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US 12,753,122 B2Granted
Lead-free piezoelectric ceramic composition and piezoelectric element
AssigneeNiterra Co., Ltd.
InventorsYoshinobu Hirose, Takayuki Matsuoka, Kentaro Ichihashi, Masato Yamazaki
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Abstract
A lead-free piezoelectric ceramic composition includes a main phase containing an alkali niobate/tantalate perovskite oxide, and a subphase containing a spinel compound containing Ti (titanium). The piezoelectric ceramic composition contains Mn (manganese). A Ti content x is greater than 0 mol % and not greater than 4 mol %, and the Ti content x and an Mn content y satisfy an expression, x2/y≤20.0.
Claims9
A lead-free piezoelectric ceramic composition characterized by comprising:
- a main phase containing an alkali niobate/tantalate perovskite oxide;
- and
- a subphase containing a spinel compound containing Ti (titanium),
- wherein the piezoelectric ceramic composition contains Mn (manganese), and
- wherein a Ti content x is greater than 0 mol % and not greater than 4 mol %, and the Ti content x and an Mn content y satisfy the following relational expression (1):
- x
- 2
- /
- y
- ≤
- 2
-
- 0.
- .
- expression
-
- (
- 1
- )
16 more elements
Dependencies are inferred from the claim text.