On the possible effect of a magnetic field on the breaking of mechanically loaded covalent chemical bonds

Zakrevskii, V. A.; Pakhotin, V. A.; Shul’diner, A. V.

doi:10.1134/1.1521460

Cited by 11 publications

(2 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Note that, in the study of the effect of the magnetic field by the EPR method, Zakrevski oe et al [8] did not reveal the breaking of covalent bonds. Most likely, the orientation of the magnetic moment of molecular groups under the action of the magnetic field insignificantly affects preliminarily oriented strong covalent bonds when the molecular mobility is suppressed by strong mechanical orientation.…”

Section: Introductionmentioning

confidence: 94%

10.1007/s11451-008-1033-0

2010

CrossRef Listing of Deleted DOIs

View full text Add to dashboard Cite

The effect of a constant magnetic field on the rate of jumplike creep under compression is investigated for vitreous polymers with a globular structure. The interferometric method used for recording the creep makes it possible to measure deformation jumps from 300 nm and larger. It is demonstrated that the sizes of deformation jumps in polyester and epoxy resins decrease in the magnetic field ( B = 0.2 T). Taking into account that the deformation jump size corresponds to the size of structural inhomogeneities, it is assumed that macroglobules under the action of a constant magnetic field are separated into smaller structural units on the nanometer level.

show abstract

Section: Introductionmentioning

confidence: 94%

10.1007/s11451-008-1033-0

2010

CrossRef Listing of Deleted DOIs

View full text Add to dashboard Cite

show abstract

“…It was shown in [15] that, when considering the influence of magnetic field on the optical properties of nonconducting crys tals, one should take into account the reorientation of particle spins and the fact that the optical properties of crystals in strong magnetic fields may depend signifi cantly on the mutual orientation of the spin magnetic moments of particles. However, this concept of magnetically induced phenomena creates a number of problems [13,14]. First of all, the specific types of spin dependent phys icochemical processes (reactions), through which magnetic field changes particular properties of solids, are to be determined.…”

Section: Condensed Matter Spectroscopy a New Magneto Optical Effect Imentioning

confidence: 99%

A new magneto-optical effect in birefringent crystals doped with paramagnetic impurities

2012

View full text Add to dashboard Cite

It is known that an external magnetic field can sig nificantly affect the optical properties of materials placed in it. To date, the main magneto optical phe nomena-the Zeeman effect (splitting of the energy levels of atoms and molecules), Faraday effect (rota tion of the light polarization plane), and CottonMouton effect (occurrence of birefringence in isotro pic media)-have been studied fairly well and are widely applied in both research and practice [1]. The common property of the aforementioned effects is that they can be observed only in the presence of magnetic field, their inertia (occurrence and disappearance times) with respect to external magnetic field being fairly low (~10 -9 s or less) [2].At the same time, a number of experiments have revealed changes in different macroscopic (including optical) properties of matter under constant or pulsed magnetic fields, both weak and strong. These changes are retained after switching off the magnetic field (i.e., they are long term or irreversible [3][4][5][6][7][8][9]). In addition, it was found experimentally that the magnetoplastic and magneto optical phenomena are correlated; i.e., a change in the mechanical properties of a crystal exposed to a magnetic field (В ~30 T) affects somehow the parameters of the magneto optical phenomena observed in this crystal and vice versa [10].The results of experimental study of the influence of a strong pulsed 40 T magnetic field on the birefrin gent properties of uniaxial and biaxial crystals doped by transition and rare earth ions are reported below. The purpose of the experiment was to detect long term (or irreversible) changes in the optical properties of the crystals exposed to a magnetic field.The samples were quartz crystals doped with iron impurity (≈0.8% wt %), as well as crystals of potassium yttrium tungstate (KYW) and potassium gadolinium tungstate (KGW); the tungstates were doped with Yb 3+ ions in atomic concentrations of ≈20% and ≈2%, respectively. These materials have been studied well and are widely applied in optics, optoelectronics, and quantum electronics.The samples were rectangular plane parallel plates with sizes of 12 × 10 × 3 (quartz), 26 × 10 × 2 (KGW), and 24 × 9 × 0.6 (KYW) mm. The principal axes of the indicatrix of the KGW and KYW refractive indices, n g , n m , and n p , were oriented so as to make the n g axis nor mal to the plate plane and the projections of the n p and n m axes on this plane approximately coincide with the directions of the larger and lesser plate sides, respec tively. The optical axis of the quartz plate made an angle of 18.1° with its plane.The experiment was performed at room tempera ture. The birefringence value was determined using crossed polarizers. The crystal plate was placed on the rotating stage of goniometer so as to orient vertically the larger side of the plate and make the rotation axis of the stage coincide with the symmetry axis of the plate (Fig. 1). A beam of a He-Ne laser (a source of linearly polarized probe radiation) passed successively through a pola...

show abstract