( ( Ionic ( -LRB- ( compound -RRB- ) ) ) ( ( lattices ( ( ( exhibit ( Schottky defects ) ) , ) ( ( in which ) ( ( a ( ( cation or ) anion ) ) ( is missing ) ) ) ) ) ; ) )
(ROOT (S (NP (NP (NNP Ionic)) (PRN (-LRB- -LRB-) (NP (NN compound)) (-RRB- -RRB-))) (VP (VBZ lattices) (NP (NP (NN exhibit) (NN Schottky) (NNS defects)) (, ,) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (NP (DT a) (NN cation) (CC or) (NN anion)) (VP (VBZ is) (ADJP (VBG missing))))))) (: ;)))
Ionic (compound) lattices exhibit Schottky defects, in which a cation or anion is missing;
(ROOT (S (SBAR (WHADVP (WRB When)) (S (VP (VBG naming) (NP (DT an) (JJ ionic) (NN compound))))) (, ,) (NP (DT the) (NN cation)) (VP (VBZ is) (VP (VBN written) (ADVP (RB first)))) (. .)))
When naming an ionic compound, the cation is written first.