The optical transmittance of pressureless sintered KZr2P3O12 (KZP) cer
amics was studied in the ultraviolet, visible light, and near infrared
spectrum ranges. Thermal expansion, strength, a nd therm a I shock re
sistance of the ceramics were also studied. KZP ceramics with differen
t additives (0-8 wt % of MgO, ZnO or SrO) show a 30-70% transmittance
from 0.4-2 mu m, a low thermal expansion coefficient and high thermal
shock resistance. These polyfunctional ceramics might be useful as opt
ical windows.