Features Of Structural Transitions Research Articles

Structural Transitions During Orientational Drawing of Yarns. Review

Known data are generalized on the structural transitions and orientational strengthening of yarns made from different polymers, from the standpoint of the current state of the art. Their characteristic features as well as the similarities and differences for processes forming the structural and mechanical properties are demonstrated. Consideration of the process of orientational drawing of PET is emphasized, letting us show the characteristic features of structural transitions from the amorphous to the crystalline state. Material in this paper has combined basic scientific data on problems of orientational strengthening, which is quite important in the current stage of development of polymer technology for designing new processes.

Features of structural phase transitions in Ca 2−xSm xMnO 4

Features of structural transitions in Ca 2− x Sm x MnO 4 have been investigated by means of electron diffraction. When the temperature is lowered from a high-temperature tetragonal (HTT) phase in x = 0.3, there are successive transitions from the HTT phase to a low-temperature orthorhombic (LTO) one at 300 K and further to a low-temperature tetragonal (LTT) one at 100 K. In electron diffraction patterns, satellite spots with q ̄ = 1 8 〈110〉 also appear below about 290 K. Features of the satellite spot arc that it is observed in 0.1 ≤ x ≤ 0.35 and its location depends on x.

Structural transitions in B a1− xM xBiO3(M = K, Rb)

Features of structural transitions in B a1− x K x BiO 3 (BKB) and B a1− x Rb x BiO 3 (BRB) have been investiga electron diffraction. The analysis of the patterns shows that the crystal system at room temperature changes with respect by means of to x; the cubic system in x > 0.35 and the monoclinic one in 0.1 < x < 0.35. When the temperature is changed the cube to monoclinic transition takes place in 0.1 < x < 0.35. In addition, the softening of a phonon mode at the R point is observed in the cubic structure of x > 0.35.

Features of structural transitions in gelatin over a wide range of temperatures

Features of structural transitions in gelatin over a wide range of temperatures