This standard specifies the test method for the Curie temperature Tc of piezoelectric ceramic materials. This standard is applicable to the test of the Curie temperature Tc of piezoelectric ceramic materials. GB/T 3389.3-2001 Test method for performance of piezoelectric ceramic materials Test of Curie temperature Tc GB/T3389.3-2001 Standard download decompression password: www.bzxz.net

GB/T3389.3—2001
This standard is based on GB/T3389.3—1982 "Test Methods for Performance of Piezoelectric Ceramic Materials".
Compared with GB/T3389.3—1982, this standard has been revised as follows: 1 This standard adopts the mutation point of the test sample's permittivity to determine the Curie temperature Tc of the piezoelectric ceramic material. At the same time, it is recommended to use an impedance analyzer to test this mutation point;
2 Delete Appendix A Phase Transformer Measurement Method and Appendix B Transmission Line Measurement Method 3 Delete the provision that the two main planes of the sample are all covered with a metal layer as electrodes, and add the recommended sample size: @20mm×1mm.
This standard replaces GB/T3389.3—1982 from the date of implementation. This standard is proposed by the National Technical Committee for Standardization of Ferroelectric Piezoelectric Ceramics. This standard is under the jurisdiction of the National Technical Committee for Standardization of Ferroelectric Piezoelectric Ceramics. Drafting unit of this standard: State-owned No. 721 Factory. The main drafters of this standard are Luo Shaotang and Eugene Han. I
1 Scope
National Standard of the People's Republic of China
Test methods for the properties of piezoelectric ceramics-Test for Curie temperature Tc
Test methods for the properties of piezoelectric ceramics-Test for Curie temperature Te This standard specifies the test method for the Curie temperature Tc of piezoelectric ceramic materials. This standard is applicable to the test of the Curie temperature Tc of piezoelectric ceramic materials. 2 Referenced standards
GB/T 3389.3—2001
Replaces GB/T3389.3—1982
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T3389.1—1996 Vocabulary of Ferroelectric and Piezoelectric Ceramics 3 Definitions and Symbols
The definitions and symbols used in this standard shall be in accordance with the provisions of GB/T3389.1. 4 Test Principle
The Curie temperature is a parameter that characterizes the ferroelectric properties of piezoelectric ceramic materials. Piezoelectric ceramics have different phase structures in different temperature ranges. The temperature at which phase transition occurs is defined as the phase transition temperature, and the highest phase transition temperature is called the Curie temperature. Above the Curie temperature, piezoelectric ceramics are in the paraelectric phase, and spontaneous polarization and piezoelectricity disappear. At the Curie temperature, many physical properties of piezoelectric ceramic materials, such as permittivity, heat capacity, and linear expansion coefficient, will undergo sudden changes. Therefore, the Curie temperature of piezoelectric ceramic materials can be determined by measuring the temperature corresponding to this mutation point. This standard uses the test specimen permittivity mutation point to determine the Curie temperature Tc of piezoelectric ceramic materials, and recommends the use of an impedance analyzer to measure this mutation point. bzxz.net
5 Specimen Requirements
The specimen is an unpolarized sheet with electrodes. The specimen should be kept clean and dry. Recommended sample size: Φ20mm×1mm.
6 Test method
6.1 Test circuit
The schematic diagram of the test circuit is shown in Figure 1.
Approved by the General Administration of Quality Supervision, Inspection and Quarantine of the People’s Republic of China on November 16, 2001 and implemented on August 1, 2002
6.2 Test equipment and requirements
Recorder
Impedance analyzer
Thermocouple
6.3 Test procedure
GB/T 3389.3—2001
1-Recorder 2-Impedance analyzer 3-Electric furnace 4-Test sample 5-Thermocouple Figure 1 Block diagram of Curie temperature test circuit
The measurement error is not more than 1%;
The frequency variation is not more than ±0.5%, the output signal fluctuation is not more than ±1%, and the temperature in the furnace is uniform and controllable;
The measurement error is not more than 1%.
a) Place the sample in the furnace. The position of the thermocouple in the electric furnace should be able to truly reflect the temperature of the sample; b) Connect the circuit according to the test circuit shown in Figure 1, adjust the frequency of the impedance analyzer to a certain value, and then maintain its frequency unchanged; the electric furnace slowly heats up (or cools down). Under normal circumstances, the heating (or cooling) rate of the electric furnace is 3℃/min~4℃/min, and the rate near the Curie temperature is 1℃/min~2℃/min;
c) Read the peak value of the capacitance or susceptance versus temperature curve on the recorder. The temperature corresponding to this peak value is the Curie temperature of the material. If there is more than one peak on the curve, the corresponding temperatures are all phase change temperatures, and the highest phase change temperature is the Curie temperature. 2
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