Simultaneously improving piezoelectric properties and temperature stability of Na0.5K0.5NbO3 (KNN)-based ceramics sintered in reducing atmosphere
Abstract It is a very difficult work to sinter K0.5Na0.5NbO3 (KNN)-based materials with good reduction resistance in strong reducing atmosphere. 0.945K0.48Na0.52Nb0.96Ta0.04O3−0.055BaZrO3 + 0.03ZrO2 + y mol%MnO (KNNT−0.055BZ + 0.03Zr + yMn) ceramics sintered in reducing atmosphere were prepared succ...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Tsinghua University Press
2021-07-01
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| Series: | Journal of Advanced Ceramics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/s40145-021-0475-0 |
| _version_ | 1797713212402040832 |
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| author | Zhenyong Cen Shuaishuai Bian Ze Xu Ke Wang Limin Guo Longtu Li Xiaohui Wang |
| author_facet | Zhenyong Cen Shuaishuai Bian Ze Xu Ke Wang Limin Guo Longtu Li Xiaohui Wang |
| author_sort | Zhenyong Cen |
| collection | DOAJ |
| description | Abstract It is a very difficult work to sinter K0.5Na0.5NbO3 (KNN)-based materials with good reduction resistance in strong reducing atmosphere. 0.945K0.48Na0.52Nb0.96Ta0.04O3−0.055BaZrO3 + 0.03ZrO2 + y mol%MnO (KNNT−0.055BZ + 0.03Zr + yMn) ceramics sintered in reducing atmosphere were prepared successfully by conventional solid-state reaction methods. MnO dopant increases grain size at y = 5–8 due to strong lattice distortion and then decreases grain size at y = 9 due to much Mn4Nb2O9 accumulated at the grain boundary. MnO dopant as an excellent sintering aid can effectively reduce volatilization of alkali metal by decreasing the sintering temperature (T sinter). Reducing alkali metal volatilization can greatly reduce oxygen vacancies and improve piezoelectric properties. MnO dopant can improve the anti-reduction properties. The KNNT−0.055BZ + 0.03Zr + yMn ceramics at y = 6–9 show outstanding anti-fatigue of unipolar piezoelectric strain under the synergistic effect of reduced oxygen vacancies due to reduced volatilization and increased grain size. Piezoelectric properties and temperature stability of KNNT−0.055BZ + 0.03Zr ceramics sintered in reducing atmosphere are improved simultaneously by MnO dopant. Optimum inverse piezoelectric coefficient (d 33 * ) of ceramics at y = 8 reaches up to 480 pm/V under low driving electric field E = 20 kV/cm at room temperature, and its temperature stability of d 33 * reaches 158 °C. It will be an excellent lead-free material candidate for the preparation of multilayer piezoelectric actuators co-fired with nickel electrode. |
| first_indexed | 2024-03-12T07:33:05Z |
| format | Article |
| id | doaj.art-4e1d5315759b43d18d5fd6cfeea25946 |
| institution | Directory Open Access Journal |
| issn | 2226-4108 2227-8508 |
| language | English |
| last_indexed | 2024-03-12T07:33:05Z |
| publishDate | 2021-07-01 |
| publisher | Tsinghua University Press |
| record_format | Article |
| series | Journal of Advanced Ceramics |
| spelling | doaj.art-4e1d5315759b43d18d5fd6cfeea259462023-09-02T21:38:21ZengTsinghua University PressJournal of Advanced Ceramics2226-41082227-85082021-07-0110482083110.1007/s40145-021-0475-0Simultaneously improving piezoelectric properties and temperature stability of Na0.5K0.5NbO3 (KNN)-based ceramics sintered in reducing atmosphereZhenyong Cen0Shuaishuai Bian1Ze Xu2Ke Wang3Limin Guo4Longtu Li5Xiaohui Wang6State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua UniversityState Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua UniversityState Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua UniversityState Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua UniversitySchool of Science, Beijing University of Posts and TelecommunicationsState Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua UniversityState Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua UniversityAbstract It is a very difficult work to sinter K0.5Na0.5NbO3 (KNN)-based materials with good reduction resistance in strong reducing atmosphere. 0.945K0.48Na0.52Nb0.96Ta0.04O3−0.055BaZrO3 + 0.03ZrO2 + y mol%MnO (KNNT−0.055BZ + 0.03Zr + yMn) ceramics sintered in reducing atmosphere were prepared successfully by conventional solid-state reaction methods. MnO dopant increases grain size at y = 5–8 due to strong lattice distortion and then decreases grain size at y = 9 due to much Mn4Nb2O9 accumulated at the grain boundary. MnO dopant as an excellent sintering aid can effectively reduce volatilization of alkali metal by decreasing the sintering temperature (T sinter). Reducing alkali metal volatilization can greatly reduce oxygen vacancies and improve piezoelectric properties. MnO dopant can improve the anti-reduction properties. The KNNT−0.055BZ + 0.03Zr + yMn ceramics at y = 6–9 show outstanding anti-fatigue of unipolar piezoelectric strain under the synergistic effect of reduced oxygen vacancies due to reduced volatilization and increased grain size. Piezoelectric properties and temperature stability of KNNT−0.055BZ + 0.03Zr ceramics sintered in reducing atmosphere are improved simultaneously by MnO dopant. Optimum inverse piezoelectric coefficient (d 33 * ) of ceramics at y = 8 reaches up to 480 pm/V under low driving electric field E = 20 kV/cm at room temperature, and its temperature stability of d 33 * reaches 158 °C. It will be an excellent lead-free material candidate for the preparation of multilayer piezoelectric actuators co-fired with nickel electrode.https://doi.org/10.1007/s40145-021-0475-0lead-free piezoelectric ceramicsreducing atmospherefatigue propertytemperature stability |
| spellingShingle | Zhenyong Cen Shuaishuai Bian Ze Xu Ke Wang Limin Guo Longtu Li Xiaohui Wang Simultaneously improving piezoelectric properties and temperature stability of Na0.5K0.5NbO3 (KNN)-based ceramics sintered in reducing atmosphere Journal of Advanced Ceramics lead-free piezoelectric ceramics reducing atmosphere fatigue property temperature stability |
| title | Simultaneously improving piezoelectric properties and temperature stability of Na0.5K0.5NbO3 (KNN)-based ceramics sintered in reducing atmosphere |
| title_full | Simultaneously improving piezoelectric properties and temperature stability of Na0.5K0.5NbO3 (KNN)-based ceramics sintered in reducing atmosphere |
| title_fullStr | Simultaneously improving piezoelectric properties and temperature stability of Na0.5K0.5NbO3 (KNN)-based ceramics sintered in reducing atmosphere |
| title_full_unstemmed | Simultaneously improving piezoelectric properties and temperature stability of Na0.5K0.5NbO3 (KNN)-based ceramics sintered in reducing atmosphere |
| title_short | Simultaneously improving piezoelectric properties and temperature stability of Na0.5K0.5NbO3 (KNN)-based ceramics sintered in reducing atmosphere |
| title_sort | simultaneously improving piezoelectric properties and temperature stability of na0 5k0 5nbo3 knn based ceramics sintered in reducing atmosphere |
| topic | lead-free piezoelectric ceramics reducing atmosphere fatigue property temperature stability |
| url | https://doi.org/10.1007/s40145-021-0475-0 |
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