The Relationship between Microhardness and Glass Transition Temperature of Chalcogenide Glasses

Tver’yanovich, Yu. S.

doi:10.1134/s1087659622040149

Cited by 6 publications

(1 citation statement)

References 15 publications

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“…The results agree well with the higher ΔH fus and E values of G-Mg-adp. [26][27][28] Higher hardness implies that the material is stronger; however, it can be easily fractured. Meanwhile, a higher H 2 /E ratio indicates greater external stress tolerance until fracture.…”

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confidence: 99%

Melt-quenched Carboxylate Metal–Organic Framework Glasses

Kim

Lee

Seo

et al. 2023

Preprint

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Although carboxylate-based frameworks are commonly used architectures in metal-organic frameworks (MOFs), liquid/glass MOFs have thus far mainly been obtained from azole- or weakly coordinating ligand-based frameworks.1,2 This is because strong coordination bonds of carboxylate ligands to metals block the thermal vitrification pathways of carboxylate-based MOFs.3 In this study, we present the first example of carboxylate-based melt-quenched MOF glasses comprising Mg2+ or Mn2+ and an aliphatic carboxylate ligand, adipate. These MOF have a low melting temperature (Tm) of 284 °C, compared to zeolitic-imidazolate framework (ZIF) glasses,4,5 and superior mechanical properties in terms of hardness and elastic modulus.6 The low Tm is due to the flexibility and low symmetry of the aliphatic carboxylate ligand (raising entropy of fusion (ΔSfus))7,8 and the lack of crystal field stabilization energy on metal ions (reducing enthalpy of fusion (ΔHfus)).9 This research will serve as a cornerstone for the integration of numerous carboxylate-based MOF into MOF glasses.

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Section: Full Textmentioning

confidence: 99%

Melt-quenched Carboxylate Metal–Organic Framework Glasses

Kim

Lee

Seo

et al. 2023

Preprint

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Melt-quenched carboxylate metal–organic framework glasses

Kim,

Lee,

Seo

et al. 2024

Nat Commun

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Although carboxylate-based frameworks are commonly used architectures in metal-organic frameworks (MOFs), liquid/glass MOFs have thus far mainly been obtained from azole- or weakly coordinating ligand-based frameworks. This is because strong coordination bonds of carboxylate ligands to metals block the thermal vitrification pathways of carboxylate-based MOFs. In this study, we present the example of carboxylate-based melt-quenched MOF glasses comprising Mg2+ or Mn2+ with an aliphatic carboxylate ligand, adipate. These MOFs have a low melting temperature (Tm) of 284 °C and 238 °C, respectively, compared to zeolitic-imidazolate framework (ZIF) glasses, and superior mechanical properties in terms of hardness and elastic modulus. The low Tm may be attributed to the flexibility and low symmetry of the aliphatic carboxylate ligand, which raises the entropy of fusion (ΔSfus), and the lack of crystal field stabilization energy on metal ions, reducing enthalpy of fusion (ΔHfus). This research will serve as a cornerstone for the integration of numerous carboxylate-based MOFs into MOF glasses.

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Relationship of Temperature Dependences of Microhardness and Enthalpy of Glass on the Example of Selenium

Wang,

Tver’yanovich

2023

Glass Phys Chem

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The Relationship between Microhardness and Glass Transition Temperature of Chalcogenide Glasses

Cited by 6 publications

References 15 publications

Melt-quenched Carboxylate Metal–Organic Framework Glasses

Melt-quenched Carboxylate Metal–Organic Framework Glasses

Melt-quenched carboxylate metal–organic framework glasses

Relationship of Temperature Dependences of Microhardness and Enthalpy of Glass on the Example of Selenium

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