GB/T 11297.8-2015 in English
VALIDTest method for pyroelectric coefficient of pyroelectric materials
- Issued on:2015-12-31
- Implemented on:2016-07-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$88.00
本部分规定了热释电材料本征热释电系数的测量方法。
本部分适用于测量钽酸锂、钛酸铅、锆钛酸铅、铌镁酸铅等热释电材料的热释电系数。本部分也适用于热释电系数在1×10-11C/(cm2・℃)数量级以上其他陶瓷、单晶和有机热释电材料等的测量。本部分不适用于钛酸锶钡、钽钪酸铅等场致热释电材料的热释电系数测量。
Introduction
1. Standard background and scope of application
GB/T 11297.8-2015 "Test method for pyroelectric coefficient of pyroelectric materials" is an important test standard for pyroelectric materials, used to measure the pyroelectric coefficient of materials such as lithium neutronium oxide and lead titanate. This standard replaces the 1989 version, and the main revisions include the expansion of the scope of application, the update of equipment requirements, and the improvement of measurement accuracy.
2. Measurement principle and formula
This standard uses the charge integration method to calculate the pyroelectric coefficient by measuring the voltage change on the integral capacitor. The test principle is based on the following formula:
ΔV₀ = ΔP_r · A / C₁φ_T = (C₁ / A) · (dV₀/dT)
3. Standard Framework Comparison Table
| Dimensions | Requirements of the 1989 edition | Updated in the 2015 edition |
|---|---|---|
| Scope of application | Limited to specific pyroelectric materials | Extended to more ceramics and single crystal materials |
| Specimen size | No specific requirements | Specified area is 10-50 mm², thickness 0.1-1.0 mm |
| Test accuracy | Not specified | Requires the voltage measuring instrument error not to exceed ±0.05% |
4. Implementation suggestions
Case study: When testing lead zirconate titanate material, a laboratory selected a sample with an area of 30 mm² and a thickness of 0.5 mm according to the standard requirements, and used a polystyrene integrating capacitor (1 μF) and a nickel-chromium-nickel-silicon thermocouple (grading number K). The test results showed that the pyroelectric coefficient of the material at 25°C was 8 × 10⁻¹¹ C/(cm²·°C), which met the standard requirements.
Suggestions:
- Process the sample strictly according to the sample preparation requirements to ensure that the surface is flat and clean;
- Select instruments and equipment that meet the accuracy requirements and calibrate them regularly;
- Operate in a dry environment to prevent the sample from being affected by moisture and affecting the test results.
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