Crystal field effects on the thermoluminescence of manganese in carbonate lattices

Calderón, T.; Townsend, P. D.; Benéitez, P.; García-Guinea, Javier; Millán, Alba; Rendell, H.M.; Tookey, A.; Urbina, M.; Wood, Roger

doi:10.1016/s1350-4487(97)82886-7

Cited by 68 publications

(26 citation statements)

References 24 publications

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“…A similar impurity dependence is shown in Fig. 7 in which the TL light intensity from the Mn impurity emission band of calcite is plotted as a function of the total impurity content of Mn 2+, Pb 2+ and Fe 3+ (Calderon et al, 1996). It is tacitly assumed that such a plot could be used as the basis for quantitative calibration of other samples, but as is evident from the TL results, the dependencies differ for the three TL glow peaks.…”

Section: Concentration Effects On Emission Wavelength and Intensitysupporting

confidence: 53%

“…Nevertheless, if one includes several of the stronger emission lines it is possible to discern a pattern of line movement with lattice parameter. Figure 9 presents data for the wavelength dependence with metal-oxygen lattice spacing (Calderon et al, 1996). Values derived from RL and TL of carbonates show two clear trend lines, corresponding to rhombohedral and orthorhombic lattices.…”

Section: Lattice Parameter and Wavelength Shifts Of Mn Luminescence Imentioning

confidence: 99%

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Recent examples of cathodoluminescence as a probe of surface structure and composition

et al. 1999

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Cathodoluminescence (CL) provides a sensitive analytical probe of the near-surface region of insulating materials, and some new examples of the strengths of the technique are presented using recent data from the University of Sussex. Analysis of float glass shows that by spectral and lifetime resolved data it is possible to separate the emission bands from excitonic, intrinsic imperfections, and impurities in various valence states, as a ftmction of their depth beneath the surface. Correlation of the CL data with those from Mrssbauer, ion beam and other analyses then provides the basis for models of the defect sites. CL from a second glass, ZBLAN, reveals the presence of microcrystallites and growth defects, and the work underpins confidence in the high purity gas levitation method of ZBLAN production. New results on CL of wavelength shifts with crystal field of Mn in carbonates are presented, and of Nd emission from Nd:YAG. The effects are directly linked to surface damage and dislocations caused by sample preparation steps of cutting and polishing. Methods to minimise the damage, by furnace or pulsed laser annealing, and chemical routes, are mentioned. Such surface preparation damage has a profound effect on all CL monitoring, whether for fundamental studies or mineralogical applications. Finally, a route to eliminate such problems is demonstrated, with consequent improvements in luminescence, transmission and laser performance of surface waveguides. The implications of improved surface quality range widely from mineralogical CL imaging through improved photonic materials and epitaxial growth to elimination of surface damage, and additional information.

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Section: Concentration Effects On Emission Wavelength and Intensitysupporting

confidence: 53%

Section: Lattice Parameter and Wavelength Shifts Of Mn Luminescence Imentioning

confidence: 99%

Recent examples of cathodoluminescence as a probe of surface structure and composition

et al. 1999

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“…Our CL spectra on gallbladder samples display similar spectral UV-blue luminescence emission, probably also explained by the electron gun being very energetic, striking electrons onto the hydrous organic matter and producing similar spectral CL emissions. Concerning the common broad band peaked at 620 nm, we suggested several years ago [16] that this could be explained by the crystal field effects of Mn 2þ ions in Ca 2þ structural positions in carbonated lattices or Ca-organometallic clusters. These analytical data of cathodoluminescence are believed to be the first-published CL results on gallbladder samples, and thus they could be regarded as reference for any related future studies.…”

mentioning

confidence: 96%

Characterization of Gallbladder Stones From Cholelithiasis Patients of Northern Greece, Using Complementary Techniques

Iordanidis

García-Guinea

Giousef

et al. 2013

Spectroscopy Letters

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The present study aims to characterize gallbladder stones surgically removed from patients dwelling in northern Greece. Combined techniques were employed, such as environmental scanning electron microscopy coupled with an energy dispersive system, l Raman spectroscopy, X-ray diffraction, and cathodoluminescence for the determination of morphological, microstructural, and compositional (chemical and mineralogical) characteristics. Four characteristic gallstones were determined: a black pigment, consisting of aragonite and bilirubin; a mixed stone, composed of calcite, oxalates, and phosphates; a cholesterol-rich stone; and a large stone, consisting of uric acid. The importance of using such mineralogical complementary techniques is emphasized in this work. It should be noted that this is the first published analytical characterization of gallbladder stones from northern Greece.

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“…[11] Concerning the spectra luminescence of calcite, we previously studied the crystal field effects on the luminescence of manganese in carbonate lattices, focusing the work on the orange-red spectrum region. [12] Nowadays the publications on calcite luminescence continue giving emphasis to the importance of the Mn 2þ activators in Ca 2þ positions [13] since many calcite specimens exhibit large red-orange luminescence emission and negligible or no luminescence in the UV-blue region of the spectrum. However, it is not the case of stressed calcite samples with hydroxyl groups, for example, limestone with maxima at 380 nm [14] or weathered marble.…”

Section: Introductionmentioning

confidence: 99%

Strong Calcite-Like Spectra Cathodoluminescence Emission from Allende Meteorite Cai Phases

García-Guinea¹,

Tormo²,

Azumendi³

et al. 2011

Spectroscopy Letters

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ABSTRAeT Calcium-aluminum-rich inclusions (CAl s) of Allende CV3 chondrite were studied by Environmental Scanning Electron Microscopy (ESEM), Energy Dispersive Spectrometry (EDS), Backscattering (BS), and Spectra Cathodoluminescence (CL). CAl minerals show spectra CL curves exceeding the 450,000 a.u. with a large homogeneity along the white inclusions. CL curve features fit perfectly with terrestrial patterns of stressed specimens of weathered marble and limestone in which hydroxyl groups may be involved. Crypto-clusters of CaC0 3 , undetectable by means of EPMA, EDS, and Micro-Raman techniques, coupled to the CAl phases are inferred from the spectral CL data and from the carbon and calcium contents provided by the EDS probe.KEYWORDS Allende, Ca-Al inclusions (CAls), calcite, cathodoluminescence, meteorite, spectra INTRODUCTIONAllende CV3 chondrite fragments have been extensively studied during the past 40 years, including by thermoluminescence (TL) and cathodoluminescence (eL) techniques, being remarkable in obtaining 780 hits introducing the topic = Allende and topic = Meteorite in the databas es = SCI -expanded of the ISE Web of Knowledge. This fact could be explained by the meteorite complexity from the perspectives of geology, astronomy and materials sciences, together with the advances of the analytical facilities allowing restudy specimens with improved techniques. Calcium-aluminum-rich inclusions (CAIs) found in the Allende CV3 chondrite are the oldest known materials formed in the solar systemYJ CAIs are composed of a suite of Caand Al-rich minerals such as spinel, melilite, pyroxene, and anorthite, which are predicted to be the first to condense from a cooling gas of solar composition.[2l Powdered fragments of the Allende meteorite, which fell in 1969 on Mexico, were initially studied from a thermoluminescent point of view (TL) to delineate its passage through the atmosphere.[3l A large number of Allende studies have focused on their Ca-Al-rich inclusions. I 4-61 The strong luminescence sensitivity of these materials continues being the subject of TL studies on pulverized aliquots, that is, luminescence techniques nonspectrally and nonspatially resolved [7] In the 1990s, improved CL imaging devices coupled to spectra CL detectors allowed performing more precise measurements on Allende chondrite minerals[SJ Recent studies on CL and Electron Probe Micro-Analysis (EPMA) of anorthite in Allende CAlS differentiate CL-bright and CL-dark domains, being those dark areas enriched in MgO (0.19 vs. 0.11 wt%) and Na20 (0.12 vs. 0.08wt%) compared to CL-bright domains, to discriminate differences in alteration histories[9J Minerals identified in Allende CAlS are anorthite, diopside, fassaite, hibonite, melilite, spinel, perovskite, grossular, monticellite nepheline, sodalite, and wollastonite[lOJ Occasionally, calcite is also cited in Allende CAl as a secondary phase together with hydrous silicate glass [ll] Concerning the spectra luminescence of calcite, we previously studied the crystal field effects on the lumin...

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Crystal field effects on the thermoluminescence of manganese in carbonate lattices

Cited by 68 publications

References 24 publications

Recent examples of cathodoluminescence as a probe of surface structure and composition

Recent examples of cathodoluminescence as a probe of surface structure and composition

Characterization of Gallbladder Stones From Cholelithiasis Patients of Northern Greece, Using Complementary Techniques

Strong Calcite-Like Spectra Cathodoluminescence Emission from Allende Meteorite Cai Phases

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