In-situ synthesis of Sc2W3O12/YSZ ceramic composites with controllable thermal expansion

Liu, Qinqin; Fan, Chunya; Wu, Guozhong; Zhao, Yuhong; Sun, Xiujuan; Cheng, Xiaonong; Shen, Jiangtao; Hu, Yangming

doi:10.1016/j.ceramint.2015.03.021

Cited by 16 publications

(4 citation statements)

References 22 publications

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“…In an early short report, it was shown (Forster et al, 1998) (Liu Q. et al, 2015). The same tendency was observed for a series of tungstates including the trivalent cations of Lu, Yb, Er and Y, where negative linear CTEs increased from Lu 2 W 3 O 12 to Y 2 W 3 O 12 , following the increase of cationic radius from Lu to Y in the A crystallographic site.…”

Section: Mechanisms Controlling Ctesupporting

confidence: 55%

Negative and Near-Zero Thermal Expansion in A2M3O12 and Related Ceramic Families: A Review

et al. 2021

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This review presents the history of materials in the A2M3O12 and related ceramic families, including their unusual thermal expansion and the present understanding of its mechanism, and related factors such as hydroscopicity and the monoclinic to orthorhombic phase transition. Other properties, including thermomechanical, thermal and ionic conduction and optical properties, are presented in terms of current knowledge, challenges and opportunities for applications. One of the largest challenges is the production of monoliths, and various methods for consolidation and sintering are summarized. These ceramics have considerable promise when combined with other materials, and recent advances in such composites are presented. These matters are placed in the context of the potential applications of negative and near-zero thermal expansion ceramics, which still present challenges for future materials researchers.

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Section: Mechanisms Controlling Ctesupporting

confidence: 55%

Negative and Near-Zero Thermal Expansion in A2M3O12 and Related Ceramic Families: A Review

et al. 2021

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“…Second, they have rather high values of elastic moduli and strength, which allow using them in highly loaded friction units. These ceramic materials also have close values of specific heat capacity and thermal conductivity, which make them especially promising as components of Sc2W3O12/YSZ composites intended for various high-temperature applications [52]. Finally, the CTE values of these ceramics are close in absolute value but have the opposite sign (Sc2W3O12 is NTE material, while ZrO2 is a traditional PTE material).…”

Section: Methodsmentioning

confidence: 95%

Modeling Wear and Friction Regimes on Ceramic Materials with Positive and Negative Thermal Expansion

Grigoriev,

Shilko,

Dmitriev

et al. 2023

Lubricants

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Computer modeling of rubbing between two surfaces with microasperities capable of expanding or contracting under conditions of frictional heating (i.e., possessing either positive and negative coefficient of thermal expansion (CTE)) allowed for the identification of wear-and-friction regimes on model ceramic materials. Assuming that no adhesion was involved in the interaction between asperities, two wear regimes—i.e., wear-free and continuous wear—have been revealed in both materials as dependent on the applied normal stress level and sliding velocity. The effect of the normal load on wear rate was similar for both positive and negative thermal expansion ceramics. Sliding velocity has a qualitatively different effect on the wear of materials with either positive or negative thermal expansion. The results indicated that the feasibility of reconstructing wear maps was common for both positive and negative CTE ceramics in terms of dimensionless mechanical and thermophysical characteristics.

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“…A number of studies have shown that AW 2 O 8 is metastable at high temperature, while AV 2 O 7 undergoes a structure phase transition at about 427 K. Materials with general formula of A 2 M 3 O 12 (A = +3 ions; M = Mo, W) also exhibit NTE properties in a wide temperature range but NTE is anisotropic. Except for Sc 2 W 3 O 12 , [4,5] all the members of A 2 M 3 O 12 family show either structure phase transition (e.g., Fe 2 Mo 3 O 12 , Cr 2 Mo 3 O 12 , Al 2 Mo 3 O 12 , [6] Al 2 W 3 O 12 and In 2 W 3 O 12 ) [7] or hydroscopicity (e.g., Yb 2 Mo 3 O 12 , [8] Y 2 Mo 3 O 12 [9] and Y 2 W 3 O 12 ). [10] A great deal of research has been carried out to control the phase transition or hydroscopicity of A 2 M 3 O 12 by substituting A 4+ or M 6+ with other ions.…”

Section: Introductionmentioning

confidence: 99%

Effects of W⁶⁺ occupying Sc³⁺ on the structure, vibration, and thermal expansion properties of scandium tungstate*

Chen

Sun

et al. 2021

Chinese Phys. B

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We experimentally investigate effects of W6+ occupying the sites of Sc3+ in the unit cell of Sc2W3O12 (Sc8W12O48) on the structure, vibration and thermal expansion. The composition and structure of the doped sample (Sc6W2)W12O48 ± δ (with two W6+ occupying two sites of Sc3+ in the unit cell of Sc8W12O48) are analyzed and identified by combining the x-ray photoelectron spectroscopy and the synchronous x-ray diffraction with first-principles calculations based on density functional theory. Results show that the crystal with even W6+ occupying even Sc3+ in the unit cell is stable and maintains the orthorhombic structure at room temperature. The structure of the doped sample is similar to that of Sc2W3O12, and with even W occupying even positions of Sc in the unit cell and constituting the WO6 octahedra. Raman analyses show that the doped sample possesses stronger W–O bonds and wider Raman linewidths than those of Sc2W3O12. The sample doped with W also exhibits intrinsic negative thermal expansion in the measured range of 150 K–650 K.

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In-situ synthesis of Sc2W3O12/YSZ ceramic composites with controllable thermal expansion

Cited by 16 publications

References 22 publications

Negative and Near-Zero Thermal Expansion in A2M3O12 and Related Ceramic Families: A Review

Negative and Near-Zero Thermal Expansion in A2M3O12 and Related Ceramic Families: A Review

Modeling Wear and Friction Regimes on Ceramic Materials with Positive and Negative Thermal Expansion

Effects of W⁶⁺ occupying Sc³⁺ on the structure, vibration, and thermal expansion properties of scandium tungstate*

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In-situ synthesis of Sc2W3O12/YSZ ceramic composites with controllable thermal expansion

Cited by 16 publications

References 22 publications

Negative and Near-Zero Thermal Expansion in A2M3O12 and Related Ceramic Families: A Review

Negative and Near-Zero Thermal Expansion in A2M3O12 and Related Ceramic Families: A Review

Modeling Wear and Friction Regimes on Ceramic Materials with Positive and Negative Thermal Expansion

Effects of W6+ occupying Sc3+ on the structure, vibration, and thermal expansion properties of scandium tungstate*

Contact Info

Product

Resources

About

Effects of W⁶⁺ occupying Sc³⁺ on the structure, vibration, and thermal expansion properties of scandium tungstate*