Effect of oxygen content on dielectric characteristics of Cr-doped LaTiO_x

【摘要】 The ceramics La_0.85Cr_0.15TiO_x and La_0.7Cr_0.3TiO_x are prepared by conventional solid-state reaction method. The dielectric properties of Cr-doped La TiO_x as a function of frequency（0.1 k Hz ≤ f ≤ 1 MHz） and temperature（77 K ≤ T ≤360 K） are studied. The blocks are then annealed in a flowing O₂ or Ar/H₂ to convert their oxygen content and the tests mentioned above are performed. The highly oxygenated samples exhibit extremely high low-frequency dielectric constants at room temperature（～10⁶）. The results show that the oxygen stoichiometry could significantly influence the dielectric properties of Cr-doped LaTiO_x.更多还原

【Abstract】 The ceramics La_0.85Cr_0.15TiO_x and La_0.7Cr_0.3TiO_x are prepared by conventional solid-state reaction method. The dielectric properties of Cr-doped La TiO_x as a function of frequency（0.1 k Hz ≤ f ≤ 1 MHz） and temperature（77 K ≤ T ≤360 K） are studied. The blocks are then annealed in a flowing O₂ or Ar/H₂ to convert their oxygen content and the tests mentioned above are performed. The highly oxygenated samples exhibit extremely high low-frequency dielectric constants at room temperature（～10⁶）. The results show that the oxygen stoichiometry could significantly influence the dielectric properties of Cr-doped LaTiO_x.更多还原