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The spring-defect model developed by us in the accompanying paper I to discuss ferroelasticity, exhibited in the BCT phase
of α-iron (BCC metals), is used to analyse anelastic relaxation across the paraelastic to ferroelastic phase transition. The
kinetics of the underlying Hamiltonian representing strain-strain interactions is treated within mean-field theory. The relaxation-response
relation of the linear response theory is employed to derive explicit expressions for the anelastic strain, the frequency-dependent
compliance and the internal friction in terms of the basic parameters of the spring-defect model. 相似文献
23.
Sudheer Kumar Sushanta K. Samal Smita Mohanty Sanjay K. Nayak 《高分子科学杂志,A辑:纯化学与应用化学》2018,55(6):496-506
A novel renewable resource based tri-functional epoxy resin from itaconic acid (TEIA) was blended with petroleum based epoxy resin (DGEBA) and fabricated at different ratios. Then, it was by thermally cured with methylhexahydrophthalic anhydride (MHHPA) in presence of 2-methylimidazole (2-MI) catalyst. The tensile, modulus, strength of virgin epoxy resin (41.97 MPa, 2222 MPa) increased to 47.59 MPa, 2515 MPa, respectively, with the addition of 30% of TEIA. The fracture toughness parameter, critical stress intensity factor (KIC) revealed enhancement of toughness in the TEIA bio-based blends system. The thermomechanical properties of TEIA (tri-functional epoxy resin from itaconic acid) modified petroleum-epoxy networks were investigated by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and dynamic mechanical analysis (DMA). The fracture morphology was also studied by the scanning electron microscopy and atomic force microscopy respectively. 相似文献
24.
Dutta Debajani Roy Sushanta Kumar Das Bodhaditya Talukdar Anup K. 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2018,92(5):976-983
Russian Journal of Physical Chemistry A - The present work deals with the adsorption of Cu2+ and Pb2+ on zeolites (ZSM-5, mordenite) and mesoporous materials (MCM-48, MCM-41). The characterization... 相似文献
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B. P. Mukhopadhyay J. K. Dattagupta Guy H. Evrard 《Journal of chemical crystallography》1991,21(4):507-510
The crystal structure of (±)-phenylpropanolamine has been determined by single-crystal X-ray diffraction methods. The structure was solved by direct methods and refined by least-squares toR=0.055 andR
w=0.045 for 2000 reflections (I2 (I)). The molecule was found to adoptgauche geometry. Inter- and intramolecular N-HO and O-HN hydrogen bonds were observed in the crystal structure. 相似文献
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V3Si exhibits an ultrasonic anomaly when cooled well below its martensitic and superconducting transition temperatures (T
m andT
c), and a magnetic field is applied on to the sample. The anomaly is thought to be due to reorientation of microdomains formed
belowT
m, to energetically favourable configurations. The effect disappears when the domains are stabilised in new configurations
in the presence of the magnetic field. An analysis of these results is presented in this paper by relating the ultrasonic
attenuation coefficient to strain fluctuations, arising here from domain reorientations. The treatment is based on a master
equation for the probability matrix whose elements yield the probabilities of transitions between domain configurations, in
the presence of both the magnetic field and the stress wave. Arguments for the validity of this master equation, when the
oscillatory stress is weak, are given in a longish appendix. The derived results are used to analyse, in qualitative terms,
the observed experimental facts. Also, new measurements are suggested which may help interpret the experimental data in a
satisfactory manner. 相似文献