Thermal Expansion and Phase Formation of ZrW<sub>2</sub>O<sub>8</sub> Aerogels

Noailles, L. D.; Peng, Hong; Starkovich, John; Dunn, Brian C.

doi:10.1021/cm034791q

Cited by 24 publications

(18 citation statements)

References 22 publications

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“…Figure 1b shows the XRD spectrum of as-deposited thin film annealed at 740 °C; the product is a trigonal ZrW 2 O 8 thin film. The diffraction pattern is very similar to the one reported previously [9,14]. As shown in Fig.…”

Section: Methodssupporting

confidence: 88%

Preparation and properties of negative thermal expansion zirconium tungstate thin films deposited by radio frequency magnetron sputtering

Liu

Cheng

Zhang

2008

Physica Status Solidi (b)

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Zirconium tungstate (ZrW2O8) thin films were deposited on quartz substrates by radio frequency magnetron sputtering followed by annealing at various temperatures. The effects of post‐deposition annealing temperature on the phase, morphology and negative thermal expansion properties of the ZrW2O8 thin films were investigated. X‐ray diffraction data confirmed that the as‐deposited ZrW2O8 films were amorphous, and crystalline ZrW2O8 films could be obtained at high annealing temperature. Trigonal ZrW2O8 films could be prepared at 740 °C and cubic ZrW2O8 films could be prepared at 1200 °C. The surface morphologies of the ZrW2O8 thin films were evaluated using scanning electron microscopy. The results indicated that amorphous ZrW2O8 films were uniform and dense, and the grain size of the crystalline ZrW2O8 films became larger with increasing annealing temperature. The resulting cubic ZrW2O8 films showed negative thermal expansion, the average value of thermal expansion coefficient being –8.18 × 10–6 K–1 in the temperature range 15–700 °C. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Section: Methodssupporting

confidence: 88%

Preparation and properties of negative thermal expansion zirconium tungstate thin films deposited by radio frequency magnetron sputtering

Liu

Cheng

Zhang

2008

Physica Status Solidi (b)

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“…Indeed, we calculated the total thermodynamic γ (averaged over the modes) from the temperature derivatives of the elastic constants, d C ij /d T , 12a, and find that all MOFs have negative values (−3.12 for MOF-C6, −4.19 for MOF-C10, −4.63 for MOF-C16, −3.32 for MOF-C22, and −3.10 for MOF-C30).…”

Section: Resultsmentioning

confidence: 99%

“…Other NTE materials include perovskite ferroelectrics, tetrahedral semiconductors, ice, quartz, zeolites, and Prussian blue structural families , …”

Section: Discussionmentioning

confidence: 99%

Metal−Organic Frameworks Provide Large Negative Thermal Expansion Behavior

2007

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Using molecular dynamics (MD) simulations, we show that metal-organic frameworks (MOFs) constructed using octahedral Zn 4 O(CO 2 ) 6 clusters linked via aromatic carbon ring structures lead to negative thermal expansion (NTE) behavior (from 0 K to melting). We find that MOF-C22 contracts volumetrically by 1.9% over the range of 0 to 600 K, making it one of the best NTE materials (linear expansion coefficient of R ) -11.05 × 10 -6 K -1 compared with R ) -9.1 × 10 -6 K -1 found for ZrW 2 O 8, previously the champion NTE material). Indeed, we designed a new MOF using 2-butynediodate linkers that leads to an even larger NTE of 2.2% (from 0 to 500 K). We show that this NTE behavior arises because thermal motions in the rigid Zn-O clusters and the organic moieties linking them lead to tilting of the linkers by successively larger amounts from their alignment along the unit cell axes, resulting in decreased cell parameters. The MOF materials were developed to provide a large reversible hydrogen-storage capacity leading to as much as 73% free volume. However, the NTE properties suggest other possible applications. Thus, their porous but constrained three-dimensional framework provides a framework onto which other materials might blend to form composites with negligible volume change with temperature. To illustrate this, we incorporated polyethylene polymers into MOF-C10 and found that the volume of the composite is constant within 0.059% over the entire range from 300 to 600 K.

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“…In this paper analytical expressions for the CTE of laminates, with isotropic laminas, are developed for predicting the effective in‐plane and out‐of‐plane laminate CTE, with special emphasis on (i) alternating conventional (positive Poisson's ratio and positive thermal expansion) with non‐conventional (auxetic and NTE) laminas, and (ii) alternating auxetic (with positive thermal expansion) and NTE (with positive Poisson's ratio) laminas. Any type of NTE and auxetic laminas can be used, such as zirconium tungstate (ZrW 2 O 8 ) 85 and alpha‐cristobalite 86, respectively, so long as good bonding can be achieved between these laminas.…”

Section: Introductionmentioning

confidence: 99%

Coefficient of thermal expansion of stacked auxetic and negative thermal expansion laminates

Lim

2010

Physica Status Solidi (b)

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Analytical expressions for the in-plane and out-of-plane coefficients of thermal expansion for laminates with isotropic laminas are presented herein based on (i) zero net force on the laminate edges, (ii) equal displacement of the lamina edges, and (iii) Hooke's law in three dimensions. Results show that a laminate consisting of alternating auxetic (with positive coefficient of thermal expansion, CTE) and negative thermal expansion (NTE) (with positive Poisson's ratio) laminas exhibit a more negative effective CTE than a laminate of alternating conventional laminas (positive Poisson's ratio and positive CTE) with unconventional laminas (auxetic and NTE). Finally, temperature-dependent CTE for such laminates are developed and plotted for special cases. It is herein shown that under certain circumstances, the magnitude of temperature-dependent effective CTE tends to infinity. [47][48][49][50][51][52], and phase transition [53-56], among others. As a result of their novel properties, a number of applications have been suggested or developed using auxetic (e.g., in Refs. [57][58][59][60][61]) and NTE (e.g.,) materials. For example, auxetic materials have been identified for use in aerospace structural materials [6], while the CTE of dental fillings can be tailored to match that of the tooth to reduce thermal stress between the tooth and the dental filling or as composites that are useful for reducing thermal stresses in various applications [68]. To date, a number of studies on the effect of alternating positive and negative Poisson's ratio laminas on the effective laminate

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Thermal Expansion and Phase Formation of ZrW₂O₈ Aerogels

Cited by 24 publications

References 22 publications

Preparation and properties of negative thermal expansion zirconium tungstate thin films deposited by radio frequency magnetron sputtering

Preparation and properties of negative thermal expansion zirconium tungstate thin films deposited by radio frequency magnetron sputtering

Metal−Organic Frameworks Provide Large Negative Thermal Expansion Behavior

Coefficient of thermal expansion of stacked auxetic and negative thermal expansion laminates

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Thermal Expansion and Phase Formation of ZrW2O8 Aerogels

Cited by 24 publications

References 22 publications

Preparation and properties of negative thermal expansion zirconium tungstate thin films deposited by radio frequency magnetron sputtering

Preparation and properties of negative thermal expansion zirconium tungstate thin films deposited by radio frequency magnetron sputtering

Metal−Organic Frameworks Provide Large Negative Thermal Expansion Behavior

Coefficient of thermal expansion of stacked auxetic and negative thermal expansion laminates

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Thermal Expansion and Phase Formation of ZrW₂O₈ Aerogels