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

Edité par Sandia National Laboratories, Albuquerque, NM, 2003

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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. 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 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 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 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.…

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Détails bibliographiques

Titre
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
Auteur
Lee, Moo Y., and Montgomery, Stephen T., and Hofer, John H., and Zeuch, David H.
Éditeur
Sandia National Laboratories, Albuquerque, NM
Année de publication
2003
État de l'article
Very good
Reliure
Velobound
Édition
Presumed First Edition, First printing.

Ground Zero Books, Ltd.

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