{"id":{"repo_id":"mit","oai_identifier":"oai:dspace.mit.edu:1721.1/28621"},"canonical_url":"https://search.dev.ndltd.org/etd/mit/oai:dspace.mit.edu:1721.1/28621","repository":{"repo_id":"mit","name":"MIT","base_url":"https://dspace.mit.edu/oai/request"},"display":{"title":"Dielectric and electromechanical properties of barium and zirconium co-doped sodium bismuth titanate","abstract":"Compositional exploration was conducted within the alkaline bismuth titanate system by doping on the A- and B- sites with Ba⁺² and Zr⁺⁴, respectively. Results on the phase, dielectric and electromechanical properties of single crystals and polycrystals for this new family of relaxor perovskite ferroelectrics are presented. The actuation and polarization characteristics in this system were found to be highly sensitive (within 2 mol%) to cation doping levels, and tailored compositions successfully isolated predominantly electrostrictive actuation at room temperature. Ultra-high room temperature electrostriction was observed in co-doped (Ba + Zr) NBT polycrystals (NBT-14BT-4NBZ) and <100> single crystals (NBT-12BT-4NBZ), up to 0.24% and 0.45% strain, respectively, with negligible hysteresis at 0.05 Hz. Polycrystals with d₃₃ of up to 780 pC/N and single crystals with d₃₃ up to 2000 pC/N were measured. The low frequency actuation properties in the NBT-BT-NBZ compositions surpass highest reported values of strain and d₃₃ for polycrystalline PMN and PLZT and single crystal PMN conventional lead electrostrictors. Predominantly ferroelectric room temperature unipolar actuation in polycrystalline NBT-14BT-3NBZ at 0.05 Hz was observed to be linear and non-hysteretic, reaching up to 0.14% strain and d₃₃ of 310 pC/N at 60 kV/cm. These low frequency properties match the reported strain and d₃₃ values for conventional PZT-8, PMNT, and PZT-5a hard ferroelectrics and are more than double the reported values for polycrystalline NBT-BT (d₃₃ = 125 pC/N). Electrostrictive and ferroelectric compositions in the NBT-BT-NBZ system show the highest actuation strain and d₃₃ reported to date in any polycrystalline, lead-free composition.","abstract_html":"Compositional exploration was conducted within the alkaline bismuth titanate system by doping on the A- and B- sites with Ba⁺² and Zr⁺⁴, respectively. Results on the phase, dielectric and electromechanical properties of single crystals and polycrystals for this new family of relaxor perovskite ferroelectrics are presented. The actuation and polarization characteristics in this system were found to be highly sensitive (within 2 mol%) to cation doping levels, and tailored compositions successfully isolated predominantly electrostrictive actuation at room temperature. Ultra-high room temperature electrostriction was observed in co-doped (Ba + Zr) NBT polycrystals (NBT-14BT-4NBZ) and &lt;100&gt; single crystals (NBT-12BT-4NBZ), up to 0.24% and 0.45% strain, respectively, with negligible hysteresis at 0.05 Hz. Polycrystals with d₃₃ of up to 780 pC/N and single crystals with d₃₃ up to 2000 pC/N were measured. The low frequency actuation properties in the NBT-BT-NBZ compositions surpass highest reported values of strain and d₃₃ for polycrystalline PMN and PLZT and single crystal PMN conventional lead electrostrictors. Predominantly ferroelectric room temperature unipolar actuation in polycrystalline NBT-14BT-3NBZ at 0.05 Hz was observed to be linear and non-hysteretic, reaching up to 0.14% strain and d₃₃ of 310 pC/N at 60 kV/cm. These low frequency properties match the reported strain and d₃₃ values for conventional PZT-8, PMNT, and PZT-5a hard ferroelectrics and are more than double the reported values for polycrystalline NBT-BT (d₃₃ = 125 pC/N). Electrostrictive and ferroelectric compositions in the NBT-BT-NBZ system show the highest actuation strain and d₃₃ reported to date in any polycrystalline, lead-free composition.","abstract_has_math":false,"creators":["Sheets, Sossity A. (Sossity Amber), 1973-"],"institution":"Massachusetts Institute of Technology","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":"Massachusetts Institute of Technology. Dept. of Materials Science and Engineering.","school":null,"contributors":[],"advisors":["Yet-Ming Chiang."],"committee_chairs":[],"committee_members":[],"year":2000,"date_issued":"2000","date_published":"2000","updated_at":"2026-07-22T22:21:24Z","subjects":["Materials Science and Engineering."],"languages":["en_US"],"rights":["M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission."],"rights_urls":["http://dspace.mit.edu/handle/1721.1/7582"],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/1721.1/28621","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Yet-Ming Chiang."]},{"key":"dc:contributor.department","label":"Department","values":["Massachusetts Institute of Technology. Dept. of Materials Science and Engineering."]},{"key":"dc:contributor.other","label":"Dc Contributor Other","values":["Massachusetts Institute of Technology. Dept. of Materials Science and Engineering."]},{"key":"dc:creator","label":"Author","values":["Sheets, Sossity A. 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They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission."]},{"key":"dc:rights.uri","label":"Rights URI","values":["http://dspace.mit.edu/handle/1721.1/7582"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/1721.1/28621"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2000.","Includes bibliographical references (p. 175-179)."]},{"key":"dc:description.abstract","label":"Abstract","values":["Compositional exploration was conducted within the alkaline bismuth titanate system by doping on the A- and B- sites with Ba⁺² and Zr⁺⁴, respectively. Results on the phase, dielectric and electromechanical properties of single crystals and polycrystals for this new family of relaxor perovskite ferroelectrics are presented. The actuation and polarization characteristics in this system were found to be highly sensitive (within 2 mol%) to cation doping levels, and tailored compositions successfully isolated predominantly electrostrictive actuation at room temperature. Ultra-high room temperature electrostriction was observed in co-doped (Ba + Zr) NBT polycrystals (NBT-14BT-4NBZ) and <100> single crystals (NBT-12BT-4NBZ), up to 0.24% and 0.45% strain, respectively, with negligible hysteresis at 0.05 Hz. Polycrystals with d₃₃ of up to 780 pC/N and single crystals with d₃₃ up to 2000 pC/N were measured. The low frequency actuation properties in the NBT-BT-NBZ compositions surpass highest reported values of strain and d₃₃ for polycrystalline PMN and PLZT and single crystal PMN conventional lead electrostrictors. Predominantly ferroelectric room temperature unipolar actuation in polycrystalline NBT-14BT-3NBZ at 0.05 Hz was observed to be linear and non-hysteretic, reaching up to 0.14% strain and d₃₃ of 310 pC/N at 60 kV/cm. These low frequency properties match the reported strain and d₃₃ values for conventional PZT-8, PMNT, and PZT-5a hard ferroelectrics and are more than double the reported values for polycrystalline NBT-BT (d₃₃ = 125 pC/N). Electrostrictive and ferroelectric compositions in the NBT-BT-NBZ system show the highest actuation strain and d₃₃ reported to date in any polycrystalline, lead-free composition."]},{"key":"dc:description.degree","label":"Dc Description Degree","values":["S.M."]},{"key":"dc:format.mimetype","label":"Dc Format Mimetype","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Dielectric and electromechanical properties of barium and zirconium co-doped sodium bismuth titanate"]}]}],"canonical_facts":{"dc:contributor.advisor":["Yet-Ming Chiang."],"dc:contributor.department":["Massachusetts Institute of Technology. Dept. of Materials Science and Engineering."],"dc:contributor.other":["Massachusetts Institute of Technology. Dept. of Materials Science and Engineering."],"dc:creator":["Sheets, Sossity A. (Sossity Amber), 1973-"],"dc:date.accessioned":["2005-09-27T17:21:47Z"],"dc:date.available":["2005-09-27T17:21:47Z"],"dc:date.issued":["2000"],"dc:description":["Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2000.","Includes bibliographical references (p. 175-179)."],"dc:description.abstract":["Compositional exploration was conducted within the alkaline bismuth titanate system by doping on the A- and B- sites with Ba⁺² and Zr⁺⁴, respectively. Results on the phase, dielectric and electromechanical properties of single crystals and polycrystals for this new family of relaxor perovskite ferroelectrics are presented. The actuation and polarization characteristics in this system were found to be highly sensitive (within 2 mol%) to cation doping levels, and tailored compositions successfully isolated predominantly electrostrictive actuation at room temperature. Ultra-high room temperature electrostriction was observed in co-doped (Ba + Zr) NBT polycrystals (NBT-14BT-4NBZ) and <100> single crystals (NBT-12BT-4NBZ), up to 0.24% and 0.45% strain, respectively, with negligible hysteresis at 0.05 Hz. Polycrystals with d₃₃ of up to 780 pC/N and single crystals with d₃₃ up to 2000 pC/N were measured. The low frequency actuation properties in the NBT-BT-NBZ compositions surpass highest reported values of strain and d₃₃ for polycrystalline PMN and PLZT and single crystal PMN conventional lead electrostrictors. Predominantly ferroelectric room temperature unipolar actuation in polycrystalline NBT-14BT-3NBZ at 0.05 Hz was observed to be linear and non-hysteretic, reaching up to 0.14% strain and d₃₃ of 310 pC/N at 60 kV/cm. These low frequency properties match the reported strain and d₃₃ values for conventional PZT-8, PMNT, and PZT-5a hard ferroelectrics and are more than double the reported values for polycrystalline NBT-BT (d₃₃ = 125 pC/N). Electrostrictive and ferroelectric compositions in the NBT-BT-NBZ system show the highest actuation strain and d₃₃ reported to date in any polycrystalline, lead-free composition."],"dc:description.degree":["S.M."],"dc:format.mimetype":["application/pdf"],"dc:identifier.uri":["http://hdl.handle.net/1721.1/28621"],"dc:language.iso":["en_US"],"dc:publisher":["Massachusetts Institute of Technology"],"dc:rights":["M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission."],"dc:rights.uri":["http://dspace.mit.edu/handle/1721.1/7582"],"dc:subject":["Materials Science and Engineering."],"dc:title":["Dielectric and electromechanical properties of barium and zirconium co-doped sodium bismuth titanate"],"dc:type":["Thesis"]},"updated_at":"2026-07-22T22:21:24Z"}