GB/T 6426-2025 Quasi-static test method for ferroelectric hysteresis loop in ferroelectric ceramics English, Anglais, Englisch, Inglés, えいご
ICS 31.030 CCS L 90
National Standard of the People's Republic of China
GB/T 6426-2025 Replaces GB/T 6426-1999
Quasi-static Test Method for Ferroelectric Hysteresis Loop in Ferroelectric Ceramics
Issued on August 29, 2025; Implemented on March 1, 2026
Issued by the State Administration for Market Regulation and Standardization Administration of China
Contents
Foreword
1 Scope
2 Normative References
3 Terms and Definitions
4 Test Principle
5 Test Equipment
6 Test Samples
7 Test Conditions
8 Test Procedure
9 Calculation of Performance Parameters
10 Test Report
Quasi-static Test Method for Ferroelectric Hysteresis Loop in Ferroelectric Ceramics
1 Scope
This document specifies the quasi-static test method for measuring the hysteresis loop of ferroelectric ceramic materials. It is applicable to determining material parameters such as coercive electric field strength (Ec), remnant polarization (Pr), and spontaneous polarization (Ps) from the obtained hysteresis loop.
2 Normative References
The following documents contain provisions that, through normative citations, constitute essential requirements of this document. For dated references, only the cited version applies; for undated references, the latest version (including amendments) applies.
GB/T 3389.1-1996 Vocabularies for Ferroelectric and Piezoelectric Ceramics
3 Terms and Definitions
Terms and definitions defined in GB/T 3389.1-1996 apply to this document.
4 Test Principle
Under alternating electric fields, the polarization (P) of ferroelectric ceramic materials exhibits nonlinear variation with external electric fields. Within a certain temperature range, P becomes a double-valued function of electric field intensity (E), showing hysteresis behavior and forming the hysteresis loop (Figure 1).
As shown in Figure 1, with increasing electric field, polarization (P) nonlinearly increases along curve OB. Further field increase causes P to saturate slowly along curve BC, reaching saturation polarization. The tangent of BC intercepts the P-axis at spontaneous polarization (Ps) under zero field. After field removal, P retains a remnant value (Pr). The reverse field required to reduce P to zero is the coercive field (Ec). Further reverse saturation (point H) and subsequent field reduction complete the loop (HF). Key parameters—Ps, Pr, and Ec—are derived from loop analysis.
