Thermal dependency

The effect of thermal pre-strain treatment on the torsional ductility of the alloys is shown in Figure 9. The curve numbers correspond to the sample series numbers. The basic alloy, a = 0, is represented for comparison as series 4. The series 1 samples had the highest ductility. That of the j9-treated series 2 samples showed a similar thermal dependence below 970 K, but it was lower at 1000 to 1100 K. Ductility of the equilibrated series 3 samples did not show a maximum in its thermal dependence, but it exceeded ductility of the basic alloy. 

The form of the VTF equation normally used to fit the thermal dependence of the ionic conductivity is ... 

A novel second-order nonlinear optical medium which should offer considerable fabrication flexibility has been described. The physics of alignment of the highly nonlinearly polarizable moiety was discussed. However, observation of complex dynamical and thermal behavior indicates that an important role is played by the polymer liquid crystalline host. Additional properties of modified members of this family of lc polymers were consequently investigated. The explanations of guest alignment stabilization and thermal dependence of the alignability remain unresolved issues. 

Influence of Pressure on the Thermal Dependence of Magnetic Susceptibility 174... 

However, the replacement of two bpym molecules by weaker ligands such as pyridine (py) and particularly NCS affords the compound [Fe(bpym) (py)2(NCS)2]l/4py (Fig. 2). The average Fe-N bond length, 2.186(8) A, at room temperature, is consistent with an iron(II) ion in the HS state. The thermal dependence of XmT (XM=molar magnetic susceptibility, T=tempera-... 

In order to investigate the competition between magnetic interaction and spin transition in (bpym, S), quenching experiments have been performed at 0.63 GPa. Fig. 7 displays the magnetic behaviour of the quenched sample at increasing temperatures. It can be inferred from the thermal dependence of XmT that [HS-HS] entities can be frozen-in as a metastable state at low temperatures. Heating the sample above ca. 60 K leads to re-formation of... 

Fig. 44. Thermal dependence of coherently diffracted He intensities from Cu(100) and Cu(115). (Afier Ref. 112.)...

Fig. 48. Thermal dependence of the He specular peak height from Cu(l 10). The primary beam energy was 18.3 meV, and = fl, = 45°.

The magnetic term is associated with changes in internal energy related to magnetic transitions. Its thermal dependence leads to the magnetic entropy and enthalpy determination. The Schottky term comes from the excitation of higher lying crystal field levels in compounds with locahzed 5 f levels. 

Using X-ray spectrometry, De la Fuente et al. (1999) measured the thermal dependence of the a and c lattice parameters in a Er32/Lu 10)40 superlattice. Again, strong single-ion CEF contributions, originating from the Er/Lu interfaces, were observed in the volume and tetragonal distortions. Their analysis reveals also important contributions caused by epitaxial misfit. 

Ac-susceptibility measurements by Morellon et al. (2000) showed, that (on heating) Gdj(Sio.iGeo.9)4 undergoes a first-order transition from a ferromagnetic to an antiferromagnetic state at 7c = 81 K, followed by a second-order transition to the paramagnetic state at 7n = 127 K. Measurements of the thermal dependence of the lattice parameters... 

The short residence-times in the reactor give less time-thermal-dependent degradation of heat-sensitive products and/or substrates. 

---