Piezoelectric Device High d33 Low Permittivity
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Solution Overview
Problem
Existing piezoelectric materials face challenges in achieving high values for both piezoelectric strain constant (d-constant) and voltage output constant (g-constant) simultaneously, which are essential for optimal performance in ultrasonic sensors and power generating devices, while also requiring low permittivity to minimize power consumption.
Innovation Solution
A piezoelectric device is developed with a piezoelectric body formed from perovskite oxides, including unavoidable impurities, where the strain constant d33 and relative permittivity ε33 satisfy specific formulas, and the device includes a composition represented by General Formula (P) such as BaBiATiFeMO3, with a tolerance factor within a certain range, allowing for high d33 values at low permittivity, thus achieving both superior transmission and reception capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If piezoelectric materials with high electromechanical coupling coefficient are used to increase d-constant, then transmission capability is improved, but permittivity increases which increases power consumption
Solution Approach 1:
The patent changes the material composition parameters by using specific perovskite oxide systems (Pb(Zr,Ti)O3, Pb1-xLaxZr1-yTiyO3, Pb1-xLaxZr1-yTi1-wMnwO3) with controlled stoichiometry and doping levels to achieve high d-constant while maintaining lower permittivity compared to conventional piezoelectric materials
Solution Approach 2:
The patent employs composite piezoelectric material systems combining perovskite oxides with specific dopants (La, Nb, Mn) to create a composite structure that achieves both high piezoelectric response and controlled permittivity, resolving the trade-off between transmission capability and power consumption
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 solution results in a piezoelectric device with high d33 and g33 values, enhancing both transmission and reception capabilities, reducing power consumption, and being suitable for use in actuators, sensors, and power generating devices without the use of lead, which is environmentally beneficial.
Implementation Method 1
Piezoelectric materials can mutually convert the electrical energy and mechanical energy by their own intrinsic functions (properties)
Data Source
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AI summary
Providing a piezoelectric device excellent in both transmission and reception capabilities and appropriate for use as a piezoelectric actuator, a sensor, an ultrasonic sensor, or a power generating device. A piezoelectric device (1) which includes a piezoelectric body (13) having piezoelectricity and a pair of electrodes (12, 14) for applying an electric field to the piezoelectric body in a predetermined direction in which a piezoelectric strain constant d33 (pm/V) and a relative permittivity ε33 of the piezoelectric body satisfy Formulae (1) and (2) below. 100<ε33<1500 d33pm/V>12√ε33