Thermal expansion of Cr2xFe2−2xMo3O12, Al2xFe2−2xMo3O12 and Al2xCr2−2xMo3O12 solid solutions

Ari, Monica; Jardim, P.M.; Marinković, Bojan A.; Rizzo, F.; Ferreira, Fábio Furlan

doi:10.1016/j.jssc.2008.03.015

Cited by 73 publications

(52 citation statements)

References 32 publications

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“…This calibration curve was additionally verified and validated by following the phase transition from monoclinic to orthorhombic for different A 2 Mo 3 O 12 compounds and comparing it with DSC results [12].…”

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confidence: 88%

“…These structures present large chemical flexibility, meaning that the A 3+ cation can be a transition metal or rare earth that occupies an octahedral position, while M 6+ is generally W 6+ or Mo 6+ , although there is a report of P 5+ partially occupying this position [10]. It has been rationalized that the thermal expansion properties of this family are dependent on the size of the A 3+ cation [11], although some exceptions to this general rule have been recently observed and discussed [12]. Therefore, solid solutions with a mixture of different A 3+ cations can be produced in order to obtain new materials with controllable thermal expansion coefficients.…”

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confidence: 99%

“…Figure 4 Overall linear thermal expansion coefficients for molybdates and tungstates of the A 2 M 3 O 12 family, obtained by X-ray or neutron diffraction and dilatometry [12]. The values of linear thermal expansion coefficients for HfMgW 3 O 12 [15] and HfMgMo 3 O 12 (this paper) are added to the plot.…”

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confidence: 99%

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Low positive thermal expansion in HfMgMo₃O₁₂

Marinković

Jardim

Ari

et al. 2008

Physica Status Solidi (b)

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In the search for materials with negative thermal expansion, the HfMgMo3O12 phase has been synthesized and characterized for the first time. It is established that this phase belongs to a new class of ceramics with the general formula A4+B2+M6+3O12 that crystallizes in orthorhombic symmetry of space group Pnma (62) or Pna21 (33). No evidence is observed for any phase transition of orthorhombic HfMgMo3O12 through differential scanning calorimetry and high‐temperature X‐ray diffraction measurements in the investigated temperature range (298–1013 K). This new phase exhibits unusually low thermal expansion (αl = 1.02 × 10−6 K−1) as determined by high‐temperature X‐ray diffraction using a synchrotron source. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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confidence: 99%

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Low positive thermal expansion in HfMgMo₃O₁₂

Marinković

Jardim

Ari

et al. 2008

Physica Status Solidi (b)

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“…However, mixed A-site cations can also result in more complex behavior. For example, Ari et al reported that the phase transition temperatures of Al 2−x Cr x Mo 3 O 12 , Al 2−x Fe x Mo 3 O 12 and Cr 2−x Fe x Mo 3 O 12 obey the rule of mixtures, while the expansion coefficients show very distinct behavior in the different systems [58]. For Al 2−x Cr x Mo 3 O 12 and Cr 2−x Fe x Mo 3 O 12 , a linear decrease in the expansion coefficient with increasing fraction of Cr 3+ is observed, while Al 2−x Fe x Mo 3 O 12 compositions show more positive expansion coefficients than either Al 2 Mo 3 O 12 or Fe 2 Mo 3 O 12 , indicating that other factors must play a role as well.…”

Section: Introductionmentioning

confidence: 99%

“…This is intriguing, as In 2 W 3 O 12 adopts the monoclinic structure up to 473 K [59], while Al 2 W 3 O 12 undergoes the monoclinic-to-orthorhombic transition at 267 K [51]. The ability to not only tune expansion coefficients, but also suppress the undesirable phase transition to the monoclinic PTE phase is useful for potential applications [58]. A better understanding of how cation mixing influences phase transition behavior and stabilizes the orthorhombic NTE structure at lower temperatures is clearly desirable.…”

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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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Diffraction and Thermal Expansion of Solids

Tyagi

Achary

2010

Thermodynamic Properties of Solids

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Thermal expansion of materials is a topic of age-old interest to mankind in view of the chronological development of several devices and technologies [1,2]. The concept of thermal expansion and knowledge of thermal expansion coefficient of materials remain important for any structural materials experiencing a temperature gradient. The structural materials include any material used in technology to build a mechanically or electronically integrated physical entity. In particular, the thermal properties are of interest when any structural assembly faces a temperature variation. Thermal expansion effects have been well considered right from the metals and ceramic parts of cookwares to the highly sophisticated mechanical structures, such as buildings, bridges, air/spacecraft, vessels, kilns, furnaces, and so on. In particular, metals such as steel, copper, and so on that are important structural parts show a significant expansion with temperature. Thus, in all these materials, thermal expansion was exploited either to enhance or to nullify any temperature-induced dimensional instability, for example, the utilization of thermal expansion in automatic cut-off switch using bimetals is well known. The discovery of Invar (an alloy of 35% Ni and 65% Fe) and subsequent modified compositions as Elinvar, Kovar, Alnico, and so on have found immense applications in modern technologies, such as design of high-accuracy clocks, shadow mask in television screen, and so on [3]. In addition, low thermal expansion in fused silica and controllable thermal expansion in materials with glass and glass-ceramic compositions have been discovered and used in precise optical instruments, mirror substrates, glass-metal junctions [4,5]. A large number of crystalline materials with low thermal expansion are also discovered [6]. Thermal expansion data of ceramics have been a prime consideration in the designing of electrolyte and electrodes of solid oxide fuel cells [7]. Similarly, thermal expansion data of nuclear fuel materials are significant in preventing detrimental effects of fuel-clad interaction and unwanted swelling of fuel pins [8]. Nuclear reactor performance is mainly restricted by the thermal expansion and thermal conductivity of the fuel pellets under irradiation conditions. In these j197 applications, the material property is more significant than the structural assembly and hence the structural materials are tuned as per their thermal expansion behavior. However, the thermal expansion behavior of electronic materials causing temperature-induced dimensional instability leading to circuit failure also needs to be dealt with. Considering such aspects, several Invar-type alloys and metal matrix composites are developed in recent years [9]. Thus, the thermal expansion data of any material are the first requisite for the development of most of the technologies.In general, it is known that all materials expand or contract with the rise or fall of temperature. The thermal expansion of any material is explained as a relative change in dimens...

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Thermal expansion of Cr2xFe2−2xMo3O12, Al2xFe2−2xMo3O12 and Al2xCr2−2xMo3O12 solid solutions

Cited by 73 publications

References 32 publications

Low positive thermal expansion in HfMgMo₃O₁₂

Low positive thermal expansion in HfMgMo₃O₁₂

Low Temperature Synthesis and Characterization of AlScMo3O12

Diffraction and Thermal Expansion of Solids

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Thermal expansion of Cr2xFe2−2xMo3O12, Al2xFe2−2xMo3O12 and Al2xCr2−2xMo3O12 solid solutions

Cited by 73 publications

References 32 publications

Low positive thermal expansion in HfMgMo3O12

Low positive thermal expansion in HfMgMo3O12

Low Temperature Synthesis and Characterization of AlScMo3O12

Diffraction and Thermal Expansion of Solids

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Low positive thermal expansion in HfMgMo₃O₁₂

Low positive thermal expansion in HfMgMo₃O₁₂