Thermal expansion properties of Lu2−xFexMo3O12

Mei-Mei, Wu; Peng, J.; Zu, Yong; Liu, Rong-Deng; Zhong-bo, HU; Liu, Yuntao; Chen, Dongfeng

doi:10.1088/1674-1056/21/11/116102

Cited by 21 publications

(7 citation statements)

References 24 publications

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“…Larger cations are also associated with more negative expansion coefficients [52]. In a number of systems, mixing of two trivalent A-site cations results in intermediate expansion coefficients that approximately follow the rule of mixtures and allows the preparation of solid solutions with close to zero thermal expansion [53,54,55,56,57]. However, mixed A-site cations can also result in more complex behavior.…”

Section: Introductionmentioning

confidence: 99%

Low Temperature Synthesis and Characterization of AlScMo3O12

et al. 2015

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Recent interest in low and negative thermal expansion materials has led to significant research on compounds that exhibit this property, much of which has targeted the A2M3O12 family (A = trivalent cation, M = Mo, W). The expansion and phase transition behavior in this family can be tuned through the choice of the metals incorporated into the structure. An undesired phase transition to a monoclinic structure with large positive expansion can be suppressed in some solid solutions by substituting the A-site by a mixture of two cations. One such material, AlScMo3O12, was successfully synthesized using non-hydrolytic sol-gel chemistry. Depending on the reaction conditions, phase separation into Al2Mo3O12 and Sc2Mo3O12 or single-phase AlScMo3O12 could be obtained. Optimized conditions for the reproducible synthesis of stoichiometric, homogeneous AlScMo3O12 were established. High resolution synchrotron diffraction experiments were carried out to confirm whether samples were homogeneous and to estimate the Al:Sc ratio through Rietveld refinement and Vegard’s law. Single-phase samples were found to adopt the orthorhombic Sc2W3O12 structure at 100 to 460 K. In contrast to all previously-reported A2M3O12 compositions, AlScMo3O12 exhibited positive thermal expansion along all unit cell axes instead of contraction along one or two axes, with expansion coefficients (200–460 K) of αa = 1.7 × 10−6 K−1, αb = 6.2 × 10−6 K−1, αc = 2.9 × 10−6 K−1 and αV = 10.8 × 10−6 K−1, respectively.

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Section: Introductionmentioning

confidence: 99%

Low Temperature Synthesis and Characterization of AlScMo3O12

et al. 2015

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“…Furthermore, it has been reported that Y 2 Mo 3 O 12 partially amorphizes in air at temperatures below 403 K due to its hygroscopic behavior (Marinkovic et al, 2005). Hygroscopicity also was confirmed in all other tungstates and molybdates of the heavy rare earths from Lu to Ho (Wu et al, 2007b;Xiao et al, 2008a;Wu et al, 2009b;Wu et al, 2012;Wu et al, 2016). On the other hand, tungstates and molybdates of non-rare-earth A 3+ cations, which have smaller cationic radii, are not hygroscopic (Muller et al, 2019).…”

Section: Hygroscopicitymentioning

confidence: 96%

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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“…For example, the CTE of Sc 2 Mo 3 O 12 26,27 is −4.12 × 10 −6 K −1 with an operating temperature of up to 700 °C. Moreover, Yb 2 Mo 3 O 12 28 and Lu 2 Mo 3 O 12 29 have an accessible range of CTEs close to 600 °C. However, most of these materials are extremely easy to absorb moisture in air, with approximately 7% absorption.…”

Section: ■ Introductionmentioning

confidence: 99%

High Entropy Rare-Earth Molybdate Ceramics with Broad Operating-Temperature Window and Anti-Hygroscopicity Ability: A Promising Strategy for Negative Thermal Expansion Materials

Zhang

Zhou

et al. 2023

ACS Appl. Eng. Mater.

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Negative thermal expansion (NTE) has been an attractive topic in engineering application and functional materials. However, the narrow operating-temperature window and the hygroscopicity have become bottlenecks restricting the NTE behavior. In this work, a design strategy for effectively ameliorating the NTE property, rare-earth based high-entropy (Y 0.2 Yb 0.2 Er 0.2 Tm 0.2 A 0.2 ) 2 Mo 3 O 12 (A = Sc, Gd, Lu) (HE-RE 2 Mo 3 O 12 ) ceramics, is demonstrated for the first time. The assynthesized HE-RE 2 Mo 3 O 12 ceramics exhibit an orthorhombic crystal structure with a uniform distribution of rare-earth elements. Furthermore, the coefficients of thermal expansion (CTEs) of (Y 0 . 2 Yb 0 . 2 Er 0 . 2 Tm 0 . 2 Sc 0 . 2 ) 2 Mo 3 O 1 2 and (Y 0.2 Yb 0.2 Er 0.2 Tm 0.2 Lu 0.2 ) 2 Mo 3 O 12 ceramics are −4.96 × 10 −6 K −1 and −4.58 × 10 −6 K −1 with high service temperatures (100− 800 °C). Fascinatingly, the large ionic radius Gd(III) is incorporated into the orthorhombic (Y 0.2 Yb 0.2 Er 0.2 Tm 0.2 Gd 0.2 ) 2 Mo 3 O 12 ceramic, and a lower negative thermal expansion property (−0.76 × 10 −6 K −1 ) with broad operating-temperature window (100−800 °C) is achieved. Remarkably, the antihygroscopicity ability of the high-entropy specimens is improved, and the water absorption of such ceramics is reduced by 61.4%. Moreover, the improvements of the tunable thermal expansion and antihygroscopicity property of HE-RE 2 Mo 3 O 12 ceramics are ascribed to the lattice distortion effect. The present study provides a promising strategy for the development of NTE functional materials.

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Thermal expansion properties of Lu_2−xFe_xMo₃O₁₂

Cited by 21 publications

References 24 publications

Low Temperature Synthesis and Characterization of AlScMo3O12

Low Temperature Synthesis and Characterization of AlScMo3O12

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

High Entropy Rare-Earth Molybdate Ceramics with Broad Operating-Temperature Window and Anti-Hygroscopicity Ability: A Promising Strategy for Negative Thermal Expansion Materials

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