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)