Electron Spin-Lattice Relaxation in Polymers and Crystals Related to Disorder and Structure Defects

• Authors: S. Hoffmann , W. Hilczer , T. Radczyk , I. Polus
• Languages of publication: EN

Abstracts

EN

Temperature dependences (4-300 K) of the electron spin-lattice relaxation have been determined by electron spin echo technique for free radicals in two polymeric systems: phenol-formaldehyde resin and polyhydrazodisulphide. The dependences are described in terms of dynamics specific for amorphous systems involving two-level tunnelling states at low temperatures, exchange-coupled clusters of paramagnetic centres and local oscillators. Some universal temperature behaviour of the spin-lattice relaxation of amorphous systems is suggested, with a strong increase in relaxation rate with temperature at low temperatures and much weaker increase above 50 K with characteristic linear temperature dependence in a broad temperature range and cosech(Δ/kT) -type behaviour. It is also shown that the amorphous-type behaviour appears in low temperatures relaxation studies of single crystals but it is due to a non-uniform distribution of doped paramagnetic ions. Such behaviour we have found in Tutton salt crystals doped with Cu^{2+}, as well as for free radical centres produced by ionising irradiation in (NH_4)_3H(SeO_4)_2 and Li(N_2H_5)SO_4 single crystals, where extended phonons are suppressed around radiation damage centres suggesting a local amorphisation of the crystal structure.

Keywords

EN

61.41.+e; 61.80.-x; 76.30.-v

Discipline

• 61.41.+e: Polymers, elastomers, and plastics(see also 81.05.Lg in materials science; for rheology of polymers, see section 83; for polymer reactions and polymerization, see 82.35.-x in physical chemistry and chemical physics)
• 61.80.-x: Physical radiation effects, radiation damage(for photochemical reactions, see 82.50.-m; for effects of ionizing radiation on biological systems, see 87.53.-j)
• 76.30.-v: Electron paramagnetic resonance and relaxation(see also 33.35.+r Electron resonance and relaxation in atomic and molecular physics; 87.80.Lg Magnetic and paramagnetic resonance in biological physics)

• Journal: Acta Physica Polonica A
• Year: 2003
• Volume: 103
• Issue: 4
• Pages: 373-385

Dates

published

2003-04

received

2002-08-16

revised

2002-11-21

(unknown)

2002-12-18

Contributors

author

S. Hoffmann

• Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland

author

W. Hilczer

• Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland

author

T. Radczyk

• Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland

author

I. Polus

• Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland

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Identifiers

DOI

10.12693/APhysPolA.103.373