Topochemical polymerization is the only polymerization technique whose product has this property. Hydrothermal synthesis uses an autoclave to make materials with this property. A sample can (-5[1])be purified and given this property by heating it in a narrow region moving upward from the bottom in zone melting. Materials with this property can be made by the Bridgman–Stockbarger and (*) Czokralski methods. Having this property distinguishes boules from other ingots. Most semiconductor manufacturing requires silicon wafers that have (-5[1])this property. (10[1])Making solids with this property requires that cooling or evaporation be slow to reduce growth (10[1])rate and may be aided by a small “seed” with this property. For 10 points, name (10[1])this property in which a solid lacks (-5[1])grain boundaries so that the entire solid is one lattice. ■END■ (10[1]0[4])