The effect of Cr2O3, Nb2O5 and ZrO2 doping on the dielectric properties of CaCu3Ti4O12

Kwon, Seunghwa; Huang, Chien-Chih; Patterson, Eric A.; Alberta, Edward F.; Kwon, Seongtae; Hackenberger, Wesley S.; Cann, David P.

doi:10.1016/j.matlet.2007.06.042

Cited by 99 publications

(53 citation statements)

References 20 publications

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“…[261][262][263] There is an exemplary illustration of the dielectric properties of Ca 0.25 Cu 0.75 TiO 3 with doped metallic iron (CCTO/Fe), zirconia (CCTO/Zr) and, for comparison, CCTO prepared by high-temperature treatment (CCTO/T) below. [263][264][265][266] The mechanism of the impact through applying mechanical activation is based on the understanding that the mechanical energy is almost entirely transformed into thermal energy, whereupon some physical and chemical processes are initiated. In this sense, the MCS of complex oxides can be regarded as a process of ''quasi-adiabatic'' accumulation and distribution of energy in a solid-state body as a consequence of the mechanical treatment, possessing sufficient intensity of the impulse impact in a small volume for a very short time interval.…”

Section: Other Oxidic Systemsmentioning

confidence: 99%

Hallmarks of mechanochemistry: from nanoparticles to technology

et al. 2013

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The aim of this review article on recent developments of mechanochemistry (nowadays established as a part of chemistry) is to provide a comprehensive overview of advances achieved in the field of atomistic processes, phase transformations, simple and multicomponent nanosystems and peculiarities of mechanochemical reactions. Industrial aspects with successful penetration into fields like materials engineering, heterogeneous catalysis and extractive metallurgy are also reviewed. The hallmarks of mechanochemistry include influencing reactivity of solids by the presence of solid-state defects, interphases and relaxation phenomena, enabling processes to take place under non-equilibrium conditions, creating a well-crystallized core of nanoparticles with disordered near-surface shell regions and performing simple dry time-convenient one-step syntheses. Underlying these hallmarks are technological consequences like preparing new nanomaterials with the desired properties or producing these materials in a reproducible way with high yield and under simple and easy operating conditions. The last but not least hallmark is enabling work under environmentally friendly and essentially waste-free conditions (822 references).

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Section: Other Oxidic Systemsmentioning

confidence: 99%

Hallmarks of mechanochemistry: from nanoparticles to technology

et al. 2013

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“…Many studies have been performed to reduce tan d while retaining a high e¢ value. 6,[15][16][17][18][19] Normally, most strategies selected to improve a particular dielectric property, e.g., to reduce tan d or enhance e¢, simultaneously worsen other important dielectric properties of these materials. 15,17,20 An increase in e¢ or strong reduction of tan d is generally accompanied by a strong increase in tan d or remarkable decrease in e¢, respectively; For example, 8 substitution of W 6+ into CCTO ceramics can reduce the low-frequency tan d value at room temperature.…”

Section: Introductionmentioning

confidence: 99%

Effect of Annealing in O2 and Mechanisms Contributing to the Overall Loss Tangent of CaCu3Ti4O12 Ceramics

Boonlakhorn

Thongbai

2015

Journal of Elec Materi

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Mechanisms contributing to the overall loss tangent (tan d) of CaCu 3 Ti 4 O 12 ceramics were investigated via doping with Yb 3+ ions and annealing in an O 2 atmosphere. A high tan d value for CaCu 3 Ti 4 O 12 ceramics in a low-frequency range was primarily caused by direct-current (DC) conduction. It can be greatly suppressed by annealing in an O 2 atmosphere to fill oxygen vacancies at grain boundaries (GBs) and enhance GB resistance. The tan d value in a middle frequency range originated from oscillation of ionic dipole moments. Ceramics which contain a relatively high atomic mass number (Yb 3+ -doped CaCu 3 Ti 4 O 12 ) generated more dissipated energy compared with undoped ceramics. A rapid increase in tan d in a high frequency range was attributed to the relaxation of active dipole moments that gave rise to the giant dielectric response. Balancing these factors, while simultaneously retaining high values of dielectric permittivity, is an ideal strategy to effectively improve the dielectric performance of CaCu 3 Ti 4 O 12 -based compounds.

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“…In the literature, the decrease in dielectric loss is attained by addition of impurities. [13][14][15][16][17][18][19] Thus, herein it was aimed to show the possibility of improving the nonOhmic behavior by suppressing the dielectric properties with the addition of Sn into the CCTO material. Moreover, the effects of doping were discussed considering dielectric relaxation processes and the mechanisms involved in the NBLC model.…”

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confidence: 99%

The dielectric suppress and the control of semiconductor non-Ohmic feature of CaCu3Ti4O12 by means of tin doping

Ribeiro¹,

Araujo²,

Bueno³

2011

Applied Physics Letters

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In this work it was demonstrated that the addition of Sn on CaCu3Ti4O12 material improved non-Ohmic behavior by suppressing dielectric properties. It was noted that the improvement of the varistor characteristics, monitored by the increase in nonlinear coefficient, occurs with the disappearance of the grain dielectric relaxation process with concomitant decreasing of both dielectric constant and dielectric loss values. By forming a solid solution, Sn4+ was incorporated into CaCu3Ti4O12 matrix deforming the crystal lattice and restricting the formation of polaronic stacking faults. Thus, the dielectric relaxation due to polaronic defects is believed to be the origin of the huge dielectric properties disappearance. This framework is in agreement with the nanosized barrier layer capacitor model.

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The effect of Cr2O3, Nb2O5 and ZrO2 doping on the dielectric properties of CaCu3Ti4O12

Cited by 99 publications

References 20 publications

Hallmarks of mechanochemistry: from nanoparticles to technology

Hallmarks of mechanochemistry: from nanoparticles to technology

Effect of Annealing in O2 and Mechanisms Contributing to the Overall Loss Tangent of CaCu3Ti4O12 Ceramics

The dielectric suppress and the control of semiconductor non-Ohmic feature of CaCu3Ti4O12 by means of tin doping

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