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NMR Studies of the T1z Relaxation Times of the PMSN Ferroelectric

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Author: Palamara, Joseph
Advisor: Hoatson, Gina L.
Committee Members: Vold, Robert; Averett, Todd D.; Perdrisat, Charles
Issued Date: 5/8/2011
Subjects: Nuclear Magnetic Resonance
Ferroelectricity
URI: http://hdl.handle.net/10288/13667
Description: 93Nb MAS studies in the solid solution Lead Magnesium Scandium Niobate (xPMSN)have been performed to probe the microscopic nature of relaxor ferroelectricity. Using the x=0.6 concentration of PMSN, saturation recovery pulse sequence experiments were performed at various temperatures to study the longitudinal relaxation times in the system. A series of both one dimensional and two dimensional experiments were used to probe the system to determine specific features, in particular relaxation times T1z. Using the one dimensional single quantum experiments, the four largest peaks in the spectrum were analyzed, and it was seen that there is little temperature dependence in the frequencies of the peaks, but significant temperature dependence in their relaxation times T1z. Looking at these temperature dependences allows us to conclude that the relaxor behavior is significantly dependent on the local dynamics of the ions in the crystal units. The two dimensional triple quantum MAS experiments were performed in an attempt to improve spectral resolution, allowing us to look at the behavior of a wider peak that could not be clearly resolved in 1D spectral analysis. With the decreased signal to noise in the 2D spectra, only two peaks could be analyzed with statistical confidence. However, it was seen that these peaks were significantly separated and longer and more accurate relaxation times were obtained at 300 Kelvin.
Degree: Bachelors of Science in Physics


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