Co-Doping Effect of BiGaO3 and (Bi,Na,K,Li)ZrO3 on Multi-Phase Structure and Piezoelectric Properties of (K,Na)NbO3 Lead-Free Ceramics
The phase boundary structure of (K,Na)NbO3 piezoelectric ceramic was modified by doping with Bi(Na,K,Li)ZrO3 and BiGaO3 through normal solid-state sintering. Rietveld refinements by X-ray diffraction revealed that the Bi(Na,K,Li)ZrO3/BiGaO3 co-doping in (K,Na)NbO3 led to a multi-phase structure at r...
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MDPI AG
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| Online Access: | http://www.mdpi.com/1996-1073/12/5/886 |
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| author | Min-Ku Lee Sang-Don Bu Gyoung-Ja Lee |
| author_facet | Min-Ku Lee Sang-Don Bu Gyoung-Ja Lee |
| author_sort | Min-Ku Lee |
| collection | DOAJ |
| description | The phase boundary structure of (K,Na)NbO3 piezoelectric ceramic was modified by doping with Bi(Na,K,Li)ZrO3 and BiGaO3 through normal solid-state sintering. Rietveld refinements by X-ray diffraction revealed that the Bi(Na,K,Li)ZrO3/BiGaO3 co-doping in (K,Na)NbO3 led to a multi-phase structure at room-temperature, effectively moving the rhombohedral-orthorhombic (R-O) and orthorhombic-tetragonal (O-T) polymorphic phase transition temperatures close to the room temperature region. Increased levels of doping also generated a structural transition, i.e., triphasic R-O-T to diphasic R-T (T-rich) and finally to R-T (R-rich), contributing to shrinkage of the O phase as well as the increase of R phase fraction. A sensitive influence of the BiGaO3 doping (0.001 mole fraction level) on the structural properties such as the phase and microstructure was shown, resulting from the effect of the super-tetragonal structure of BiGaO3. The d33 property was strongly dependent on the phase and its volume fraction, in addition to the grain sizes. Eventually, enhanced and balanced properties of the piezoelectric coefficient and Curie temperature (d33 = 309 pC/N, TC = 343 °C) were obtained when the doped ceramic had a T-rich (86%) R-T structure. |
| first_indexed | 2024-04-11T11:02:34Z |
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| id | doaj.art-05d888515d6849afba48d2cf554ca1b8 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-11T11:02:34Z |
| publishDate | 2019-03-01 |
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| series | Energies |
| spelling | doaj.art-05d888515d6849afba48d2cf554ca1b82022-12-22T04:28:29ZengMDPI AGEnergies1996-10732019-03-0112588610.3390/en12050886en12050886Co-Doping Effect of BiGaO3 and (Bi,Na,K,Li)ZrO3 on Multi-Phase Structure and Piezoelectric Properties of (K,Na)NbO3 Lead-Free CeramicsMin-Ku Lee0Sang-Don Bu1Gyoung-Ja Lee2Nuclear Materials Development Division, Korea Atomic Energy Research Institute, Daejeon 34057, KoreaDepartment of Physics and Research Institute of Physics and Chemistry, Chonbuk National University, Jeonju 54896, KoreaNuclear Materials Development Division, Korea Atomic Energy Research Institute, Daejeon 34057, KoreaThe phase boundary structure of (K,Na)NbO3 piezoelectric ceramic was modified by doping with Bi(Na,K,Li)ZrO3 and BiGaO3 through normal solid-state sintering. Rietveld refinements by X-ray diffraction revealed that the Bi(Na,K,Li)ZrO3/BiGaO3 co-doping in (K,Na)NbO3 led to a multi-phase structure at room-temperature, effectively moving the rhombohedral-orthorhombic (R-O) and orthorhombic-tetragonal (O-T) polymorphic phase transition temperatures close to the room temperature region. Increased levels of doping also generated a structural transition, i.e., triphasic R-O-T to diphasic R-T (T-rich) and finally to R-T (R-rich), contributing to shrinkage of the O phase as well as the increase of R phase fraction. A sensitive influence of the BiGaO3 doping (0.001 mole fraction level) on the structural properties such as the phase and microstructure was shown, resulting from the effect of the super-tetragonal structure of BiGaO3. The d33 property was strongly dependent on the phase and its volume fraction, in addition to the grain sizes. Eventually, enhanced and balanced properties of the piezoelectric coefficient and Curie temperature (d33 = 309 pC/N, TC = 343 °C) were obtained when the doped ceramic had a T-rich (86%) R-T structure.http://www.mdpi.com/1996-1073/12/5/886lead-free piezoelectric ceramicspotassium-sodium niobate (KNN)phase boundary structurephase fraction |
| spellingShingle | Min-Ku Lee Sang-Don Bu Gyoung-Ja Lee Co-Doping Effect of BiGaO3 and (Bi,Na,K,Li)ZrO3 on Multi-Phase Structure and Piezoelectric Properties of (K,Na)NbO3 Lead-Free Ceramics Energies lead-free piezoelectric ceramics potassium-sodium niobate (KNN) phase boundary structure phase fraction |
| title | Co-Doping Effect of BiGaO3 and (Bi,Na,K,Li)ZrO3 on Multi-Phase Structure and Piezoelectric Properties of (K,Na)NbO3 Lead-Free Ceramics |
| title_full | Co-Doping Effect of BiGaO3 and (Bi,Na,K,Li)ZrO3 on Multi-Phase Structure and Piezoelectric Properties of (K,Na)NbO3 Lead-Free Ceramics |
| title_fullStr | Co-Doping Effect of BiGaO3 and (Bi,Na,K,Li)ZrO3 on Multi-Phase Structure and Piezoelectric Properties of (K,Na)NbO3 Lead-Free Ceramics |
| title_full_unstemmed | Co-Doping Effect of BiGaO3 and (Bi,Na,K,Li)ZrO3 on Multi-Phase Structure and Piezoelectric Properties of (K,Na)NbO3 Lead-Free Ceramics |
| title_short | Co-Doping Effect of BiGaO3 and (Bi,Na,K,Li)ZrO3 on Multi-Phase Structure and Piezoelectric Properties of (K,Na)NbO3 Lead-Free Ceramics |
| title_sort | co doping effect of bigao3 and bi na k li zro3 on multi phase structure and piezoelectric properties of k na nbo3 lead free ceramics |
| topic | lead-free piezoelectric ceramics potassium-sodium niobate (KNN) phase boundary structure phase fraction |
| url | http://www.mdpi.com/1996-1073/12/5/886 |
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