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Piezoelectric properties of (Li, Na, K)NbO ceramics with monoclinic system

Key Engineering Materials, ISSN: 1662-9795, Vol: 485, Page: 57-60
2011
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Conference Paper Description

The relationship between the piezoelectric properties and crystal lattice deformation and distortion resulting from the Li substitution in Li Na052K48-XNbO, alkaline niobate-based perovskite ceramics of (Li, Na, K)NbO, was investigated. The lattice parameters of the sample with a Li content X = 0.05 and having a monoclinic system with space group Pm were A = 3.9789(6) Å, B = 3.9385(5) Å, C = 4.0134(6) Å, and β= 90.305(4)°. The ε/ε, K and -D values of the sample by poling in the monoclinic system were 450, 44.6%, and 57 pC/N, respectively. On the other hand, the ε/ε, K and -D values of the sample by poling in the tetragonal system were 600, 38.7%, and 56 pC/N, respectively. The remarkable piezoelectric properties of these ceramics can be attributed only to the low symmetry of their monoclinic system, which is a subgroup of Amm2 and P4mm. Li05Na052K04 NbO ceramics with a monoclinic system were observed to have the unique piezoelectric characteristics. © (2011) Trans Tech Publications, Switzerland.

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