High temperature phase stability in Li{sub 0.12}Na{sub 0.88}NbO{sub 3}: A combined powder X-ray and neutron diffraction study
- Solid State Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085 (India)
The phase stabilities of ecofriendly piezoelectric material of lithium doped sodium niobate for composition Li{sub 0.12}Na{sub 0.88}NbO{sub 3} (LNN12) have been investigated by a combination of powder X-ray and neutron diffraction techniques in the temperature range of 300–1100 K. We observed interesting changes with appearance or disappearance of the super-lattice reflections in the powder diffraction patterns. Unambiguous experimental evidence is shown for coexistence of paraelectric and ferroelectric orthorhombic phases in the temperature range of 525 K to 675 K. We identified the correct crystal structure of LNN12 with temperature and correlated it with observed anomaly in the physical properties. Identification of crystal structure also helps in the mode assignments in Raman and infrared spectroscopies. We argued that application of chemical pressure as a result of Li substitution in NaNbO{sub 3} matrix favors the freezing of zone centre phonons in contrast to the freezing of zone boundary phonons in pure NaNbO{sub 3} with the variation of temperature.
- OSTI ID:
- 22494823
- Journal Information:
- Journal of Applied Physics, Vol. 118, Issue 9; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
DOPED MATERIALS
FERROELECTRIC MATERIALS
INFRARED SPECTRA
LITHIUM
NEUTRON DIFFRACTION
NIOBATES
ORTHORHOMBIC LATTICES
PHASE STABILITY
PHONONS
PHYSICAL PROPERTIES
PIEZOELECTRICITY
RAMAN SPECTROSCOPY
REFLECTION
SODIUM COMPOUNDS
TEMPERATURE RANGE 0400-1000 K
X-RAY DIFFRACTION