No relevance to Underpinning Sectors Electronics
Related Grants:
GR/R77902/01
Panel History:  
Summary on Grant Application Form
This programme concerns studies of the structure and bonding in two novel peroskite relaxor series, lead magnesium niobate-lead titanate (PMN-PT) and sodium potassium bismuth titanate (NKBT). These materials are united by exhibiting ferroelectric relaxor behaviour which is associated with phase transitions involving large structural and symmetry changes and unusual local structures, particularly compositional and positional disorder. Both series are of considerable interest as new piezoelectrics with PMN-PT showing giant piezoactivity and NKBT offering lead-free material for biological piezo-applications. The overall aims of the programme are: 1) To combine studies of average and local crystal structure and optical properties as a function of both pressure and temperature to advance the understanding of the structural origins of ferroelectric relaxor behaviour in the PMN-PT and NKBT systems; 2) To understand from the basis of average and local structure, how the addition of PT to PMN produces the crossover from relaxor to normal ferroelectric behaviour. 3) To determine the nature of the morphotropic phase boundaries in the B-site substituted perovskite series PMN-PT and the A-site substituted series NKBT. 4) To understand the occurence and formation of the morphotropic phase boundaries as in terms of the local structure in both cases; 5) To understand the structural origin of the high piezoactivity exhibited by the PMN-PT series and establish the composition producing enhanced piezoactivity in NKBT; 5) To explore the role of applied pressure as a determinant of ferroelectric relaxor behaviour.
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Organisation Website: http://www.warwick.ac.uk