Order–Disorder Transition and Unconventional Thermal Conductivities of the (Sm1−xYbx)2Zr2O7 Series

Wan, Chunlei; Zhi, Qu; Du, Aibing; Pan, Wei

doi:10.1111/j.1551-2916.2010.04113.x

Cited by 112 publications

(48 citation statements)

References 30 publications

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“…[20,25] Although the thermal conductivity dependence on the size of the B-site (i.e., Zr in Ln 2 Zr 2 O 7 ) is stronger, the size of the A-site also has an effect, and simulations predict the lowest thermal conductivities for samarium, europium, and gadolinium on the A-site. [57] [16,18,55,56,[58][59][60][61] and 8, [16,56,[61][62][63][64][65][66][67] [67] are similarly in the lower range of the YSZ materials, as shown in Figure 9. Gd 2 Zr 2 O 7 and Sm 2 Zr 2 O 7 have received the most attention as candidate thermal barrier coating materials due to their good combination of thermal and mechanical properties.…”

Section: Thermal Conductivitymentioning

confidence: 99%

“…9-Thermal conductivity of Ln 2 Zr 2 O 7 (Ln = Nd, Dy, Er, Eu, Y, Yb). [16,52,53,56,58,[66][67][68][69] doping of La 2 Zr 2 O 7 and ytterbium doping of Gd 2 Zr 2 O 7 , are shown in Figure 10. [53,60] Because of the structural similarities among the lanthanide zirconates, solid solutions between lanthanide zirconates can be formed and provide lower thermal conductivities.…”

Section: Thermal Conductivitymentioning

confidence: 99%

“…[53,60] Because of the structural similarities among the lanthanide zirconates, solid solutions between lanthanide zirconates can be formed and provide lower thermal conductivities. The thermal conductivities of two of these solutions, (La 1Àx Gd x ) 2 Zr 2 O 7 [55] and (Sm 1Àx Yb x ) 2 Zr 2 O 7 , [66] are shown in Figure 11. In both cases, the minimum thermal conductivities are in the middle composition range.…”

Section: Thermal Conductivitymentioning

confidence: 99%

“…The minimum thermal conductivity for (Sm 1Àx Yb x ) 2 Zr 2 O 7 is at about x~1/3 and was attributed to lattice softening associated with disordering of the structure. [66] Dopants can also occupy the zirconium site in lanthanide zirconates. For example, La 2 Zr 2 O 7 has been Fig.…”

Section: Thermal Conductivitymentioning

confidence: 99%

“…Similarly, the thermal conductivity of Gd 2 Zr 2 O 7 has been reduced with additions of yttrium, [70] ytterbium, [60] and neodymium. [71] Two examples of the beneficial effect of doping, yttrium [ 16,56,[61][62][63][64][65][66][67] Fig. 9-Thermal conductivity of Ln 2 Zr 2 O 7 (Ln = Nd, Dy, Er, Eu, Y, Yb).…”

Section: Thermal Conductivitymentioning

confidence: 99%

See 4 more Smart Citations

Zirconia and Pyrochlore Oxides for Thermal Barrier Coatings in Gas Turbine Engines

Fergus

2014

Metallurgical and Materials Transactions E

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One of the important applications of yttria-stabilized zirconia (YSZ) is as a thermal barrier coating for gas turbine engines. While YSZ performs well in this function, the need for increased operating temperatures to achieve higher energy conversion efficiencies, requires the development of improved materials. To meet this challenge, some rare-earth zirconates that form the cubic fluorite-derived pyrochlore structure are being developed for use in thermal barrier coatings due to their low thermal conductivity, excellent chemical stability, and other suitable properties. In this paper, the thermal conductivities of current and prospective oxides for use in thermal barrier coatings are reviewed. The factors affecting the variations and differences in the thermal conductivities and the degradation behaviors of these materials are discussed.

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Section: Thermal Conductivitymentioning

confidence: 99%

Section: Thermal Conductivitymentioning

confidence: 99%

Section: Thermal Conductivitymentioning

confidence: 99%

Section: Thermal Conductivitymentioning

confidence: 99%

Section: Thermal Conductivitymentioning

confidence: 99%

See 3 more Smart Citations

Zirconia and Pyrochlore Oxides for Thermal Barrier Coatings in Gas Turbine Engines

Fergus

2014

Metallurgical and Materials Transactions E

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Advanced Materials for High‐Temperature Thermal Transport

Shin

Wang

Luo

et al. 2019

Adv Funct Materials

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High temperature processes are widely used in a variety of existing and emerging industrial and aerospace applications. The thermal properties of high‐temperature materials thus play an important role in controlling the thermal energy, as highlighted by successful applications of thermal barrier coating and aerogels. While thermal transport processes at room and low temperature have witnessed tremendous progress in the past two decades, particularly on the fronts of understanding basic heat transfer properties at the micro‐ and nanoscale, the understanding at high temperature is still at the nascent stage, owing to several unique features at high temperature, such as the dominant Umklapp scattering effect that can render a crystalline material amorphous‐like thermal properties, and the important radiation contribution at high temperature. This lack of systematic understanding, coupled with the challenges in maintaining high‐temperature stability in a large number of materials, has limited the development of materials to meet the thermal transport properties pertaining to several current and emerging high‐temperature applications. This Review is aimed at providing an overview of the basic mechanisms governing thermal transport processes at high temperature, to identify their unique features and challenges, and to explore opportunities in material research for high‐temperature thermal materials.

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Diffused Lattice Vibration and Ultralow Thermal Conductivity in the Binary Ln–Nb–O Oxide System

et al. 2019

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In the pursuit of low thermal conductivity materials for thermal management, one always tries to increase the material entropy by increasing the number of components in the materials to scatter heat‐carrying phonons. However, it also drastically increases the technological complexity to synthesize materials with the target complex composition. Here, a material family is presented with simple composition Ln3NbO7, which only contains binary oxides of Ln2O3 (Ln = Dy, Er, Y, Yb) and Nb2O5. The thermal conductivities approach the theoretical minimum limit, where the large chemical inhomogeneity due to the charge disorder and fluctuation of bonding length in Ln3NbO7 plays a major role. Despite the simple composition, Ln3NbO7 demonstrates an unprecedentedly high scattering rate of vibration states, as confirmed by the highest elastic constant/thermal conductivity ratio, as well as the diffused wavevector‐frequency dispersion. In contrast to the conventional wisdom that low thermal conductivity materials should be explored in the pool of “complex” multiple‐component materials, this work points out an avenue to look into materials with simple composition but large internal chemical inhomogeneity, which would be of both scientific and technological significance in the fields of thermal barrier coating, thermoelectric materials, etc.

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Order–Disorder Transition and Unconventional Thermal Conductivities of the (Sm_1−xYb_x)₂Zr₂O₇ Series

Cited by 112 publications

References 30 publications

Zirconia and Pyrochlore Oxides for Thermal Barrier Coatings in Gas Turbine Engines

Zirconia and Pyrochlore Oxides for Thermal Barrier Coatings in Gas Turbine Engines

Advanced Materials for High‐Temperature Thermal Transport

Diffused Lattice Vibration and Ultralow Thermal Conductivity in the Binary Ln–Nb–O Oxide System

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