Colossal Permittivity Materials as Superior Dielectrics for Diverse Applications

Abstract

Ever since the beginning of this century, many kinds of materials have been reported to demonstrate colossal permittivity (CP) or colossal dielectric constant exceeding 10 3 . Accordingly, such CP materials and their further modification and improvement to achieve enhanced CP performance for promising applications in modern electronics, sensors, energy storage, and multifunctional devices and so on have attracted extensive attention. In this review, 2 a general overview of the recent advances in CP materials is provided, ranging from their various categories, physical mechanisms, and modulation methods to promising applications.First, various classes of CP materials are categorized in terms of their structures and dielectric properties. Subsequently, this review provides an insight into the CP mechanisms in views of barrier layer capacitance, defect-dipole cluster and polaronic effect. Moreover, the strategies and prototypical works are introduced in some aspects, including the manipulation of CP properties by doping, percolative capacitors and the methods employed to enhance the dielectric behaviors in CP materials with different forms. We then discuss a wide range of applications based on CP materials, such as modern electronics and energy storage. Finally, the challenges and opportunities for further investigation of CP materials are highlighted in the summary and future perspectives.

Metastable oxygen vacancy ordering state and improved memristive behavior in TiO2 crystals

“…In this work, the V O s' behavior of TiO 2 single crystals was studied in detail above room temperature. TiO 2 was used as a model system because the behavior of V O s in TiO 2 is important for memristive/resistive switching [11], photocatalytic applications [12], light absorption [13], and colossal dielectric permittivity [14]. The ordering state of V O s in TiO 2 , known as Magnéli phases with the generic formula Ti n O 2nÀ1 (n is integer), has been the subject of considerable research to date [15,16].…”

Colossal Permittivity and Multiple Effects in (Zn + Ta) co-doped TiO2 Ceramics

“…With the continued development of microelectronics information technology, the colossal permittivity (CP) materials have received unprecedented attention [1][2][3]. In the past decades, a series of emerging CP materials have been prepared and then further modified to achieve high CP for practical applications including BaTiO3, CaCu3Ti4O12 (CCTO),La2-xSrxNiO4, NiO, and (Pb, La)TiO3 [4][5][6][7][8][9][10].…”

Defect chemistry of A site nonstoichiometry and the resulting dielectric behaviors in SrxTi0.985(Nb2/3Zn1/3)0.015O3 ceramics

“…The enhancement of permittivity provides a direct and effective method to improve the capacitance required for practical application. Colossal permittivity (CP) materials with low tan δ and high thermal/frequency stabilities are expected to further enhance the integration of microelectronic, energy storage, and multifunctional equipment 4−5 . Unfortunately, conventional CP materials such as CaCu 3 Ti 4 O 12 (CCTO), NiO, LaSrNiO 4 , and BaTiO 3 are usually accompanied by high dielectric loss and/or poor stabilities, failing to meet the practical requirements.…”