1 ] ▁reve als ▁C d ▁and ▁Z n ▁altern ating ▁plan es . ▁Figure ▁ 1 ▁below ▁shows ▁sch emat ically ▁the ▁ordering ▁mentioned : ▁ ▁Figure ▁ 1 . ▁Example ▁of ▁Cu - P t ▁type ▁ordering ▁in ▁C d Z n Te ▁al loy ▁ ▁( fig ures ▁cour tes y ▁of ▁Journal ▁of ▁Material s ▁Science ▁Let ters ▁ 2 2 , ▁ 2 0 0 3 , ▁ 1 2 6 3 – 1 2 6 7 ) ▁ ▁This ▁ordering ▁reduces ▁the ▁lattice ▁symmetry ▁ordering ▁to ▁L 1 1 ▁and ▁leads ▁to ▁change ▁of ▁its ▁optical ▁and ▁elect rical ▁properties . ▁The ▁apparent ▁effects ▁are : ▁band ▁gap ▁reduction , ▁val ence ▁band ▁splitting , ▁and ▁optical ▁an is ot ropy . ▁For ▁instance , ▁in ▁Cu P t ▁type ▁B ▁ordering , ▁the ▁L ▁point ▁of ▁the ▁Br ill ou in ▁zone ▁fol d ▁back ▁to ▁the ▁ Γ - point , ▁and ▁the ▁fol ded ▁band ▁“ rep els ” ▁the ▁original ▁condu ction ▁band ▁minimum ▁and ▁bring ▁down ▁the ▁bottom ▁of ▁condu ction ▁band . ▁ ▁References ▁Check ▁Cry st Eng Comm , ▁ 2 0 0 9 , ▁ 1 1 , ▁ 1 0 6 8 – 1 0 7 2 ▁for ▁more ▁information ▁regarding ▁this ▁type ▁of ▁ordering ▁ ▁Category : C ry stal log raph y <0x0A> </s> ▁W ulf ▁Z end ik ▁( born ▁Lawrence ▁E . ▁W ulf ing , ▁in ▁El ▁Pas o , ▁Texas , ▁October