David hermine

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keller, david hBiblio.com

THE SIGN OF THE BURNING HART .

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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David hermine

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