Colossal dielectric and magnetodielectric effect in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>Er</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mtext>O</mml:mtext><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>nanoparticles embedded in a<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>SiO</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mro

Mukherjee, Sudip; Chen, C. H.; Chou, Cheng‐Chun; Tseng, K. F.; Chaudhuri, B. K.; Yang, H. D.

doi:10.1103/physrevb.82.104107

Cited by 29 publications

(8 citation statements)

References 40 publications

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“…LGS) with different doping concentrations in the absence of the magnetic field. All the curves have well-defined diffuse phase transition-like maxima at T m ~320 K characteristic with oxygen vacancy-induced dielectric relaxation, thoroughly discussed in our previously reported sections [16,20,39] of other rare earth systems. Interestingly, at higher magnetic Gd 2 O 3 doping concentrations, the LGS NP-glass composite systems show colossal enhancement of dielectric behavior near room temperature.…”

Section: Effect Of Different Rare Earth Oxides On the Dielectric Propsupporting

confidence: 56%

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RE2O3 Nanoparticles Embedded in SiO2 Glass Matrix — A Colossal Dielectric and Magnetodielectric Response

Mukherjee¹,

Kao²,

Wu³

et al. 2015

Ferroelectric Materials - Synthesis and Characterization

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Significant experimental effort has been inspected to consider and implement favorable high-k gate dielectrics with magnetodielectric (MD) effect of series of rare earth oxide (RE 2 O 3 , RE ~ rare earth ions) nanoparticles (NPs) embedded in sol-gel derived SiO 2 glass matrix. Properly calcined RE 2 O 3 NP-glass composite systems (in which RE ~ Sm, Gd and Er) show an intriguing colossal enhancement of dielectric constant along with MD effect near room temperature. The enhancement of dielectric constant is closely related to oxygen vacancy induced dielectric relaxation (or, more correctly, particle size effect from different calcined temperature), reconstructed from extended X-ray absorption fine structure. The MD response is strongly depended on the superparamagnetic property of the rare earth ions. From application point of view, the enhancement of dielectric constant associated with MD response can be achieved by tuning the NPs size through varying annealing temperature and/or increasing the doping concentration of magnetic rare earth oxide, which will be the key guidelines to accomplish the compatibility, performance and reliability requirements for future complementary metal-oxide-semiconductor (CMOS) technology.

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Section: Effect Of Different Rare Earth Oxides On the Dielectric Propsupporting

confidence: 56%

“…In obtaining the EXAFS function χ(k), the background absorption features which were superimposed on the EXAFS oscillations were removed from the spectrum using spline fit to both the pre-edge and the postedge regions. [20]. Here, we discuss the TEM image of the powder specimen of typical Er05-8 ( Figure 2…”

Section: Methodsmentioning

confidence: 99%

RE2O3 Nanoparticles Embedded in SiO2 Glass Matrix — A Colossal Dielectric and Magnetodielectric Response

Mukherjee¹,

Kao²,

Wu³

et al. 2015

Ferroelectric Materials - Synthesis and Characterization

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“…In terms of equation ( 12), the resistance of the layers with the MR effect is changed by external magnetic field, the capacitance of MW interfacial relaxation system will inevitably change accordingly with the external magnetic field, resulting in an extrinsic MD effect. In spite of an extrinsic mechanism, such giant MD effects could be acquired simply and readily, and may be more practical for technological applications [127,128,132,145,256,259,310,311,313,314,316,318]. Such MD phenomena also appear in multiferroic hetero-systems [127,128,132,145,256,259,310,311,313,314,316,318].…”

Section: Artificial Interfaces Of Multiferroic Oxidesmentioning

confidence: 99%

Dielectric phenomena of multiferroic oxides at acoustic- and radio-frequency

Yang

Bai

Zhang

et al. 2023

J. Phys.: Condens. Matter

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In this review, an overview of acoustic- and radio-frequency frequency dielectric properties of multiferroic oxides, the significant dynamic response of electrical polarization to small external ac electrical fields, are present based on the reports in literatures and our recent experimental progresses. The review is begun with some basic terms, concepts and mechanisms associated with dielectric response and dielectric anomalies, namely dielectric peak and plateau upon varying temperatures and dielectric relaxations upon varying frequencies. Subsequently, a variety of quantitative analyses and descriptions of various dielectric effects, including dielectric relaxation, relaxational and transport dynamics, ac conductivity, equivalent circuit models and impedance spectroscopy, are summarized in details. Next is the kernel section. We thoroughly outline various physical mechanisms behind acoustic-/radio-frequency dielectric responses and anomalies of multiferroic oxides. Spin order transition/spin rotation, charge disorder-order transition, exchange striction of the spin interactions, spin-dependent p-d hybridization mechanism, quantum electric-dipole liquids, the interaction of spin order and quantum paraelectric, the motions of charged defects and carriers, quasi-intrinsic and extrinsic heterogeneous interfaces, polar relaxor and multiglass, ferroic domain wall/boundary motions, etc, are involved in these mechanisms. Meanwhile, particular emphasis is placed on intrinsic or extrinsic magnetodielectric effects and related mechanisms in multiferroic oxides. Finally, the review ends with a short perspective of future dielectric research in multiferroic oxides. This review is able to provide the detailed and unique insights into abundant underlying fundamental physics in multiferroic oxides as well as the potential multiferroics-based technological applications.

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“…In SiO 2 RE 2 O 3 systems, the RE-rich phases are often not crystallized [138,139]. This phenomenon has been utilized to form Fe 2 O 3 [140], CeO 2 [141], Er 2 O 3 [142], and Cr 2 O 3 [143] nanoparticles, and their optical and magnetic properties have been examined. The formation of CeO 2 nanoparticles has been investigated along with the scintillation properties of coexistent Ce 3+ ions [141,144].…”

Section: Incorporation Of Nanoparticlesmentioning

confidence: 99%

Recent advances in sol–gel synthesis of monolithic silica and silica-based glasses

Kajihara

2013

Journal of Asian Ceramic Societies

132

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Studies on sol-gel synthesis of monolithic silica and silicate glasses are summarized. Major research efforts have been devoted to avoid the fracture problems, associated with the extensive shrinkage of wet gels during drying. Supercritical drying, incorporation of silica fillers, and reduction of the surface tension of pore liquid have been used to form monolithic dried gels without fracture. More recent studies have shown that wet gels derived from alkoxides can be dried in a relatively short time without fracture at ambient pressure, by employing controlled drying accompanied by the cavitation of the pore liquid, macroscopic phase separation in parallel with gelation, and fluorine modification. By optimizing the synthesis procedure, it is also possible to reduce the use of reagents such as external alcohols, organic solvents, and other additives, which are removed during synthesis and are unnecessary in the final products. Another subject of considerable interest is the development of silica-based functional glasses that are difficult to form by conventional melt-quench and vapor-phase methods, by taking advantage of melt-free processes conducted at relatively low temperatures. Most of the recent studies on the functionalization of sol-gel-derived silica glasses are concerned with the doping of nanoparticles, rare earth ions, and/or fluorine.

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Colossal dielectric and magnetodielectric effect inEr2O3nanoparticles embedded in aSiO2

Cited by 29 publications

References 40 publications

RE2O3 Nanoparticles Embedded in SiO2 Glass Matrix — A Colossal Dielectric and Magnetodielectric Response

RE2O3 Nanoparticles Embedded in SiO2 Glass Matrix — A Colossal Dielectric and Magnetodielectric Response

Dielectric phenomena of multiferroic oxides at acoustic- and radio-frequency

Recent advances in sol–gel synthesis of monolithic silica and silica-based glasses

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