Lead-Free Piezoelectric Composition for High-Temperature Insulation
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Solution Overview
Problem
Lead-free piezoelectric compositions exhibit unsatisfactory insulation properties at high temperatures, despite having excellent piezoelectric characteristics under high electric fields.
Innovation Solution
A lead-free piezoelectric composition containing alkali niobate perovskite-type oxide with specific ratios of Sc to Ti, along with other elements, and a grain size of 1.2 μm to 8.1 μm, is used to enhance insulation and piezoelectric characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If lead-free alkali niobate perovskite-type oxide is used as piezoelectric material, then piezoelectric characteristics under high electric field are improved, but insulation property at high temperature deteriorates
Solution Approach 1:
The invention changes the compositional parameters by introducing specific ratios of Sc to Ti (0.004 or more and 8 or less) and controlling the content of elements A1, M1, Nb, Mn, and Zr within specific ranges. This parameter optimization resolves the contradiction by achieving both high piezoelectric characteristics (d33 ≥ 132 pm/V) and satisfactory insulation properties at high temperature through precise compositional control
Solution Approach 2:
The invention creates a composite piezoelectric material by combining multiple elements (A1, M1, Nb, Mn, Ti, Zr, Sc) in a perovskite structure. The synergistic effect of these elements, particularly the combination of Mn for piezoelectric enhancement and Sc/Ti for insulation improvement, resolves the contradiction between piezoelectric performance and high-temperature insulation properties
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composition achieves excellent piezoelectric characteristics and insulation properties at high temperatures, with a maximum displacement-to-field ratio exceeding 132 pm/V and insulation resistance of 4×10^8 Ω·m or higher at 150°C.
Implementation Method 1
When voltage is applied to the piezoelectric element, the piezoelectric ceramic undergoes expansion and contraction in response to the applied voltage. Thus, the piezoelectric element exhibits suitable piezoelectric characteristics under high electric field.
Implementation Method 2
the insulation property is unsatisfactory at high temperature
Data Source
AI summary
A lead-free piezoelectric composition including, as a main component, an alkali niobate perovskite-type oxide containing Mn, Ti, and Sc, which composition has a ratio of Sc content to Ti content of 0.004 or more and 8 or less.