Articles you may be interested inHole conduction and electro-mechanical properties of Na0.5Bi2.5Ta2O9-based piezoelectric ceramics with the Li+/Ce3+/Sc3+ modification J. Appl. Phys. 116, 074111 (2014); 10.1063/1.4893643Lead-free piezoelectric ceramics based on (0.97−x)K0.48Na0.52NbO3-0.03Bi0.5(Na0.7K0.2Li0.1)0.5ZrO3-xB0.5Na0.5TiO3 ternary system
The effect of (Li,Ce) substitution for A-site on the properties of [(Na 0.52 K 0.42 Li 0.06 )Bi] 0.5 Bi 2 (Nb 1.88 Sb 0.06 Ta 0.06 )O 9 -based ceramics was investigated. The piezoelectric activity of [(Na 0.52 K 0.42 Li 0.06 )Bi] 0.5 Bi 2 (Nb 1.88 Sb 0.06 Ta 0.06 )O 9 -based ceramics is significantly improved by the modification of lithium and cerium. The Curie temperature (T C ) gradually decreases from 625 to 605 o C with increasing the (Li,Ce) modification. The piezoelectric coefficient d 33 of the [(Na 0.52 K 0.42 Li 0.06 )Bi] 0.44 (Li,-Ce) 0.03 [] 0.03 Bi 2 (Nb 1.88 Sb 0.06 Ta 0.06 )O 9 ceramic was found to be 28 pC/N, the highest value among the [(Na 0.52 K 0.42 Li 0.06 )-Bi] 0.5 Bi 2 (Nb 1.88 Sb 0.06 Ta 0.06 )O 9 -based ceramics, also almost 50% higher than the reported d 33 values of other Bismuth layerstructured ferroelectric (BLSF) systems ($5-19 pC/N). The planar coupling factor k p and k t were found to be 7.0 and 28.0%, together with the high T C ($610 8C) and stable piezoelectric properties, demonstrating that the (Li,Ce) modified [(Na 0.52 K 0.42 Li 0.06 )Bi] 0.5 Bi 2 (Nb 1.88 Sb 0.06 Ta 0.06 )O 9 -based material a promising candidate for high temperature applications.
The effect of Ce substitution at the A-site on the properties of Na0.5Bi4.5Ti4O15 (NBT)–based ceramics was systematically investigated. The substitution at A-site caused distortion of lattice and improved piezoelectric activity correspondingly. The piezoelectric coefficient d33 of the Na0.5Bi4.5-xCexTi4O15 (x=0.03) ceramic was found to be as high as 26 pC/N, together with high mechanical quality factor Q ( 2769 ), and stable piezoelectric properties, demonstrating that the Ce-modified NBT-based materials are promising candidates for high-temperature applications.
Na0.5Bi4.5Ti4O15-based materials with A-site vacancy were synthesized using conventional solid state processing. The (Li,Ce) modification of Na0.5Bi4.5Ti4O15-based materials resulted in the obvious improvement of the piezoelectric activity and dielectric permittivity. The dielectric and piezoelectric properties of Na0.5Bi4.5Ti4O15-based ceramics exhibiting a very stable temperature behavior, together with its high TC ~641oC, excellent piezoelectric coefficient ~28pC/N and very low temperature coefficient of resonant frequency, making the (Li,Ce) modified Na0.5Bi4.5Ti4O15-based ceramics a promising candidate for high temperature applications.
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