The use of high pressure stabilizes products with the following attributes:

(a) Dense packing of ions (Higher cation coordination numbers)

For example when prepared under ambient conditions the compounds
Na₂ MTeO₆ (M = Ti⁴⁺, Sn⁴⁺) crystallize with the ilmenite structure. Upon treatment at high temperature (1000°C) and pressure (40-70 kbar ) in a multi-anvil device, both of these compounds transform to the perovskite structure, which is one of the most efficiently packed ternary oxide structures known.

(b) Higher cation oxidation states

For example at ambient pressure the reaction between calcium oxide and iron oxide leads to the formation of CaFeO _2.5 , with the Brownmillerite structure and iron in the +3 oxidation state. But upon treatment with high oxygen pressures in a belt or piston-cylinder device the perovskite CaFeO₃, with iron in the +4 oxidation state is stabilized.