Thermoluminescence from natural calcites

Calderón, T.; Aguilar, M.; Jaqué, F.; Coy-Yll, R.

doi:10.1088/0022-3719/17/11/021

Cited by 62 publications

(20 citation statements)

References 18 publications

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“…It can be seen as a separate band only at a temperature of 293 K; when the temperature is lowered down to 80 K, the Mn 2+ band disappears. A decrease in the intensity of the Mn 2+ band when the temperature is lowered has also been noted in [5]. Figure 2 shows the luminescence kinetics of the Siberian calcite at a wavelength of 450 nm, the experimentally measured time dependence of the laser pulse I(t), the measured and calculated (in good agreement with experiment) time dependence of the luminescence intensity L(t) after exposure to the nitrogen laser pulse, and also the calculated electron population m(t) of the metastable level of the luminescence center.…”

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confidence: 68%

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Photoluminescence of calcite crystals of different origins

Rammo

Sägi

2006

J Appl Spectrosc

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We have studied the photoluminescence of calcite crystals. In the blue region of the photoluminescence spectrum of calcite crystals obtained from Siberia (Russia) and from Saaremaa Island (Estonia), three strongly overlapping luminescence bands due to intrinsic defects are observed. Luminescence due to impurities in the crystals are hardly detectable. The experimentally measured time dependence of the luminescence intensity for the indicated luminescence bands is compared with the dependences obtained as a result of a calculation based on a proposed model for the luminescence center. Better agreement between experiment and calculation is achieved if the model of the luminescence center includes a metastable level with electron ejection energy of 4 meV; the characteristic time for the radiative transition is 1.3 nsec. Studying the time dependence of the luminescence at different wavelengths within the indicated bands allows us to conclude that the photoluminescence (three bands) is due to one type of luminescence center.Introduction. Calcite is of interest for geology because it can be used for luminescent dating of various specimens. In nature, calcite is encountered within both biological and geological specimens, and so the possibilities for its use in dating are quite broad. Up to now, the thermoluminescence method has been used for dating using calcite [1,2]. At the same time, the optically stimulated luminescence method has been successfully used for some minerals (for example, quartz and feldspar) [3].In this work, we have studied the short-wavelength portion of the luminescence spectrum of calcite in order to refine the mechanism of luminescence in calcite and to expand the possibilities for using this compound in luminescent dating. Most researchers (see, for example, [3][4][5][6][7][8]) believe that luminescence of undoped calcite is observed in the blue region of the spectrum (400-450 nm). But in [6,7], it is suggested that the luminescence bands at wavelengths of 520 nm, 575 nm, and 640-660 nm are also not associated with impurities. The luminescence of undoped calcite has not been sufficiently studied, and different researchers have presented different spectra for it. This may be due to the fact that the luminescence originates from different intrinsic defects in the calcite and also the fact that the spectrum of the relatively weak luminescence of intrinsic defects is distorted by the luminescence of poorly studied impurities. For example, according to the data in [9], in the 400-500 nm region of the spectrum, we may encounter luminescence bands that can be attributed to Eu 2+ impurity. All the indicated luminescence bands are quite weak compared with the luminescence due to Mn 2+ impurity, the luminescence of which more or less masks the bands due to intrinsic defects [4]. The luminescence of Mn 2+ impurity with maximum at about 590-620 nm has been studied more completely.The experiment. The calcite crystals were placed into a cryostat, which made it possible to make the measurements both at 293 K a...

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“…Most researchers (see, for example, [3][4][5][6][7][8]) believe that luminescence of undoped calcite is observed in the blue region of the spectrum (400-450 nm). But in [6,7], it is suggested that the luminescence bands at wavelengths of 520 nm, 575 nm, and 640-660 nm are also not associated with impurities.…”

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confidence: 99%

Photoluminescence of calcite crystals of different origins

Rammo

Sägi

2006

J Appl Spectrosc

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“…Therefore, the similarity of the activation energy in the process of temperature quenching and lattice vibration energy indicates that the temperature quenching energy might be transferred as a phonon to the specific lattice vibration through non -radiative transition. Machel et al (1991) attribute "background blue" to an intrinsic defect center related to calcite CL independent of impurities, in which case the defect centers that were found in calcite contained almost no activators and quenchers, presumably because of an electron transition of Ca + to CO 3− (Calderón et al, 1984). Furthermore, Habermann et al (1999) noticed that electron -induced defect centers in calcite attributed to the emission bands at 520 nm to 660 nm overlapped with the range of Mn activation in addition to the blue band at 400 nm.…”

Section: Resultsmentioning

confidence: 99%

Blue cathodoluminescence related to defect center in smithsonite

Nishido

Makio

Kusano

et al. 2013

Journal of Mineralogical and Petrological Sciences

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Smithsonite occasionally exhibits a characteristic blue emission, known as cathodoluminescence (CL), which can be assigned to a lattice defect center by CL spectral analysis. The intensity of this emission is reduced at higher temperatures, suggesting a temperature quenching phenomenon. The activation energy in the quenching process was evaluated by a least -square fit of the Arrhenius plots using the integrated intensity of the emission component, and was found to be ~ 0.03 eV for the defect center. According to the Mott -Seitz model, the quenching process can be interpreted by an increase in non -radiative transition at higher temperatures. The value of the activation energy for a blue emission caused by the defect center corresponds to the vibration energy of the O -Zn -O bending mode in the lattice. It implies that the temperature quenching energy might be transferred as a phonon to the specific lattice vibration.

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“…В рассматриваемой области спектра от 1.7 до 2.6 eV наблюдается ряд сильно наложенных друг на друга полос. [27][28][29][30][31][32]. Видно, что после воздействия ударной волны интенсивность всех полос в области 1−4 eV уменьшилась в ∼ 4 раза.…”

Section: данные фл спектроскопииunclassified

Трансформация Структуры Поверхности Мрамора Под Влиянием Ударной Волны

Щербаков¹,

Веттегрень²,

Башкарев³

et al. 2018

Журнал Технической Физики

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Методами рамановской, инфракрасной и люминесцентной спектроскопии исследовали строение осколков, образовавшихся после разрушения мрамора под действием ударной волны. Обнаружено, что в поверхност-ном слое осколков толщиной ∼ 2 µm кальцит I трансформировался в высокобарическую фазу -кальцит III. Одновременно концентрация примесных ионов Mn 2+ , Eu 3+ и др. уменьшилась в ∼ 4 раза.

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Thermoluminescence from natural calcites

Cited by 62 publications

References 18 publications

Photoluminescence of calcite crystals of different origins

Photoluminescence of calcite crystals of different origins

Blue cathodoluminescence related to defect center in smithsonite

Трансформация Структуры Поверхности Мрамора Под Влиянием Ударной Волны

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