Hybrid glasses from melt-quenched metal-organic frameworks (MOFs) have been emerging as a new class of materials, which combine the functional properties crystalline MOFs with processability glasses. However, only handful are meltable. Porosity and metal-linker interaction strength both identified crucial parameters in trade-off between thermal decomposition organic linker and, more desirably, melting. For example, inability prototypical zeolitic imidazolate framework (ZIF) ZIF-8 to melt, is...

The coefficient of thermal expansion ZrMgMo3O12 has been measured and was found to be extremely close zero over a wide temperature range including room (αl = (1.6 ± 0.2) × 10–7 K–1 from 25 450 °C by X-ray diffraction (XRD)). belongs the family AMgM3O12 materials, for which coefficients have previously reported low-positive low-negative. However, low property had not explained because atomic position information available any members this materials. We determined structure nuclear magnetic...

Due to the absence of microstructure and virtually infinite compositional versatility, glassy materials are perfect candidates for rational methods predict structure-property relationships. In most common models glass structure, a three-dimensional network backbone less-localized interstitial species taken as fundamental constituents glass. Such theoretical frameworks break down wide range glass-forming compositions in which covalent bonding does not percolate and, therefore, there is no...

Abstract Metal-organic framework (MOF) glasses have become a subject of interest as distinct category melt quenched glass, and potential applications in areas such ion transport sensing. In this paper we show how MOF can be combined with inorganic order to fabricate new family materials composed both glass domains. We use an array experimental techniques propose the bonding between domains, that composites produced are more mechanically pliant than itself.

Micro-Raman spectroscopy was used to determine the structural modifications occurring in a simple ion-exchanged glass. The base lithium silicate composition 30Li2O–70SiO2 studied as it underwent ion exchange, Li+ ↔ K+, at six temperatures spanning glass transition point. Using well-developed relationship between Si–O–Si bond angle, Si–O length, and Raman shifts, reduction network molar volume increase compressive stress were estimated. On basis of effect ion-exchange temperature, existence...

Abstract Metal-organic frameworks (MOFs) are intriguing host materials in composite electrolytes due to their ability for tailoring host-guest interactions by chemical tuning of the MOF backbone. Here, we introduce particularly high sodium ion conductivity into zeolitic imidazolate framework ZIF-8 impregnation with sodium-salt-containing ionic liquid (IL) (Na 0.1 EMIM 0.9 )TFSI. We demonstrate an exceeding 2 × 10 −4 S · cm −1 at room temperature, activation energy as low 0.26 eV, i.e .,...

Ionic glasses exhibit peculiar chemical formulations, atomic structures, and macroscopic properties. In particular, structure–property relationships cannot be explained using the classical network hypothesis; a standing challenge for understanding variations in ion mobility, vibrational dynamics non-linear mixing effects. Here, we report on substitution of oxygen by chlorine atoms [(Na2O)0.4-x/2(NaCl)x](B2O3)0.48(P2O5)0.12 up to degree around 10 %, effectively combining enhanced electrical...

Metal-organic framework (MOF) glasses have emerged as a new class of melt-quenched glasses; however, so far, all MOF glass production has remained at lab-scale; future applications will require large-scale, commercial parent crystalline MOFs. Yet, control synthetic parameters, such uniform temperature and mixing, can be challenging, particularly, when scaling-up mixed-linker or zeolitic imidazolate (ZIF). Here, we examine the effect heterogeneous linker distribution on thermal properties...

Structural heterogeneity is a common feature of all glasses, however, little known about the underlying contributions chemical fluctuations and modulations in free volume concrete glass forming systems. In this investigation, we relate dynamics structural relaxation (100-x)NaPO3–xAlF3 glasses to their heterogeneous structure as determined from multinuclear magnetic resonance spectroscopic analysis. For this, evaluate differential scanning calorimetry (DSC) data using integral isoconversional...

Characterization of nanoscale changes in the atomic structure amorphous materials is a profound challenge. Established X-ray and neutron total scattering methods typically provide sufficient signal quality only over macroscopic volumes. Pair distribution function analysis using electron (ePDF) scanning transmission microscope (STEM) has emerged as method probing nanovolumes these materials, but inorganic glasses well metal-organic frameworks (MOFs) many other containing organic components...

Abstract We report on the individual roles of charge carrier density and network modification in sodium ion conducting glasses from Na 2 O‐P O 5 ‐SO 3 ‐AlF (NAPFS) system. For this, a broad range glass compositions was considered across series 44Na O/(56 – x − y )P / AlF SO , 47Na O/(53 50Na O/(50 with = 8, 12, 16, 20 0, 5, 7, 10, 12. Impedance spectroscopy conducted these at frequencies 10 −2 to 6 Hz over temperatures 50 250°C, complemented by structural analyses using Raman nuclear...

We characterise mixtures of ZIF-8 and sodium fluoroaluminophosphate glass, this provides a framework for evaluating crystalline MOF inorganic glass pairings.

Variations in mechanical properties (stiffness and hardness) were measured as a function of case depth ion-exchange glasses using nanoindentation. A simple silicate composition, 30Li2O–70Si2O, was exchanged (Li+ ↔ K+) at several different temperatures, below above the glass transition, to evaluate effect exchange temperature on throughout layer. Significant enhancements Young's modulus hardness found near edge ion-exchanged attributed compressive stress mixed-alkali effect. Indent size...

Abstract Most studies of the mixed‐alkali effect (MAE) have focused on relating differences between cations to strength MAE; here we examine glass former by comparing MAE in aluminofluorophosphate (FP) and aluminosulfofluorophosphate (FPS) glasses. The sulfate anion FPS series does not bond directly aluminophosphate network, decreasing connectivity increasing ionicity increased degrees freedom imparted are evident single‐alkali glasses, which lower E a , hardness, shear moduli, Young's...

Abstract We report the effect of structural compaction on statistics elastic disorder in a silicate glass, using heterogeneous elasticity theory with coherent potential approximation (HET-CPA) and log-normal distribution spatial fluctuations shear modulus. The object our study, soda lime magnesia is compacted by hot-compression up to 2 GPa (corresponding permanent densification ~ 5%). Using THz vibrational spectroscopic data bulk mechanical properties as inputs, HET-CPA evaluates degree...

Given the ubiquity of glass formulations that are functionalized with silver compounds, electronic interaction between isolated cations and network deserves more attention. Here, we report structural origin optical properties result from doping in fluorophosphate (PF) sulfophosphate (PS) glasses. To achieve this, solid-state nuclear magnetic resonance (NMR) spectroscopy density functional theory (DFT) combined spectroscopic analysis physical property measurements. Comparing 31P NMR, 27Al 1d...

Abstract We report on the fabrication, properties, and structure of cerium pyrophosphate glasses partially substituted silicophosphates. In those glasses, occurs predominantly as Ce(III). A combination dynamic nuclear magnetic resonance electrical impedance spectroscopy is used to overcome problem assessing speciation. While optical unable quantify ratio Ce(III)/Ce(IV) due spectral overlap, proxy observations effect silica‐for‐cerium substitution extinction shape width UV band gap...

Hybrid glasses from melt-quenched metal-organic frameworks (MOFs) have been emerging as a new class of materials, which combine the functional properties crystalline MOFs with processability glasses. However, only handful vast variety identified being meltable. Porosity and metal-linker interaction strength both crucial parameters in trade-off between thermal decomposition organic linker and, more desirably, melting. For example, inability prototypical zeolitic imidazolate framework (ZIF)...

Understanding the interactions among dopant species and role of host lattice is fundamental importance for chemical formulation optically active glasses. Here, we consider archetypal pair Ag-Ce in complex fluorophosphate (PF) sulfophosphate (PS) matrices, which variable bonding environments ligand selectivity exert distinct effects on properties. The addition Ag+ to PF glasses blue-shifts ultraviolet (UV) cutoff wavelength Ce3+ enhances its photoluminescence (PL) intensity. In PS exact...

<p>Metal—organic frameworks (MOFs) are intriguing host materials in composite electrolytes due to their ability for tailoring host-guest interactions by chemical tuning of the MOF backbone. Here, we introduce particularly high sodium ion conductivity into zeolitic imidazolate framework ZIF-8 impregnation with sodium-salt-containing ionic liquid (IL) (Na0.1¬EMIM0.9)TFSI. We demonstrate an exceeding 2×10-4 S ⋅cm-1 at room temperature, activation energy as low 0.26 eV, i.e., highest...