David hermine

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Brown-caceres, Nicholas A/ Plylar, David HBiblio.com

Let the People Hear It – One Hundred Years of Concerts at the Library of Congress

Lee, Moo Y, and Montgomery, Stephen T, and Hofer, John H, and Zeuch, David HBiblio.com

Hydrostatic Uniaxial and Triaxial Compression Tests on Unpoled "Chem-prep" PZT 95/5-2Nb Ceramic Within Temperature Range of -55 to 75o C; SAND2003-3651

200381066Albuquerque NM: Sandia National Laboratories 2003. Presumed First Edition First printing. Velobound. Very good. x 74 pages plus covers. Tables. Figures some with color. References Appendices A. - D. Rear cover has mailing label and ink notation. Sandia is currently developing a lead-zirconate-titanate ceramic 95/5-2Nb or PNZT from chemically prepared "chem-prep" precursor powders. Previous PNZT ceramic was fabricated from the powders prepared using a "mixed-oxide" process. The specimens of unpoled PNZT ceramic from batch HF803 were tested under hydrostatic uniaxial and constant stress difference loading conditions within the temperature range of -55 to 75°C and pressures to 500 MPa. The objective of this experimental study was to obtain mechanical properties and phase relationships so that the grain-scale modeling effort can develop and test its models and codes using realistic parameters. The stress-strain behavior of "chem-prep" PNZT under different loading paths was found to be similar to that of "mixed-oxide" PNZT.<br/>The phase transformation from ferroelectric to antiferroelectric occurs in unpoled ceramic with abrupt increase in volumetric strain of about 0.7 % when the maximum compressive stress regardless of loading paths equals the hydrostatic pressure at which the<br/>transformation otherwise takes place. The stress-volumetric strain relationship of the ceramic undergoing a phase transformation was analyzed quantitatively using a linear regression analysis. The pressure PT1 H required for the onset of phase transformation with<br/>respect to temperature is represented by the best-fit line PT1 H MPa = 227 0.76 T °C. We also confirmed that increasing shear stress lowers the mean stress and the volumetric strain required to trigger phase transformation. At the lower bound -55°C of the tested<br/>temperature range the phase transformation is permanent and irreversible. However at the upper bound 75°C the phase transformation is completely reversible as the stress causing phase transformation is removed. Sandia National Laboratories unknown

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