Results showed: the average ionic energy of NaCl crystal decreased with crystal size; When the crystal was large enough, the average ionic energy reach a value 1 74732496, which was reported as Madelung constant.

• 结果表明 :NaCl晶体的平均离子势能随晶体增大而变低 ,晶体足够大时趋于恒定值 1 74732 496 ,此即NaCl晶体的Madelung (马德隆 )常数