Investigation of the crystal structure of polymorphic KNbO3 nanowires by pressure
We have investigated the pressure-induced structural phase transition of orthorhombic and monoclinic KNbO3 nanowires by using x-ray diffraction (XRD) and Raman spectroscopy. Monoclinic KNbO3 nanowires underwent phase transitions three times: monoclinic to tetragonal, tetragonal to cubic, and cubic t...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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AIP Publishing LLC
2019-04-01
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| Series: | AIP Advances |
| Online Access: | http://dx.doi.org/10.1063/1.5088708 |
| _version_ | 1819265860926177280 |
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| author | Kyoung Hun Oh Young-Ho Ko Kwang-Joo Kim |
| author_facet | Kyoung Hun Oh Young-Ho Ko Kwang-Joo Kim |
| author_sort | Kyoung Hun Oh |
| collection | DOAJ |
| description | We have investigated the pressure-induced structural phase transition of orthorhombic and monoclinic KNbO3 nanowires by using x-ray diffraction (XRD) and Raman spectroscopy. Monoclinic KNbO3 nanowires underwent phase transitions three times: monoclinic to tetragonal, tetragonal to cubic, and cubic to orthorhombic-2 phase near 2.2 GPa, 8.2 GPa, and 40.0 GPa, respectively. Meanwhile, orthorhombic KNbO3 nanowires showed a phase transition once, orthorhombic to cubic phase near 8.5 GPa. Their exact structures were determined by the Rietveld method and confirmed by Raman spectroscopy. P-V equations of state for two kinds of KNbO3 nanowires were also derived from XRD data. Moreover, the elastic properties of the two nanowires in various structural phases were calculated. It was observed that two polymorphic nanowires, one from the monoclinic phase and the other from the orthorhombic phase, might have different isothermal bulk moduli even in the same crystal phase under high pressure. |
| first_indexed | 2024-12-23T20:52:06Z |
| format | Article |
| id | doaj.art-8e61c4f01897488a90f37cdca2d8ac6f |
| institution | Directory Open Access Journal |
| issn | 2158-3226 |
| language | English |
| last_indexed | 2024-12-23T20:52:06Z |
| publishDate | 2019-04-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | AIP Advances |
| spelling | doaj.art-8e61c4f01897488a90f37cdca2d8ac6f2022-12-21T17:31:38ZengAIP Publishing LLCAIP Advances2158-32262019-04-0194045207045207-810.1063/1.5088708007904ADVInvestigation of the crystal structure of polymorphic KNbO3 nanowires by pressureKyoung Hun Oh0Young-Ho Ko1Kwang-Joo Kim24-2-2, Agency for Defense Development, P.O. Box 35, YuSeong, DaeJeon 305-600, Republic of Korea4-2-2, Agency for Defense Development, P.O. Box 35, YuSeong, DaeJeon 305-600, Republic of Korea4-2-2, Agency for Defense Development, P.O. Box 35, YuSeong, DaeJeon 305-600, Republic of KoreaWe have investigated the pressure-induced structural phase transition of orthorhombic and monoclinic KNbO3 nanowires by using x-ray diffraction (XRD) and Raman spectroscopy. Monoclinic KNbO3 nanowires underwent phase transitions three times: monoclinic to tetragonal, tetragonal to cubic, and cubic to orthorhombic-2 phase near 2.2 GPa, 8.2 GPa, and 40.0 GPa, respectively. Meanwhile, orthorhombic KNbO3 nanowires showed a phase transition once, orthorhombic to cubic phase near 8.5 GPa. Their exact structures were determined by the Rietveld method and confirmed by Raman spectroscopy. P-V equations of state for two kinds of KNbO3 nanowires were also derived from XRD data. Moreover, the elastic properties of the two nanowires in various structural phases were calculated. It was observed that two polymorphic nanowires, one from the monoclinic phase and the other from the orthorhombic phase, might have different isothermal bulk moduli even in the same crystal phase under high pressure.http://dx.doi.org/10.1063/1.5088708 |
| spellingShingle | Kyoung Hun Oh Young-Ho Ko Kwang-Joo Kim Investigation of the crystal structure of polymorphic KNbO3 nanowires by pressure AIP Advances |
| title | Investigation of the crystal structure of polymorphic KNbO3 nanowires by pressure |
| title_full | Investigation of the crystal structure of polymorphic KNbO3 nanowires by pressure |
| title_fullStr | Investigation of the crystal structure of polymorphic KNbO3 nanowires by pressure |
| title_full_unstemmed | Investigation of the crystal structure of polymorphic KNbO3 nanowires by pressure |
| title_short | Investigation of the crystal structure of polymorphic KNbO3 nanowires by pressure |
| title_sort | investigation of the crystal structure of polymorphic knbo3 nanowires by pressure |
| url | http://dx.doi.org/10.1063/1.5088708 |
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