The electrical conductivity of gadolinium gallium garnet single crystals pure and doped with Ca2+ and Mg2+ is measured from room temperature to 700 °C at different ambient atmospheres. Between 100 and 350 °C the activation energies are 1.1 eV for pure crystals and 0.88 eV for doped crystals. At higher temperatures the activatin energies are 1.53 and 0.5 eV, respectively. A p‐type conduction is attributed to O− centres. Significant surface conductivity is observed at lower temperatures.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics