New DySrAlO_4 Compound Synthesis and Formation Process Correlations for LnSrAlO_4(Ln=Nd,Gd,Dy) Series

For the first time, Dy Sr AlO_4 of K_2NiF_4-type structure was synthesized. The parameters of Dy Sr AlO_4 elementary unit cell are determined as follows: a = 0.368(4) nm, c = 1.229(2) nm, V = 0.166(4) nm~3. The research of the complex aluminates Ln Sr Al O4(Ln = Nd, Gd, Dy) solid-state process demonstrated the change of the formation mechanism among Ln Sr AlO_4(Ln = Nd, Gd, Dy) series from Dy Sr AlO_4 oxide. The performed analysis provided a possibility to realize why chemists couldn't get Dy Sr AlO_4 for a long period of time.