Tribolumineszenz bei Verformungsvorg�ngen fester K�rper

Thießen, P. A.; Meyer, K.

doi:10.1007/bf00607725

Cited by 18 publications

(15 citation statements)

References 9 publications

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“…It is evident from Table 1 that the value of E calculated from TL measurements is nearly the same as that obtained from other methods, which supports equation (1)…”

Section: =supporting

confidence: 80%

“…The impact stress 6 can be expressed as (7) From equations (1) and (2) Thus knowing the values of g , b' , t , A, b, and )1 ( Table 1) the value of E can be calculated from TL intensity measurements using equation (7). The value of the elastic constant E so obtained for tartaric acid crystals is 11 2 E = 2.610~10 dyn/cm .…”

Section: =mentioning

confidence: 99%

“…Introduction Triboluminescence is an integrating phenomenon, which includes mechanical, optical, and electrical properties of solids (1). It has been defined as the conversion of change in bonding energy into the energy of light (2).…”

mentioning

confidence: 99%

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Triboluminescence and determination of elastic constants of crystals

Das

Chandra

Tutakne

1972

Phys. Stat. Sol. (a)

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“…It is evident from Table 1 that the value of E calculated from TL measurements is nearly the same as that obtained from other methods, which supports equation (1)…”

Section: =supporting

confidence: 80%

Section: =mentioning

confidence: 99%

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Triboluminescence and determination of elastic constants of crystals

Das

Chandra

Tutakne

1972

Phys. Stat. Sol. (a)

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“…[86] To study the temperature dependence of the lifetimes of the excited states in more detail for [C 3 Triboluminescence: Tetrahalogenomanganates are wellknown emitters of tribo-induced radiation due to their piezoelectric properties, which can be excited through mechanical means when an applied electric field induces polarization of a suitable sample. [5,60,61] This results in a characteristic greenish emission when crystals of such Mn II compounds are rubbed. Triboluminescence could be observed when crystals of the tetrahalogenido salts were rubbed with a glass rod.…”

Section: Emission Decay Studiesmentioning

confidence: 97%

Synthesis, Structure, and Physico‐optical Properties of Manganate(II)‐Based Ionic Liquids

Pitula

Mudring

2010

Chemistry A European J

117

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Several ionic liquids (ILs) based on complex manganate(II) anions with chloro, bromo, and bis(trifluoromethanesulfonyl)amido (Tf(2)N) ligands have been synthesized. As counterions, n-alkyl-methylimidazolium (C(n)mim) cations of different chain length (alkyl=ethyl (C(2)), propyl (C(3)), butyl (C(4)), hexyl (C(6))) were chosen. Except for the 1-hexyl-3-methylimidazolium ILs, all of the prepared compounds could be obtained in a crystalline state at room temperature. However, each of the compounds displayed a strong tendency to form a supercooled liquid. Generally, solidification via a glass transition took place below -40 degrees C. Consequently, all of these compounds can be regarded as ionic liquids. Depending on the local coordination environment of Mn(2+), green (tetrahedrally coordinated Mn(2+)) or red (octahedrally coordinated Mn(2+)) luminescence emission from the (4)T(G) level is observed. The local coordination of the luminescent Mn(2+) centre has been unequivocally established by UV/Vis as well as Raman and IR vibrational spectroscopies. Emission decay times measured at room temperature in the solid state (crystalline or powder) were generally a few ms, although, depending on the ligand, values of up to 25 ms were obtained. For the bromo compounds, the luminescence decay times proved to be almost independent of the physical state and the temperature. However, for the chloro- and bis(trifluoromethanesulfonyl)amido ILs, the emission decay times were found to be dependent on the temperature even in the solid state, indicating that the measured values are strongly influenced by nuclear motion and the vibration of the atoms. In the liquid state, the luminescence of tetrahedrally coordinated Mn(2+) could only be observed when the tetrachloromanganate ILs were diluted with the respective halide ILs. However, for [C(3)mim][Mn(Tf(2)N)(3)], in which Mn(2+) is in an octahedral coordination environment, a weak red emission from the pure compound was found even in the liquid state at elevated temperatures.

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“…Observational evidence for optical glow under the brittle failure of certain dielectrics (Belyaev et al 1962;Deryagin et al 1973;Brooks 1965;Thiessen and Meyer 1970;Altier et al 1979) and seignette-electrics/ferroelectrics (Chandra and Shrivastava 1978) have been reported although this phenomenon is not typical for all matters. Brady and Rowell (1986) have studied the fracture of samples immersed in different gases.…”

Section: Optical Emissionsmentioning

confidence: 99%

Laboratory Study of Rock Deformation and Fracture

Сурков

Hayakawa

2014

Ultra and Extremely Low Frequency Electromagnetic Fields

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Our primary interest lies in the physics of electromagnetic phenomena associated with deformation and fracture of rocks. We start with a brief review of laboratory study of electromagnetic fields resulted from acoustic waves and shock polarization and magnetization effects in different materials. The vibration of charged dislocations and piezo-galvanic effect are considered to explain this effect in metals whereas the production and mobility of point and linear defects of atomic lattice is treated as a possible cause for the shock polarization effect in dielectrics. We discuss briefly a variety of electromagnetic phenomena caused by rock fracture. Among them are radiowave, optical and -radiation, and electron and ion emissions from fracturing rocks. We study the theories explaining the generation of strong electric fields in cracks and collapsing pores.Keywords Dislocation • Piezo-galvanic effect • Point defect • Rock fracture • Shock magnetization • Shock polarization Electromagnetic Effects Caused by Dynamic Deformation of a SolidIt is common knowledge that the dynamic deformation and fracture of solids are accompanied by a great variety of electromagnetic effects. The basic characteristics of these phenomena depend on the scales of fracture, intensity and duration of stress and strain, and a number of other factors. Such effects as generation of lowfrequency electromagnetic fields and radiowaves, emission of charged particles, light flashes, X -ray emission and micro-discharges inside of cracks have been observed in laboratory experiments (e.g., see Parrot 1995; Surkov 2000). It has been found experimentally that shock compression of different solids gives rise to a jump of electric potential at the shock front in all kinds of materials: metals, semiconductors, and dielectrics (e.g., Mineev and Ivanov 1976; Freund V. Surkov and M. Hayakawa, Ultra and Extremely Low Frequency Electromagnetic Fields, Springer Geophysics, DOI 10.1007/978-4-431-54367-1__9, © Springer Japan 2014 335 336 9 Laboratory Study of Rock Deformation and Fractureand Pilorz 2012). Effects of shock magnetization and demagnetization have been observed in magnetic materials. Fragments of fractured solid, as a rule, carry electric charges. The rock deformation and fracture can explain, in principle, some features of electromagnetic perturbations arising from large-scale tectonic processes such as EQs, volcanic eruptions and deeply buried high-yield detonations. In this section we first review laboratory studies and then examine these electromagnetic phenomena by analyzing the basic physical processes at microscopic level. Sometimes we will need to extend our research field to the frequency range of several MHz to gain a better insight into underlying mechanisms of these phenomena.

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Tribolumineszenz bei Verformungsvorg�ngen fester K�rper

Cited by 18 publications

References 9 publications

Triboluminescence and determination of elastic constants of crystals

Triboluminescence and determination of elastic constants of crystals

Synthesis, Structure, and Physico‐optical Properties of Manganate(II)‐Based Ionic Liquids

Laboratory Study of Rock Deformation and Fracture

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