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PDF MA80A1 Data sheet ( Hoja de datos )
| Número de pieza | MA80A1 | |
| Descripción | Piezoelectric Ceramics Sensors | |
| Fabricantes | Murata Manufacturing | |
| Logotipo |  |
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P19E7.pdf 02.6.26
Piezoelectric Ceramic Sensors (PIEZOTITEr)
PIEZOELECTRIC
CERAMICS
SENSORS
(PIEZOTITEr)
www.datasheet4u.com
Murata
Manufacturing Co., Ltd.
Cat.No.P19E-7
1 page  
!Note Please read rating and !CAUTION (for storage and operating, rating, soldering and mounting, handling) in this PDF catalog to prevent smoking and/or burning, etc.
This catalog has only typical specifications. Therefore, you are requested to approve our product specification or to transact the approval sheet for product specificaion before ordering.
P19E7.pdf 02.6.26
2 Characteristics of Piezoelectric Ceramics (PIEZOTITEr)
For using piezoelectric ceramics, it is important to first
have an adequate knowledge of the properties of different
piezoelectric materials before choosing a suitable type for
a specific application. The following sections describe the
major characteristic which need to be evaluated to
determine the properties of piezoelectric ceramic materials.
1. Resonant Frequency and Vibration Mode
If an AC voltage of varying frequency is applied to a piezo-
electric ceramic (piezoelectric transducer) of a certain
shape, it can be seen that there is a specific frequency at
which the ceramic produces a very strong vibration. This
frequency is called the resonant frequency, fr, and
depends on the ceramic's specific elastic vibration
(resonance) frequency, which is a function of the shape
of the material.
Piezoelectric ceramics have various vibration modes
(resonant modes) which depend on their shape,
orientation of polarization, and the direction of the
electric field. Each of these vibration modes have unique
resonant frequencies and piezoelectric characteristics.
Fig. 2 shows typical vibration modes in relation to the
shapes of ceramic materials, the resonant frequency in
each vibration mode, and the material constant symbols.
In Fig. 2, the piezoelectric material constant symbols
have the following meanings:
N :Frequency Constant (described in Section 1).
d :Piezoelectric Distortion Constant (described in Section 2).
g :Voltage Output Constant (described in Section 2).
k :Electromechanical Coupling Coefficient (described in Section 3).
YE :Young's Modulus (described in Section 5).
εT :Dielectric Constant (described in Section 8).
Vibration Mode
Shape/Vibration Mode
Resonant
Frequency
(fr)
k
Material Constant Symbol
d g YE εT
N
Radial Mode
Length Mode
EP
t
φ d d >15t
P : Direction of polarization
E : Direction of electric field
Thin disk with radial vibration mode. Polarization is
oriented along the thickness of the disk.
R
at
EP
R> 4a a > 3t
Thin rectangular plate, with the direction of vibration orthogonal
to the polarization axis and with a single point of resonance.
ab
φd
Np
d
N31
R
εkp
d31
g31 Y11E
T
33
Np
εk31
d31
g31 Y11E
T
33
N31
2
Longitudinal
Mode
RR
EP
R> 2.5a,2.5b,2.5d
Square and cylindrical columns. Vibration is oriented along the
direction of polarization. Only a single point of resonance.
Thickness Mode
R
ta t
φd
EP
10t V a,R,d
Disk and rectangular plates which are thin com-
pared to their surface areas. They have multiple
points of resonance in longitudinal vibration mode.
R
N33
R
Nt
t
εk33
d33
g33 Y33E
T
33
εkt
d33
g33 Y33E
T
33
Shear Mode
a
t
E
P R> a > t
Disk or rectangular plates, with the electric field orthogonal to the
direction of polarization, causing a shear vibration along the surface.
N15
t
εk15
d15
g15 Y44E
T
11
Fig. 2 Typical Vibration Modes, Resonant Frequencies, and Material Constant Symbols of Piezoelectric Ceramics
N33
Nt
N15
3
5 Page 
!Note Please read rating and !CAUTION (for storage and operating, rating, soldering and mounting, handling) in this PDF catalog to prevent smoking and/or burning, etc.
This catalog has only typical specifications. Therefore, you are requested to approve our product specification or to transact the approval sheet for product specificaion before ordering.
P19E7.pdf 02.6.26
Murata's Piezoelectric Ceramics (PIEZOTITEr) Materials 3
2. Features of PIEZOTITEr Materials
Table 2 shows the features of PIEZOTITEr materials.
Murata's piezoelectric ceramics include two types : barium
titanate (BaTiO3) and lead zirconate titanate
(PbTiO3·PbZrO3) Materials using lead zirconate titanate are
available with different properties suitable for different
applications.
Type
Barium
Titanate
Lead
Zirconate
Titanate
Type Number
Features
P– 3
P– 5E
P– 6C
P– 7
The major constituent of P-3 is barium titanate, with titanate additives to improve the characteristics at room temperature. While it
has a lower electromechanical coupling coefficient and Curie temperature compared to Lead Zirconate Titanate, it is practical in
underwater applications and has the advantage of economy. With these features, P-3 is best suited for use in fish finders or sonar.
Featuring a large electromechanical-coupling coefficient, mechanical Qm and minimal aging, P-5 is widely used for ultrasonic
cleaners, high-power ultrasonic transducers, and other acoustic power applications.
Features superior temperature characteristics of resonant frequency and minimal aging. P-6 is often used in ceramic filters,
ceramic resonators requiring high stability.
Features large electromechanical coupling coefficient, constant d and small mechanical Qm. P-7 has applicaitons in piezoelectric
buzzers, ultrasonic sensors, and other applications requiring non-resonance or broad bandwidth.
Table 2 Features of Piezoelectric Ceramics
3. Temperature Characteristics and Aging
Fig. 7 shows examples of temperature characteristics of vari-
ous materials.
Fig. 8 shows examples of aging characteristics of various
materials. These examples show small aging characteristics.
(a) Temperature dependence of dielectric constant
10,000
P-5E
8,000
6,000
P-3
P-6C
4,000
2,000
P-7
0
-50 0
50 100 150 200 250 300
Temperature(D)
(b) Temperature dependence of electromechanical coupling coefficient for radial vibration
(a) Aging characteristics of dielectric constant
Accelerated aging at 80D
Aging at room temperature
2,000
P-7
1,500
1,000
1
P-6C
P-3 P-5E
5 10
50 100
Number of Days
500 1,000
(b) Aging characteristics of electromechanical coupling coefficient for radial vibration
1.0
0.8
0.6
0.4
0.2
0
-50 0
P-5E P-7
P-6C
P-3
50 100 150 200 250 300
Temperature(D)
(c) Temperature dependence of frequency constant for radial vibration
0.8
P-5E
P-7
0.6
0.4
0.2
0 P-3 P-6C
1
5 10
50 100
500 1,000
Number of Days
(c) Aging characteristics of frequency constant for radial vibration
3,600
3,200
2,800
2,400
2,000
P-3
P-6C
P-5E P-7
1,600
-50 0
50 100 150 200 250 300
Temperature(D)
Fig. 7 Temperature Characteristics of Various Materials
3,000
P-3
2,500
2,000
1
P-5E
P-6C
P-7
5 10
50
Number of Days
100
500 1,000
Fig. 8 Aging Characteristics of Various Materials
3
9
11 Page | ||
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