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Article Abstract
Among the KCoO-type phases, the orthorhombic layered nitride CaTiN is a newly reported high dielectric permittivity material (ε ∼ 1300-2500 within 10-10 Hz from 80 to 450 K) while the tetragonal SrTiN is reported to display an unintentional metallic conduction property. In this work, a CaSrTiN solid solution was synthesized, in which the insulating SrTiN end member and some Sr-doped CaTiN samples were successfully obtained, and therefore, the dielectric properties of the CaSrTiN solid solution were investigated. The Sr substitution for Ca drove an orthorhombic-to-tetragonal phase transformation in CaSrTiN, which reduced the dielectric permittivity significantly. The tetragonal SrTiN displays a much lower dielectric permittivity (ε ∼ 20-70 in 10-10 Hz and 10-300 K) than that of CaTiN. The comparison on the dielectric permittivities and structures of CaTiN and SrTiN indicates that the structural distortion arising from the splitting of N planes between Ti layers within the TiN pyramidal layers could be a plausible structural origin of the high bulk dielectric permittivity of CaTiN.
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