Structural Characterization and Dielectric studies of Gd doped ZrO2 nano crystals Synthesized by Solution combustion method

Madhusudhana, H.C.; Shobhadevi, S.N.; Nagabhushana, B.M.; Krishna, R. Hari; Murugendrappa, M. V.; Nagabhushana, H.

doi:10.1016/j.matpr.2018.06.519

Cited by 10 publications

(14 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…AC impedance spectroscopy results of the as synthesized Gd doped ZrO 2 show good dielectric properties with a very high dielectric constant (ε = 345) and as well a high AC conductivity (σ ac = 0.06837 S•cm −1 ) at 10 MHz for 7 mol% of Gd doped ZrO 2 . This material is best suitable for solid oxide fuel cell applications [23].…”

Section: Synthesis and Properties Of Zro 2 Ceramic Powders Doped With Mixed Reosmentioning

confidence: 99%

Design, Fabrication, and Characterization of New Materials Based on Zirconia Doped with Mixed Rare Earth Oxides: Review and First Experimental Results

Motoc

Valsan

Slobozeanu

et al. 2020

Metals

View full text Add to dashboard Cite

Monazite is one of the most valuable natural resources for rare earth oxides (REOs) used as dopants with high added value in ceramic materials for extreme environments applications. The complexity of the separation process in individual REOs, due to their similar electronic configuration and physical–chemical properties, is reflected in products with high price and high environmental footprint. During last years, there was an increasing interest for using different mixtures of REOs as dopants for high temperature ceramics, in particular for ZrO2-based thermal barrier coatings (TBCs) used in aeronautics and energy co-generation. The use of mixed REOs may increase the working temperature of the TBCs due to the formation of tetragonal and cubic solid solutions with higher melting temperatures, avoiding grain size coarsening due to interface segregation, enhancing its ionic conductivity and sinterability. The thermal stability of the coatings may be further improved by using rare earth zirconates with perovskite or pyrochlore structures having no phase transitions before melting. Within this research framework, firstly we present a review analysis about results reported in the literature so far about the use of ZrO2 ceramics doped with mixed REOs for high temperature applications. Then, preliminary results about TBCs fabricated by electron beam evaporation starting from mixed REOs simulating the real composition as occurring in monazite source minerals are reported. This novel recipe for ZrO2-based TBCs, if optimized, may lead to better materials with lower costs and lower environmental impact, as a result of the elimination of REOs extraction and separation in individual lanthanides. Preliminary results on the compositional, microstructure, morphological, and thermal properties of the tested materials are reported.

show abstract

Section: Synthesis and Properties Of Zro 2 Ceramic Powders Doped With Mixed Reosmentioning

confidence: 99%

Design, Fabrication, and Characterization of New Materials Based on Zirconia Doped with Mixed Rare Earth Oxides: Review and First Experimental Results

Motoc

Valsan

Slobozeanu

et al. 2020

Metals

View full text Add to dashboard Cite

show abstract

“…That is why more attention is given on the fabrication of thin electrolytes supported SOFCs relying on yttria-stabilized zirconia (YSZ) that has been widely used as an electrolyte material at high temperatures rather than the ceria-based electrolyte. [35][36][37][38][39][40] In ZrO 2 -based materials, combination of high dielectric permittivity and thermal stability with low leakage current due to a reasonably high barrier height that limits electron tunnelling, counts it to further research as oxide ion conductor for SOFCs application. [36][37][38] Also, Bi-based based oxide ion conductors demonstrate the remarkable ionic conductivity due to highconcentration of intrinsic oxygen vacancies and high polarizability of Bi 3+ with 6s 2 lone pair electrons.…”

Section: Introductionmentioning

confidence: 99%

Gd³⁺ and Bi³⁺ co-substituted cubic zirconia; (Zr_1−x−yGd_xBi_yO_2−δ): a novel high κ relaxor dielectric and superior oxide-ion conductor

2022

View full text Add to dashboard Cite

show abstract

“…Zirconium dioxide (ZrO 2 ), also known as zirconia and zirconium oxide, is a ceramic material of great technological importance due to its advanced multidimensional properties, such as: high mechanical strength, chemical inertness, high temperature stability, low thermal conductivity, corrosion resistance, high ionic conductivity and biocompatibility [ 1 , 2 ]. These properties lead to different applications in areas such as gas sensors [ 3 ], solid-oxide fuel-cell [ 4 ], catalysis [ 5 ], thermal barrier coating [ 6 ], medical prosthesis [ 7 ] and memory devices [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

“…Solution combustion method using Glycine as a fuel, was used by H. C. Madhusudhana et al to synthesize Gd doped ZrO 2 (1–9 mol%). In the case of the 7% mol sample of Gd doped ZrO 2 , the results of the impedance spectroscopy show good dielectric properties with a very high dielectric constant (ε′ = 345) and also a high alternative conductivity (σ ac = 0.06837 S·cm −1 ) at 10 MHz, suitable for solid oxide fuel cell applications [ 1 ].…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Synthesis of Nanocrystalline ZrO2-8Y2O3-xLn2O3 Powders (Ln = La, Gd, Nd, Sm): Crystalline Structure, Thermal and Dielectric Properties

et al. 2021

View full text Add to dashboard Cite

Zirconium dioxide (ZrO2) is one of the ceramic materials with high potential in many areas of modern technologies. ZrO2 doped with 8 wt.% (~4.5 mol%) Y2O3 is a commercial powder used for obtaining stabilized zirconia materials (8 wt.% YSZ) with high temperature resistance and good ionic conductivity. During recent years it was reported the co-doping with multiple rare earth elements has a significant influence on the thermal, mechanical and ionic conductivity of zirconia, due complex grain size segregation and enhanced oxygen vacancies mobility. Different methods have been proposed to synthesize these materials. Here, we present the hydrothermal synthesis of 8 wt.% (~4.5 mol%) YSZ co-doped with 4, 6 and 8 wt.% La2O3, Nd2O3, Sm2O3 and Gd2O3 respectively. The crystalline phases formed during their thermal treatment in a large temperature range were analyzed by X-ray diffraction. The evolution of phase composition vs. thermal treatment temperatures shows as a major trend the formation at temperatures >1000 °C of a cubic solid solutions enriched in the rare earth oxide used for co-doping as major phase. The first results on the thermal conductivities and impedance measurements on sintered pellets obtained from powders co-doped with 8 wt.% Y and 6% Ln (Ln = La, Nd, Sm and Gd) and the corresponding activation energies are presented and discussed. The lowest thermal conductivity was obtained for La co-doped 8 wt.% YSZ while the lowest activation energy for ionic conduction for Gd co-doped 8 wt.% YSZ materials.

show abstract

Structural Characterization and Dielectric studies of Gd doped ZrO2 nano crystals Synthesized by Solution combustion method

Cited by 10 publications

References 18 publications

Design, Fabrication, and Characterization of New Materials Based on Zirconia Doped with Mixed Rare Earth Oxides: Review and First Experimental Results

Design, Fabrication, and Characterization of New Materials Based on Zirconia Doped with Mixed Rare Earth Oxides: Review and First Experimental Results

Gd³⁺ and Bi³⁺ co-substituted cubic zirconia; (Zr_1−x−yGd_xBi_yO_2−δ): a novel high κ relaxor dielectric and superior oxide-ion conductor

Hydrothermal Synthesis of Nanocrystalline ZrO2-8Y2O3-xLn2O3 Powders (Ln = La, Gd, Nd, Sm): Crystalline Structure, Thermal and Dielectric Properties

Contact Info

Product

Resources

About

Structural Characterization and Dielectric studies of Gd doped ZrO2 nano crystals Synthesized by Solution combustion method

Cited by 10 publications

References 18 publications

Design, Fabrication, and Characterization of New Materials Based on Zirconia Doped with Mixed Rare Earth Oxides: Review and First Experimental Results

Design, Fabrication, and Characterization of New Materials Based on Zirconia Doped with Mixed Rare Earth Oxides: Review and First Experimental Results

Gd3+ and Bi3+ co-substituted cubic zirconia; (Zr1−x−yGdxBiyO2−δ): a novel high κ relaxor dielectric and superior oxide-ion conductor

Hydrothermal Synthesis of Nanocrystalline ZrO2-8Y2O3-xLn2O3 Powders (Ln = La, Gd, Nd, Sm): Crystalline Structure, Thermal and Dielectric Properties

Contact Info

Product

Resources

About

Gd³⁺ and Bi³⁺ co-substituted cubic zirconia; (Zr_1−x−yGd_xBi_yO_2−δ): a novel high κ relaxor dielectric and superior oxide-ion conductor