A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
LEAD-FREE PIEZOELECTRIC CERAMIC COMPOSITION, PIEZOELECTRIC ELEMENT USING THE SAME, AND METHOD OF MANUFACTURING LEAD-FREE PIEZOELECTRIC CERAMIC COMPOSITION
A lead-free piezoelectric ceramic composition including an alkali niobate/tantalate perovskite oxide main phase having piezoelectric properties and a different metal oxide. The mole ratio (Na/K) between Na (sodium) and K (potassium) in the main phase is 0.40<(Na/K)<3.0. The main phase has a crystal structure in which (i) first spots corresponding to a primitive lattice period and (ii) second spots corresponding to the lattice period two times the primitive lattice period and being weaker than the first spots appear in an electron beam diffraction image entering from the <100> direction with the main phase represented as a pseudo-cubic crystal system. Also, the area ratio of a crystal phase reflecting the second spots in the main phase is 33% or less, and the maximum grain size of crystals reflecting the second spots in the main phase is 25 nm or less.
LEAD-FREE PIEZOELECTRIC CERAMIC COMPOSITION, PIEZOELECTRIC ELEMENT USING THE SAME, AND METHOD OF MANUFACTURING LEAD-FREE PIEZOELECTRIC CERAMIC COMPOSITION
A lead-free piezoelectric ceramic composition including an alkali niobate/tantalate perovskite oxide main phase having piezoelectric properties and a different metal oxide. The mole ratio (Na/K) between Na (sodium) and K (potassium) in the main phase is 0.40<(Na/K)<3.0. The main phase has a crystal structure in which (i) first spots corresponding to a primitive lattice period and (ii) second spots corresponding to the lattice period two times the primitive lattice period and being weaker than the first spots appear in an electron beam diffraction image entering from the <100> direction with the main phase represented as a pseudo-cubic crystal system. Also, the area ratio of a crystal phase reflecting the second spots in the main phase is 33% or less, and the maximum grain size of crystals reflecting the second spots in the main phase is 25 nm or less.
LEAD-FREE PIEZOELECTRIC CERAMIC COMPOSITION, PIEZOELECTRIC ELEMENT USING THE SAME, AND METHOD OF MANUFACTURING LEAD-FREE PIEZOELECTRIC CERAMIC COMPOSITION
KOZUKA HISASHI (author) / YAMADA HIDETO (author) / MATSUOKA TAKAYUKI (author) / KITAMURA KAZUAKI (author) / YAMAZAKI MASATO (author) / KURAHASHI TOSHIAKI (author) / KASASHIMA TAKASHI (author) / OKIMURA YASUYUKI (author) / OHBAYASHI KAZUSHIGE (author)
2017-05-18
Patent
Electronic Resource
English
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