4.7 Article

Phase stabilized solution combustion processed (Ce0.2La0.2Pr0.2Sm0.2Y0.2) O1.6-δ: An exploration of the dielectric properties

Related references

Note: Only part of the references are listed.
Article Materials Science, Ceramics

Evolution behaviour of the lattice and thermal expansion of a high-entropy fluorite oxide (Zr0.2Ce0.2Hf0.2Y0.2Al0.2)O2-8 during heating and cooling in an inert atmosphere

Yubin Wen et al.

Summary: High-entropy fluorite oxides (HEFOs) are promising thermal barrier coatings (TBCs) with improved performance. The thermal expansion coefficient (TEC) plays a crucial role in the direct contact between TBCs and metal substrates. This study investigates the evolutionary behavior of lattice and thermal expansion of a specific HEFO (Zr0.2Ce0.2Hf0.2Y0.2Al0.2)O2-8 during heating and cooling in an inert atmosphere.

CERAMICS INTERNATIONAL (2023)

Article Materials Science, Ceramics

Compositional design of single-phase rare-earth based high-entropy oxides (HEOs) by using the cluster-plus-glue atom model

Luca Spiridigliozzi et al.

Summary: In this study, we used the cluster-plus-glue atom model to investigate the formation of fluorite-structured High-Entropy Oxides (HEOs), especially based on equimolar mixtures of Rare-Earth Oxides. We were able to confirm the effectiveness of our previously proposed empirical predictor, and also explained the role of Cerium and Zirconium in the formation of these HEOs. Additionally, we designed a novel non-equimolar system and successfully stabilized a bixbyite-like single phase.

CERAMICS INTERNATIONAL (2023)

Article Chemistry, Physical

On the Effect of Standard Deviation of Cationic Radii on the Transition Temperature in Fluorite-Structured Entropy-Stabilized Oxides (F-ESO)

Luca Spiridigliozzi et al.

Summary: Fluorite-structured Entropy-Stabilized Oxides (F-ESO) can be obtained using a multicomponent equimolar system based on cerium, zirconium, and other rare earth elements. The phase transition from multiple phases to a single-phase fluorite structure was confirmed through calcination at 1500 degrees C for 1 hour. High temperature X-ray diffraction analysis revealed an inverse correlation between the standard deviation and the entropy-driven transition temperature, indicating that higher standard deviation leads to lower transition temperature. These findings support the empirical predictor developed by the authors and suggest that high standard deviation contributes to the overall entropy of the system.

MATERIALS (2023)

Article Engineering, Electrical & Electronic

Evolution of High Dielectric Permittivity in Low-Temperature Solution Combustion-Processed Phase-Pure High Entropy Oxide (CoMnNiFeCr)O for Thin Film Transistors

Ashritha Salian et al.

Summary: This study investigates the dielectric permittivity of sintered high entropy oxide (HEO) capacitors composed of Co, Cr, Fe, Mn, and Ni. The stabilization of the phase in HEO is crucial for their properties. The optimized parameters are applied to deposit (CoCrFeMnNi)O dielectric thin films and thin film transistors, which exhibit high permittivity and low leakage current density.

ACS APPLIED ELECTRONIC MATERIALS (2023)

Review Materials Science, Multidisciplinary

Entropy stabilized multicomponent oxides with diverse functionality - a review

Ashritha Salian et al.

Summary: High-entropy oxides (HEOs) have captured significant scientific attention for their exceptional and tunable properties, with the main driving force being the control of configurational entropy to achieve phase purity. These new oxide candidates show great potential for practical applications and represent a key frontier for researchers to explore.

CRITICAL REVIEWS IN SOLID STATE AND MATERIALS SCIENCES (2022)

Article Chemistry, Physical

Infrared spectra of surface nitrates: Revision of the current opinions based on the case study of ceria

M. Y. Mihaylov et al.

Summary: The structures of nitrates formed on ceria surface were investigated using FTIR spectroscopy and DFT methods, with isotope labelling utilized to strengthen the conclusions. It was found that monodentate nitrates were actually tridentate nitrates with C-2v symmetry, and bidentate nitrates typically bridge and chelate cerium cations. The spectral differences between these species are due to binding geometry and symmetry reduction.

JOURNAL OF CATALYSIS (2021)

Article Materials Science, Multidisciplinary

A simple and effective predictor to design novel fluorite-structured High Entropy Oxides (HEOs)

Luca Spiridigliozzi et al.

Summary: High-Entropy Oxides (HEOs) are a new class of ceramic materials that have attracted scientific attention due to their complexity and potential for design using entropy as a driving force. By studying Rare Earths-based oxides, researchers have found that the dispersion of cationic radii of elements in a system is critical for stabilizing single-phase HEOs in a fluorite-like structure.

ACTA MATERIALIA (2021)

Article Materials Science, Ceramics

High-entropy oxides based on valence combinations: design and practice

Lei Tang et al.

Summary: High-entropy oxides (HEOs) are a new class of materials with wide applications, and designing them requires consideration of geometric compatibility and electrical balance. Researchers have proposed a two-step strategy to systematically select constituent materials for making HEOs, successfully synthesizing single-phase cubic perovskites in multiple subsystems. This strategy is expected to be applicable to other oxide systems as well.

JOURNAL OF THE AMERICAN CERAMIC SOCIETY (2021)

Article Materials Science, Ceramics

Preparation and phase evolution of high-entropy oxides A2B2O7 with multiple elements at A and B sites

Zhen Teng et al.

Summary: This study successfully synthesized 37 kinds of high-entropy pyrochlore/fluorite ceramics, with 33 of them showing a single-phase structure where all cations are randomly distributed. Ionic radii, valence, and size disorder play a key role in the formation of single-phase high-entropy pyrochlore/fluorite oxides. The average radius ratio(rA/rB) is the main factor influencing the phase transformation of pyrochlore/fluorite.

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY (2021)

Article Nanoscience & Nanotechnology

A High Entropy Oxide Designed to Catalyze CO Oxidation Without Precious Metals

Christopher Riley et al.

Summary: This study demonstrates the application of high entropy oxides (HEOs) in designing efficient oxidation catalysts with enhanced catalytic activity, oxygen storage capacity, and thermal stability. Through a simple sol-gel method, nanostructured HEOs with high surface areas up to 138m(2)/g were synthesized, marking a significant structural improvement.

ACS APPLIED MATERIALS & INTERFACES (2021)

Article Materials Science, Ceramics

A new class of high-entropy fluorite oxides with tunable expansion coefficients, low thermal conductivity and exceptional sintering resistance

Liang Xu et al.

Summary: The high-entropy fluorite-type oxides (HEFOs) synthesized in this study possess unique thermal expansion coefficients and low thermal conductivities, making them suitable candidates for high-temperature thermal barrier coatings and insulating materials.

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY (2021)

Article Materials Science, Ceramics

Evolution of structure and improvement in dielectric properties of praseodymium substituted YFeO3 nanomaterials synthesized via a sol-gel auto-combustion method

Muhammad Asif et al.

Summary: In this study, Y1-xPrxFeO3(0 <= x <= 0.16) ceramics were synthesized using the auto-combustion sol-gel method, and structural and morphological analysis was conducted using XRD, SEM with EDS mapping, and FTIR. The substitution of Pr transformed the orthorhombic structure into a hexagonal one and significantly enhanced the dielectric constant, making it potentially suitable for high-frequency applications.

CERAMICS INTERNATIONAL (2021)

Review Chemistry, Multidisciplinary

Electroceramics for High-Energy Density Capacitors: Current Status and Future Perspectives

Ge Wang et al.

Summary: The importance of dielectric capacitors in high energy storage, specifically focusing on the development of traditional lead-free capacitors and dielectric ceramics for high-temperature applications. The paper discusses key factors to improve energy storage properties and emphasizes the need for new materials in high power/energy density capacitor applications in the future.

CHEMICAL REVIEWS (2021)

Article Chemistry, Multidisciplinary

Kinetics of Thermal Decomposition of Yttrium and Samarium Hydroxides and Sm(OH)3@Y(OH)3 Compound with a Core-Shell Nanostructure

A. Sotnikov et al.

Summary: The decomposition mechanisms of hydrated hydroxides of rare-earth metals Sm(OH)(3)·(H2O)(gel)·nH(2)O and Y(OH)(3)·(H2O)(gel)·nH(2)O, as well as compound [Sm(OH)(3)·(H2O)(gel)·nH(2)O](q)@[Y(OH)(3)·(H2O)(gel)·nH(2)O](p) with a core-shell nanostructure, were studied. It was observed that there were stages of successive phase transformations during the thermal treatment of hydroxides in the range of 25-900 degrees C. The kinetics of successive dehydration and dehydroxylation of the compounds were analyzed, showing that the activation energy for polycondensation of the compound with a core-shell nanostructure is lower than that of individual hydrates of samarium and yttrium hydroxides.

RUSSIAN JOURNAL OF GENERAL CHEMISTRY (2021)

Article Multidisciplinary Sciences

Enhanced sunlight photocatalytic activity and biosafety of marine-driven synthesized cerium oxide nanoparticles

Somayeh Safat et al.

Summary: This study investigated the synthesis and properties of biogenic CeO2 nanoparticles using marine oyster extract. The nanoparticles showed good biocompatibility and enhanced photocatalytic performance for pollutant degradation. The simple and environmentally friendly biosynthetic route opens up potential applications of nanoparticles in various fields.

SCIENTIFIC REPORTS (2021)

Article Chemistry, Physical

Entropy-Stabilized Oxides owning Fluorite Structure obtained by Hydrothermal Treatment

Luca Spiridigliozzi et al.

MATERIALS (2020)

Article Materials Science, Multidisciplinary

Structural, electric and dielectric properties of Ni0.5Zn0.5FeCoO4 ferrite prepared by sol-gel

Aref Omri et al.

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS (2020)

Article Engineering, Electrical & Electronic

Phase evolution and dielectric properties of Ba(Ti1/6Sn1/6Zr1/6Hf1/6Nb1/6Ga1/6)O3 high-entropy perovskite ceramics

Qiang Du et al.

JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS (2020)

Article Materials Science, Ceramics

Synthesis and structures of high-entropy pyrochlore oxides

Zhen Teng et al.

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY (2020)

Article Nanoscience & Nanotechnology

Role of intermediate 4f states in tuning the band structure of high entropy oxides

Abhishek Sarkar et al.

APL MATERIALS (2020)

Article Materials Science, Ceramics

High entropy defective fluorite structured rare-earth niobates and tantalates for thermal barrier applications

Zifan Zhao et al.

JOURNAL OF ADVANCED CERAMICS (2020)

Article Chemistry, Physical

High entropy spinel oxide nanoparticles for superior lithiation-delithiation performance

Thi Xuyen Nguyen et al.

JOURNAL OF MATERIALS CHEMISTRY A (2020)

Article Engineering, Electrical & Electronic

Tunable dielectric properties of porous ZnAl2O4 ceramics for wave-transmitting devices

Qiuyu Wang et al.

JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS (2019)

Article Nanoscience & Nanotechnology

On the homogeneity of high entropy oxides: An investigation at the atomic scale

Mohammed Reda Chellali et al.

SCRIPTA MATERIALIA (2019)

Article Chemistry, Multidisciplinary

Pressure-induced tuning of lattice distortion in a high-entropy oxide

Benyuan Cheng et al.

COMMUNICATIONS CHEMISTRY (2019)

Article Chemistry, Physical

Solution combustion synthesis of nano-catalysts with a hierarchical structure

G. Xanthopoulou et al.

JOURNAL OF CATALYSIS (2018)

Article Materials Science, Ceramics

High-entropy fluorite oxides

Joshua Gild et al.

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY (2018)

Article Materials Science, Ceramics

A five-component entropy-stabilized fluorite oxide

Kepi Chen et al.

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY (2018)

Article Thermodynamics

Thermal decomposition of praseodymium nitrate hexahydrate Pr(NO3)3•6H2O

P. Melnikov et al.

JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY (2018)

Article Materials Science, Multidisciplinary

Synthesis and characterization of binary (CuO)0.6(CeO2)0.4 nanoparticles via a simple heat treatment method

Anwar Ali Baqer et al.

RESULTS IN PHYSICS (2018)

Proceedings Paper Physics, Condensed Matter

One-step Synthesis and Characterizations of Cerium oxide Nanoparticles in an Ambient Temperature via Co-Precipitation Method

Malatesh S. Pujar et al.

62ND DAE SOLID STATE PHYSICS SYMPOSIUM (2018)

Article Chemistry, Multidisciplinary

Size- and defect-controlled anti-oxidant enzyme mimetic and radical scavenging properties of cerium oxide nanoparticles

G. Vinothkumar et al.

NEW JOURNAL OF CHEMISTRY (2018)

Article Materials Science, Multidisciplinary

Multicomponent equiatomic rare earth oxides

Ruzica Djenadic et al.

MATERIALS RESEARCH LETTERS (2017)

Review Chemistry, Physical

Applications and limitations of two step metal oxide thermochemical redox cycles; a review

B. Bulfin et al.

JOURNAL OF MATERIALS CHEMISTRY A (2017)

Article Chemistry, Inorganic & Nuclear

Multicomponent equiatomic rare earth oxides with a narrow band gap and associated praseodymium multivalency

Abhishek Sarkar et al.

DALTON TRANSACTIONS (2017)

Article Physics, Applied

A divalent rare earth oxide semiconductor: Yttrium monoxide

Kenichi Kaminaga et al.

APPLIED PHYSICS LETTERS (2016)

Article Materials Science, Multidisciplinary

The effects of ceria morphology on the properties of Pd/ceria catalyst for catalytic oxidation of low-concentration methane

Tianyu Guo et al.

JOURNAL OF MATERIALS SCIENCE (2016)

Article Materials Science, Multidisciplinary

Colossal dielectric constant in high entropy oxides

David Berardan et al.

PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS (2016)

Article Chemistry, Physical

Room temperature lithium superionic conductivity in high entropy oxides

D. Berardan et al.

JOURNAL OF MATERIALS CHEMISTRY A (2016)

Article Chemistry, Inorganic & Nuclear

Synthesis, Structural Features, Cytotoxicity, and Magnetic Properties of Colloidal Ferrite Spinel Co1-xNixFe2O4 (0.1≤x≤0.9) Nanoparticles

Robert Pazik et al.

EUROPEAN JOURNAL OF INORGANIC CHEMISTRY (2015)

Article Multidisciplinary Sciences

Entropy-stabilized oxides

Christina M. Rost et al.

NATURE COMMUNICATIONS (2015)

Article Chemistry, Physical

Applications of yttria stabilized zirconia (YSZ) in catalysis

M. N. Tsampas et al.

CATALYSIS SCIENCE & TECHNOLOGY (2015)

Article Materials Science, Ceramics

Synthesis, structural and dielectric properties of Cr3+ substituted Fe3O4 nano-particles

Naveen Kumari et al.

CERAMICS INTERNATIONAL (2014)

Article Thermodynamics

Thermolysis mechanism of samarium nitrate hexahydrate

P. Melnikov et al.

JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY (2014)

Article Thermodynamics

Mechanism of thermal decomposition of yttrium nitrate hexahydrate, Y(NO3)3•6H2O and modeling of intermediate oxynitrates

P. Melnikov et al.

JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY (2013)

Article Chemistry, Multidisciplinary

UV and Visible Raman Studies of Oxygen Vacancies in Rare-Earth-Doped Ceria

Ming Guo et al.

LANGMUIR (2011)

Article Multidisciplinary Sciences

A dielectric polymer with high electric energy density and fast discharge speed

Baojin Chu et al.

SCIENCE (2006)

Article Materials Science, Multidisciplinary

Complex impedance studies on tungsten-bronze electroceramic: Pb2Bi3LaTi5O18

CK Suman et al.

JOURNAL OF MATERIALS SCIENCE (2006)

Article Materials Science, Multidisciplinary

Thermal barrier coating materials

David R. Clarke et al.

MATERIALS TODAY (2005)

Review Materials Science, Multidisciplinary

Combustion synthesis: an update

KC Patil et al.

CURRENT OPINION IN SOLID STATE & MATERIALS SCIENCE (2002)

Article Chemistry, Physical

Thermal genesis course and characterization of lanthanum oxide

GAH Mekhemer et al.

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS (2001)