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As a quasi-one-dimensional spin frustrated material, Ca3Co2O6 has a series of interesting physical properties due to its unique structure, such as low temperature spin freezing, multiple magnetized steps. The magnetic properties of Ca3Co2O6 mainly come from Co ions, and the doping of different elements at the Co site has a great effect on the magnetic structure of Ca3Co2O6. At present, the magnetic research of Ca3Co2O6 and the related compounds is mainly on exploring the influence of other elements replacement at Co sites. For example, non-magnetic Sc3+ can dilute the intrachain ferromagnetic exchange, while magnetic ions Mn4+, Fe3+ or Cr3+ doping can inhibit the intrachain ferromagnetic interaction and enhance the antiferromagnetic interchain interaction. As a high-valence non-magnetic ion, Ti4+ doping not only dilutes the magnetic interaction of Ca3Co2O6, but also changes the valence state of cobalt ions. I.e., it can change part of Co3+ to Co2+. Therefore, comparing with other doped ions, its introduction may have a more significant effect on the magnetoelectric properties of Ca3Co2O6. In this study, a series of Ca3Co2-xTixO6 (x = 0, 0.02, 0.04, 0.06) polycrystalline samples were prepared by sol-gel method. Their magnetic, dielectric and magnetodielectric properties were measured. The XRD patterns show that a small amount of Ti4+ does not change the crystal structure of Ca3Co2O6. Due to the destruction of non-magnetic Ti4+ ions to the long-range ferromagnetic correlation of Ca3Co2O6, the ferromagnetic interaction is inhibited at some extend. However, due to Ti4+ ions are non-magnetic ions, it cannot form antiferromagnetic coupling with Co ions. It only results in the decrease of the Curie-Weiss temperature(θ). The positive θ value and exchange constant still indicate that the ferromagnetic interaction is dominant in Ti4+ doped Ca3Co2-xTixO6 (x = 0, 0.02, 0.04, 0.06) samples. The substitution of non-magnetic ions Ti4+ for Co3+ ions also makes the effective magnetic moment of Ca3Co2-xTixO6 (x = 0, 0.02, 0.04, 0.06) monotonically decrease from μeff= 5.42μB for x = 0 to μeff = 5.18μB for x = 0.06. Accompanying the introduction of Ti4+ ion, the spin frustration of Ca3Co2O6 is released partly. The magnetization steps of Ca3Co2O6 thus fade gradually. As the Ca3Co2O6 is a typical magnetodielectric material, the released spin frustration in Ti4+ doped samples and the variation of the subtle magnetic structure present a large influence on the magnetodielectric coupling effect of Ca3Co2-xTixO6 (x = 0, 0.02, 0.04, 0.06) compounds.
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