Preparation, Structure, Magnetic, and Electrical Study of SrTiO3-x and LnSrBO4 Ln=La, Ce, Pr, Nd, Sm, Eu, B=V, Ga or Al

Abstract

<p> Oxygen deficient SrTiO3-x with x = 0.28(2) was prepared in single crystal form and found to have a perovskite structure with a small tetragonal distortion. The structure was studied by powder and single crystal X-ray diffraction and electron diffraction. No long range order of the oxygen vacancies could be detected. The transport studies show that SrTiO2.72 is a metallic conductor. </p> <p> Some new K2NiF4 - type compounds, PrSrVO4, SmSrVO4, EuSrVO4 and PrSrGaO4, were prepared and studied by powder diffraction methods. The crystal structures of LaSrVO4, CeSrVO4, PrSrVO4 and NdSrVO4 were refined from powder neutron diffraction data. Powder X-ray diffraction data for all the new compounds above and for EuSrAlO4 are presented here. </p> <p> Magnetic susceptibilities are reported for SrTiO2.72 which exhibits metal-like Pauli-paramagnetism, PrSrGaO4, NdSrGaO4, EuSrAlO4 and LnSrVO4 where Ln = La, Ce, Pr and Nd. </p>