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You searched for subject:(Zirconates). Showing records 1 – 3 of 3 total matches.

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University of Florida

1. Seshadri, Shruti B. Investigation of Piezoelectric Softening Mechanisms in Lead Zirconate Titanate Using Diffraction and Property Measurements.

Degree: PhD, Materials Science and Engineering, 2012, University of Florida

Lead zirconate titanate (PZT) is a well-known piezoelectric ceramic of commercial and scientific importance. Typically, PZT is used in its doped form as doping allows its properties to be tailored for specific applications. Donor doping turns PZT into a "soft" ferroelectric.One of the characteristics of soft ferroelectrics is an increase in their longitudinal piezoelectric coefficient. Softening is currently attributed to an increase in the concentration of lead vacancies and the associated effect on the behavior of ferroelectric domain walls. However, the exact mechanism by which donor doping enhances the longitudinal piezoelectric coefficient is still not understood. In this work, the crystallographic response of donor-doped PZT is studied in situ during the application of electric fields in order to deduce the strain mechanisms which contribute to ferroelectric softening. X-ray diffraction from a synchrotron source is employed for this investigation. It was found that the use of different donor dopants results in distinctive, characteristic strain mechanisms that soften PZT. Sm and Nd aid in the softening of PZT solely by enhancing 90° domain wall mobility. However, La and Nb doping results in a material with coexisting ferroelectric phases. It was further found that Nb doping results in at least two additional strain mechanisms including interphase boundary motion and alarge strain in the (200) rhombohedral lattice plane. As piezoelectrics are also used in high temperature applications, the temperature dependence of the piezoelectric coefficient in soft doped PZT was also investigated. It was found that Sm doping leads to a high temperature (˜ 300°C)piezoelectric coefficient that is substantially greater than that found in La and Nb-doped PZT. In some cases, the coefficient in Sm-doped PZT is greater than that of La and Nd-doped PZT by a factor of two. Conventionally, the largest piezoelectric coefficient values are obtained in soft doped PZT by using a Zr:Ti ratio close to the morphotropic phase boundary (MPB). It is shown that in Sm-doped PZT, enhanced high temperature piezoelectric coefficients can also be obtained at compositions far from the MPB due to the presence of a mixed tetragonal and cubic phase. The mixed phase is hypothesized to enable a larger extrinsic piezoelectric response in Sm doped PZT due to enhanced strain accommodation in the coexisting polymorphic phases.  In summary, it is presented that dopants yield signature,qualitative softening mechanisms, contributing differently to high piezoelectricity in PZT. The results suggest that in contrast to prior-held assumptions, an increase in Pb vacancies is not a necessary criterion for softening. ( en ) Advisors/Committee Members: Jones, Jacob L. (committee chair), Hummel, R. E (committee member), Andrew, Jennifer (committee member), Hess, Henry (committee member), Nishida, Toshikazu (committee member).

Subjects/Keywords: Ceramic materials; Dielectric materials; Domain walls; Doping; Electric fields; Electrical phases; High temperature; Temperature dependence; Wave diffraction; Zirconates; diffraction  – lead  – piezoelectric  – softening  – titanate  – zirconate

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Seshadri, S. B. (2012). Investigation of Piezoelectric Softening Mechanisms in Lead Zirconate Titanate Using Diffraction and Property Measurements. (Doctoral Dissertation). University of Florida. Retrieved from http://ufdc.ufl.edu/UFE0045009

Chicago Manual of Style (16th Edition):

Seshadri, Shruti B. “Investigation of Piezoelectric Softening Mechanisms in Lead Zirconate Titanate Using Diffraction and Property Measurements.” 2012. Doctoral Dissertation, University of Florida. Accessed October 19, 2019. http://ufdc.ufl.edu/UFE0045009.

MLA Handbook (7th Edition):

Seshadri, Shruti B. “Investigation of Piezoelectric Softening Mechanisms in Lead Zirconate Titanate Using Diffraction and Property Measurements.” 2012. Web. 19 Oct 2019.

Vancouver:

Seshadri SB. Investigation of Piezoelectric Softening Mechanisms in Lead Zirconate Titanate Using Diffraction and Property Measurements. [Internet] [Doctoral dissertation]. University of Florida; 2012. [cited 2019 Oct 19]. Available from: http://ufdc.ufl.edu/UFE0045009.

Council of Science Editors:

Seshadri SB. Investigation of Piezoelectric Softening Mechanisms in Lead Zirconate Titanate Using Diffraction and Property Measurements. [Doctoral Dissertation]. University of Florida; 2012. Available from: http://ufdc.ufl.edu/UFE0045009


ETH Zürich

2. Sticher, Hans. Abbau von Silikaten mit Brenzkatechin.

Degree: 1963, ETH Zürich

Subjects/Keywords: SILIKATE UND SILICIUMDIOXID (ANORGANISCHE CHEMIE); SILIKATE + TITANATE + ZIRKONIATE + STANNATE + THORATE (MINERALOGIE); DIHYDROXYBENZOLE (MONOCYCLISCHE AROMATISCHE KOHLENWASSERSTOFFE); SILICATES AND SILICON DIOXIDE (INORGANIC CHEMISTRY); SILICATES + TITANATES + ZIRCONATES + STANNATES + THORATES (MINERALOGY); DIHYDROXYBENZENES (MONOCYCLIC AROMATIC HYDROCARBONS); info:eu-repo/classification/ddc/540; Chemistry

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Sticher, H. (1963). Abbau von Silikaten mit Brenzkatechin. (Doctoral Dissertation). ETH Zürich. Retrieved from http://hdl.handle.net/20.500.11850/131862

Chicago Manual of Style (16th Edition):

Sticher, Hans. “Abbau von Silikaten mit Brenzkatechin.” 1963. Doctoral Dissertation, ETH Zürich. Accessed October 19, 2019. http://hdl.handle.net/20.500.11850/131862.

MLA Handbook (7th Edition):

Sticher, Hans. “Abbau von Silikaten mit Brenzkatechin.” 1963. Web. 19 Oct 2019.

Vancouver:

Sticher H. Abbau von Silikaten mit Brenzkatechin. [Internet] [Doctoral dissertation]. ETH Zürich; 1963. [cited 2019 Oct 19]. Available from: http://hdl.handle.net/20.500.11850/131862.

Council of Science Editors:

Sticher H. Abbau von Silikaten mit Brenzkatechin. [Doctoral Dissertation]. ETH Zürich; 1963. Available from: http://hdl.handle.net/20.500.11850/131862


ETH Zürich

3. Müller, Moritz. Bodenbildung auf Silikatunterlage in der alpinen Stufe des Oberengadins.

Degree: 1983, ETH Zürich

Subjects/Keywords: BIOLOGISCHE BODENANALYSE + BODENBIOLOGISCHE METHODIK (PEDOLOGIE); OBERENGADIN, KREIS (KANTON GRAUBÜNDEN); SILIKATE + TITANATE + ZIRKONIATE + STANNATE + THORATE (MINERALOGIE); BIOLOGICAL SOIL ANALYSIS + SOIL-BIOLOGICAL METHODS (PEDOLOGY); UPPER ENGADINE, SUB-DISTRICT (CANTON OF GRISONS); SILICATES + TITANATES + ZIRCONATES + STANNATES + THORATES (MINERALOGY); info:eu-repo/classification/ddc/630; Agriculture

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Müller, M. (1983). Bodenbildung auf Silikatunterlage in der alpinen Stufe des Oberengadins. (Doctoral Dissertation). ETH Zürich. Retrieved from http://hdl.handle.net/20.500.11850/137860

Chicago Manual of Style (16th Edition):

Müller, Moritz. “Bodenbildung auf Silikatunterlage in der alpinen Stufe des Oberengadins.” 1983. Doctoral Dissertation, ETH Zürich. Accessed October 19, 2019. http://hdl.handle.net/20.500.11850/137860.

MLA Handbook (7th Edition):

Müller, Moritz. “Bodenbildung auf Silikatunterlage in der alpinen Stufe des Oberengadins.” 1983. Web. 19 Oct 2019.

Vancouver:

Müller M. Bodenbildung auf Silikatunterlage in der alpinen Stufe des Oberengadins. [Internet] [Doctoral dissertation]. ETH Zürich; 1983. [cited 2019 Oct 19]. Available from: http://hdl.handle.net/20.500.11850/137860.

Council of Science Editors:

Müller M. Bodenbildung auf Silikatunterlage in der alpinen Stufe des Oberengadins. [Doctoral Dissertation]. ETH Zürich; 1983. Available from: http://hdl.handle.net/20.500.11850/137860

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