Influence of octahedral tilting on the microwave dielectric properties of A3LaNb3O12 hexagonal perovskites (A=Ba, Sr) - Rawal,R; McQueen,AJ; Gillie,LJ; Hyatt,NC; McCabe,EE; Samara,K; Alford,NM; Feteira,A; Reaney,IM; Sinclair,DC (APPLIED PHYSICS LETTERS, 2009)