The Cooperativity of Atomic Fluctuations in Highly Supercooled Glass-Forming Metallic Melts.

The behavior of supercooled glass-forming metals depends on the cooperative atomic fluctuations caused by dynamic heterogeneities in the melt. These spatial and temporal heterogeneities form dynamic clusters, which are regions of cooperative rearrangement (CRR). In this study, the macroscopic kinetics and the correlation length , of the CRR, are derived for PtCuNiP and PdCuNiP metallic glass-formers by fast differential scanning calorimetry near the glass transition.

Energy Absorption and Beam Damage during Microfocus Synchrotron X-ray Diffraction.

In this study, we combine fast differential scanning calorimetry (FDSC) with synchrotron X-ray measurements to study simultaneously the structure and thermophysical properties of materials. Using the example of the organic compound BCH-52, we show that the X-ray beam can heat the sample and induce a shift of the heat-flow signal. The aim of this paper is to investigate the influence of radiation on sample behavior.

Influence of Chemical Composition and Structure on the Cooperative Fluctuation in Supercooled Glass-Forming Liquids.

The kinetics of the glass transition and the characteristic size of the fluctuating spatio-temporal domains in supercooled glass-forming liquids, i.e., the Cooperatively Rearranging Regions (CRR), were measured upon cooling over a broad range of cooling rates using Differential Scanning Calorimetry (DSC) and chip-based Fast Scanning Calorimetry (FSC).

Glass transition temperatures and crystallization kinetics of a synthetic, anhydrous, amorphous calcium-magnesium carbonate.

We report the first calorimetric observations of glass transition temperatures and crystallization rates of anhydrous, amorphous calcium-magnesium carbonate using fast scanning differential scanning calorimetry. Hydrous amorphous CaMgCO · 0.5HO (ACMC) solid was precipitated from a MgCl-NaHCO buffered solution, separated from the supernatant, and freeze-dried.

Effect of water on the glass transition of a potassium-magnesium carbonate melt.

Calorimetric measurements of the glass transition temperatures () of hydrous carbonate melts are reported on a near-eutectic composition of 55 mol% KCO - 45 mol% MgCO with up to 42 mol% bulk HO dissolved in the carbonate melt. Hydrous melts were quenched from 750°C to transparent and crystal-free glasses and were subsequently analysed for water content before and after measuring by high-sensitivity differential scanning calorimetry. The glass transition and limited fictive temperatures as a function of the water content were determined at 10 K/min cooling/heating rates resulting in ranging from 245°C at nominally anhydrous conditions to 83°C in the presence of 42 mol% HO in the glass.