ISO 11894-1:2013 PDF

Overview

ISO 11894-1:2013 specifies a standardized test method for measuring ionic conductivity of oxide-ion-conducting solid electrolytes in fine ceramics (advanced ceramics) using the AC 4‑terminal method. The Standard applies to materials with oxide‑ion transference numbers > 0.99 and a measurable conductivity range of 1 to 1 000 S·m⁻¹. All values are expressed in SI units. ISO 11894-1:2013 is intended for reproducible, comparable conductivity data used in R&D, product qualification and quality control of ion‑conductive ceramic electrolytes.

Key topics and technical requirements

• Measurement method: AC 4‑terminal (four‑electrode) impedance measurement (current outer terminals, voltage inner terminals).
• Material scope: Oxide‑ion conductors with ionic transference number > 0.99 (electrolytic conduction region).
• Conductivity range: 1 to 1 000 S·m⁻¹.
• Test-piece geometry & preparation:
  • Typical dimensions: minimum about 4 mm × 3 mm × 36 mm (commonly 4×3×40 mm).
  • Surface roughness Ra < 0.20 μm (report if exceeded).
  • At least three test pieces required.
  • Bulk density measured per ISO 18754.
• Electrodes:
  • Porous, reversible electrodes for oxygen exchange (Pt or Ag recommended).
  • Voltage terminals narrow (< 2 mm) and spaced 20 mm in the specimen center; current terminals wide and ≥5 mm from voltage terminals.
  • Electrode application options: fired conductive paste, sputtering, or vapor deposition; avoid silica‑based flux binders.
• Instrumentation & measurement system:
  • AC impedance meter with true 4‑terminal capability; input resistance > 1 MΩ and input capacitance