Conductivity-permittivity relations in oxygen deficient CaCu3Ti4O12

Luo, Xia; Bärner, K.; Zhang, Y.T.; Gao, Tian; Yang, Changping; Liu, Y.S.

doi:10.1016/j.ceramint.2018.03.169

Cited by 6 publications

(1 citation statement)

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“…Especially, oxygen vacancies play an important role in the conduction and dielectric polarization of CCTO. [16][17][18] Afterwards, we have to think whether the magnetic properties of CCTO as a member of perovskite transition metal oxide family which usually has rich electric or magnetic physical properties, are affected by oxygen vacancy-related defects. In the study of titaniumbased diluted magnetic semiconductor, such as TiO 2 , many researchers have demonstrated the contributions of oxygen vacancy defects to the room temperature ferromagnetism.…”

Section: Introductionmentioning

confidence: 99%

Low temperature ferromagnetism in CaCu₃Ti₄O₁₂ *

Yang¹,

Luo²,

Shen³

et al. 2021

Chinese Phys. B

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The low-temperature magnetic order behaviors of perovskite oxide CaCu3Ti4O12 (CCTO) ceramics prepared by different methods are discussed. X-ray diffraction, scanning electron microscope, x-ray photoelectron spectroscopy, and direct current (DC) magnetization are used to characterize the structures, microscopic morphologies, valence states, and magnetic properties of the samples. The results show that the magnetic behaviors of CCTO ceramics are very sensitive to the preparation process. The quenched CCTO ceramic and CCTO powders grown in a molten salt crystal, which contain much more oxygen vacancies and Ti3+, show the coexistence of weak ferromagnetic order and antiferromagnetic order below the Neel temperature. It suggests that the bound magnetopolaron formed by oxygen vacancies and Ti3+ ion composite defects are responsible for the weak ferromagnetic order at low temperature.

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Section: Introductionmentioning

confidence: 99%