Lead-Free Piezoelectric Material Composition for High Mechanical Quality Factor
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Solution Overview
Problem
Existing lead-free piezoelectric materials face challenges in achieving a balance between high piezoelectric constants and high mechanical quality factors, with known compositions often compromising on either property.
Innovation Solution
A piezoelectric material comprising a perovskite-type metal oxide with specific ratios of Na, Ba, Ti, Nb, Ni, Mn, and Mg, optimized to achieve a mechanical quality factor of 500 or more while maintaining high piezoelectric properties, is developed. This material does not contain lead, potassium, or cobalt, ensuring environmental sustainability and improved sinterability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If cobalt oxide is added to NN-BT ceramic to increase piezoelectric constant, then piezoelectric constant is improved, but mechanical quality factor deteriorates and insulation resistance decreases
Solution Approach 1:
The invention extracts and removes cobalt oxide from the composition entirely, replacing it with nickel oxide and manganese oxide additives that can improve piezoelectric constant without the harmful side effects of cobalt, thus maintaining mechanical quality factor
Solution Approach 2:
The invention uses a composite additive system combining nickel oxide and manganese oxide in specific ratios, creating a synergistic effect that achieves high piezoelectric constant while preserving mechanical quality factor, unlike the single-additive cobalt oxide approach
2Power
If piezoelectric constant is increased through composition adjustment, then piezoelectric properties are improved, but mechanical quality factor decreases
Solution Approach 1:
The invention changes the compositional parameters by specifying precise ranges for barium titanate content (5-20 mass%) and additive ratios (nickel oxide 0.01-0.1 mass%, manganese oxide 0.003-0.03 mass%), optimizing the balance between piezoelectric constant and mechanical quality factor
Solution Approach 2:
The invention employs a composite material system with multiple oxides (sodium niobate, barium titanate, nickel oxide, manganese oxide) in controlled proportions, achieving synergistic effects that simultaneously enhance piezoelectric properties and maintain mechanical quality factor
3Object-affected harmful factors
If lead-free composition is used for environmental safety, then environmental compatibility is improved, but achieving high mechanical quality factor becomes difficult
Solution Approach 1:
The invention extracts and eliminates lead and potassium from the composition, replacing them with environmentally friendly alternatives (nickel oxide, manganese oxide, magnesium oxide) that achieve comparable or superior mechanical quality factor while maintaining environmental compatibility
Solution Approach 2:
The invention changes the compositional parameters to exclude harmful elements and specifies precise ranges for benign additives, achieving mechanical quality factor of 500 or more without lead, potassium, or cobalt
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 material achieves a high mechanical quality factor of 500 or more while preserving excellent piezoelectric properties, ensuring compatibility and environmental safety, making it suitable for various applications such as capacitors, sensors, and ultrasonic motors.
Implementation Method 1
Piezoelectric materials are generally metal oxides having a perovskite-type structure called perovskite-type metal oxides (ABO3)
Data Source
AI summary
The piezoelectric material of the present invention includes a main component composed of a perovskite-type metal oxide represented by Formula (1), at least one of Mn and Ni, and Mg. The content of Ni is 0 mol or more and 0.05 mol or less based on 1 mol of the perovskite-type metal oxide, and the content of Mn is 0 mol or more and 0.005 mol or less based on 1 mol of the perovskite-type metal oxide, provided that the content of Mn and the content of Ni are not simultaneously 0 mol. The content of Mg is 0.001 mol or more and 0.020 mol or less based on 1 mol of the perovskite-type metal oxide.Formula (1): (NaxBa1-y)(NbyTi1-y)O3 (where x is 0.83 or more and 0.95 or less, y is 0.85 or more and 0.95 or less, and x/y is 0.95 or more and 1.05 or less).