Disordered glassy phase

Their measurements showed TeXch 15 s at 45 K and 236 s at T=24K. This demonstrates that dynamic intra-H-bond deuteron disorder O-D- O <-> O- D-O is still present in DRADA at low temperatures in the glassy phase. A measure-... 

Fig. 2 Schematic of dilation mechanism that is a prerequisite for the flow of solids. (A) In undisturbed state, grains are interlocked and behave much like an ordinary solid. (B) A granular bed dilates in response to applied shear, and can then flow. (C) In the flowing state, the bed can form distinct crystalline, glassy, fluid-like and gas-like phases. The crystalline phase is regular and ordered, the glassy phase is disordered but static, the fluid-like state flows but exhibits enduring contacts, and the gas-like state is characterized by rapid and brief interparticle contacts.

The rubbery plateau also represents an indicator of miscibility (Badia et al. 2015). Linear triblock copolymers composed of poly(n-butyl acrylate) and polystyrene (PS-PBA-PS) have phase-separated morphologies exhibiting two rnbbery plateaux (Pakula et al. 2011). The first plateau lies between the Tg of the PBA blocks and the Tg of the PS blocks in this region, the glassy PS microdomains act like physical crosslinks for the flexible PBA blocks. The second rubbery plateau starts after the Tg of PS and continues until the order-disorder transition, where the microdomain strncture transforms into a disordered homogeneous phase (Han et al. 1989). The length and the storage modnlns of the rubbery plateau depend on the molecular... 

In addition, many of the ferroelectric solids are mixed ions systems, or alloys, for which local disorder influences the properties. The effect of disorder is most pronounced in the relaxor ferroelectrics, which show glassy ferroelectric behavior with diffuse phase transition [1]. In this chapter we focus on the effect of local disorder on the ferroelectric solids including the relaxor ferroelectrics. As the means of studying the local structure and dynamics we rely mainly on neutron scattering methods coupled with the real-space pair-density function (PDF) analysis. 

Microhardness (MH), has been shown to be a convenient additional technique to detect accurately the ferro to paraelectric phase changes in these copolymers. The increase of MH as a function of VF2 polar sequences observed at room temperature is correlated with the contraction of the p-all-trans unit cell On the other hand, the fast exponential decrease of MH with increasing temperature, observed above Tc, is similar to that obtained for glassy polymers above Tg and suggests the existence of a liquid crystalline state in the high temperature paraelectric phase. This phase is characterized by a disordered sequence of conformational isomers (tg-, tg+, tt) as discussed for Condis crystals [109]. 

Y NMR has also been reported extensively from yttrium sialon ceramics. Yttria is an important sintering aid for densifying silicon nitride. The properties of the sialon produced are determined by the nature of the grain boundary phase, which is usually a crystalline or glassy yttrium sialon. The often disordered nature of such phases can mean that broader 89Y resonances are... 

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