- AutorIn
- Gerd Ohlendorf
- Denny Richter
- Jan Sauerwald
- Holger Fritze
- Titel
- High-temperature electrical conductivity and electromechanical properties of stoichiometric lithium niobate
- Zitierfähige Url:
- https://nbn-resolving.org/urn:nbn:de:bsz:15-qucosa-192902
- Quellenangabe
- Diffusion fundamentals - 8
- Quellenangabe
- Diffusion fundamentals 8 (2008) 6, S. 1-7
- Erstveröffentlichung
- 2008
- Abstract (EN)
- High temperature properties such as electrical conductivity (σ) and resonance behaviour of stoichiometric lithium niobate (LiNbO3) are determined in the temperature range from 20 to 950 °C. The activation energy of the conductivity is found to be 0.9 and 1.7 eV in the temperature range from 500 to 750 °C and from 800 to 950 °C, respectively. During thermal treatments in ambient air up to 950 °C and back, the conductivity remains unchanged at a given temperature, i.e., the crystal is stable under these conditions. The oxygen partial pressure (pO2) dependence of the conductivity shows two distinct ranges. At 750 °C, the property remains unchanged down to 10−15 bar. Below 10−15 bar, the conductivity increases according to σ ~ (pO2)−1/5. Z-cut LiNbO3 plates can be excited to thickness mode vibrations up to at least 900 °C. At this temperature, the quality factor Q is found to be between 30 and 100. As for changes of the conductivity, a decrease of the resonance frequency is observed below 10−15 bar indicating a correlation of both properties. In order to evaluate the lithium evaporation, the crystals are tempered at 900 °C in ambient air for 24 h. A depth profile of the constituents does not indicate lithium loss within the accuracy of the secondary ion mass spectroscopy. The preliminary results underline the potential of stoichiometric LiNbO3 for high-temperature applications and justify its closer investigation.
- Freie Schlagwörter (DE)
- Diffusion, Transport
- Freie Schlagwörter (EN)
- diffusion, transport
- Klassifikation (DDC)
- 530
- Herausgeber (Institution)
- Clausthal University of Technology
- Universität Leipzig
- URN Qucosa
- urn:nbn:de:bsz:15-qucosa-192902
- Veröffentlichungsdatum Qucosa
- 04.01.2016
- Dokumenttyp
- Artikel
- Sprache des Dokumentes
- Englisch