A crystal (lattice) structure is the regular, repeating three-dimensional arrangement of ions in an ionic solid. The pattern repeats throughout the crystal, maximising attractions between oppositely charged ions and minimising repulsions. This ordered arrangement is responsible for the characteristic shapes and high melting points of ionic solids.

晶体(晶格)结构是离子固体中离子规则重复的三维排列。该图样在整个晶体中重复,使带相反电荷离子之间的吸引最大、排斥最小。这种有序排列造成了离子固体特有的外形和高熔点。