crystalline electrodes

Also contains definitions of: heterogeneous membrane electrode, homogeneous membrane electrode
https://doi.org/10.1351/goldbook.C01431
Electrodes which contain mobile ions of one sign and fixed sites of opposite sign. They may be homogeneous or heterogeneous.
  1. Homogeneous @[email protected] electrodes are ion-selective electrodes in which the @[email protected] is a crystalline material prepared from either a single compound or a homogeneous mixture of compounds (i.e. Ag2S, AgI / Ag2S).
  2. Heterogeneous @[email protected] electrodes are formed when an active substance, or mixture of active substances, is mixed with an @[email protected] matrix, such as silicone rubber or PVC, or placed on hydrophobized @[email protected] or conducting epoxy, to form the heterogeneous sensing @[email protected]
Source:
PAC, 1994, 66, 2527. (Recommendations for nomenclature of ionselective electrodes (IUPAC Recommendations 1994)) on page 2534 [Terms] [Paper]