Edge-defined film-fed growth of single-crystal piezoelectrics
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2001.
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| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2005
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| Online Access: | http://hdl.handle.net/1721.1/17530 |
| _version_ | 1826194112071598080 |
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| author | Nunes, Benjamin P. (Benjamin Paul), 1976- |
| author2 | Yet-Ming Chiang. |
| author_facet | Yet-Ming Chiang. Nunes, Benjamin P. (Benjamin Paul), 1976- |
| author_sort | Nunes, Benjamin P. (Benjamin Paul), 1976- |
| collection | MIT |
| description | Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2001. |
| first_indexed | 2024-09-23T09:51:10Z |
| format | Thesis |
| id | mit-1721.1/17530 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T09:51:10Z |
| publishDate | 2005 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/175302019-04-10T23:06:42Z Edge-defined film-fed growth of single-crystal piezoelectrics Nunes, Benjamin P. (Benjamin Paul), 1976- Yet-Ming Chiang. Massachusetts Institute of Technology. Dept. of Materials Science and Engineering. Massachusetts Institute of Technology. Dept. of Materials Science and Engineering. Materials Science and Engineering. Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2001. Includes bibliographical references (leaves 97-99). Many transducer technologies would benefit tremendously from the development of shaped, oriented single-crystals, of a high-strain, piezoelectric material. Recently, unusually high electrostrictive and piezoelectric actuation has been observed in polycrystals and flux-grown <100> single-crystals of ... Using seeded, Edgedefined Film-fed Growth (EFG) and the related Stepanov Technique (ST), low-hysteresis, highstrain, <100> and <111> oriented, single-crystals of BNBZT can be grown in rod and fiber form, with direct applications in active fiber composites and related devices. For this work, <100> and <111> oriented, single-crystal rods and fibers were grown via ST and EFG. Fibers, 260-700[mu]m in diameter and over 1.0 meter long, were grown using a custom built EFG machine and a capillary-shaper; rods, 2-3mm in diameter, up to 110mm long were grown using a floating-shaper. In all cases, strontium titanate (STO) was found to be an effective seed crystal. <111> oriented tetragonal crystals generated low hysteresis actuation consistent with a polarization rotation mechanism [14], but with only modest strains: ... <100> oriented tetragonal BNBZT generated high strains up to ... with hysteresis consistent with 90° domain switching. Electromechanical actuation and crystal structure in this system appear to be strongly affected by deviations from stoichiometry (B-site vacancies). Barium segregation and bismuth vaporization can also compromise electromechanical performance. Hypotheses are posed to explain the low actuation seen from <111> oriented ferroelectrics, and the effects of cation deficiencies on phase-stability. Cracks, pores, and other growth challenges encountered in ST and EFG growth of BNBZT are described. by Benjamin P. Nunes. S.M. 2005-06-02T16:04:04Z 2005-06-02T16:04:04Z 2001 2001 Thesis http://hdl.handle.net/1721.1/17530 50633484 eng 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. http://dspace.mit.edu/handle/1721.1/7582 99 leaves 4780675 bytes 4780484 bytes application/pdf application/pdf application/pdf Massachusetts Institute of Technology |
| spellingShingle | Materials Science and Engineering. Nunes, Benjamin P. (Benjamin Paul), 1976- Edge-defined film-fed growth of single-crystal piezoelectrics |
| title | Edge-defined film-fed growth of single-crystal piezoelectrics |
| title_full | Edge-defined film-fed growth of single-crystal piezoelectrics |
| title_fullStr | Edge-defined film-fed growth of single-crystal piezoelectrics |
| title_full_unstemmed | Edge-defined film-fed growth of single-crystal piezoelectrics |
| title_short | Edge-defined film-fed growth of single-crystal piezoelectrics |
| title_sort | edge defined film fed growth of single crystal piezoelectrics |
| topic | Materials Science and Engineering. |
| url | http://hdl.handle.net/1721.1/17530 |
| work_keys_str_mv | AT nunesbenjaminpbenjaminpaul1976 edgedefinedfilmfedgrowthofsinglecrystalpiezoelectrics |