Fluorite & Perovskite

5. alternate name for the fluorite mineral (probably from the french for "blue and yellow")
8. type of crystal structure with more than 2 atom types
9. crystal structure with general form ABX3 (CaTiO3); Pm3̅m
10. bravais lattice for fluorite and perovskite
11. next-gen nuclear waste immobilization material, extremely low leach rates; based on perovskite structure
12. heating a material allows electrons trapped in high-energy states to drop down
15. crystal structure with general form A2X (Li2O)
16. layered superconductor oxide; must be gradually doped with oxygen

1. spontaneous electric polarization in the absence of an applied electric field
2. temperature above which materials lose their permanent polarization; many ferroelectrics have perovskite structure above it
3. link between electric field and mechanical deformation of the unit cell; PZT is exemplar material; can cause polarization
4. location oxygen vacancies tend to concentrate; high-energy structural disorder
6. excited electrons emit energy as light as they return to ground state
7. crystal structure with general form AX2 (CaF2); Fm3̅m
13. used as a material for nuclear fuel pellets because of the large central vacancy
14. decrease in electrical resistance in response to an applied magnetic field; important for microelectronics