Influence of different annealing conditions on the luminescent properties of Li2B4O7:Mn single crystals

Holovey, V. M.; Sidey, Vasyl; Lyamayev, V.; Birov, M.M.

doi:10.1016/j.jpcs.2007.02.005

Cited by 20 publications

(17 citation statements)

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“…Srivastava [36] founded his studies on a radiation dose of 100 Gy. Xiong [34] irradiated the samples from low doses as 0.1 -1 Gy up to 2000 Gy Holovey et al [41,42] who based his studies on different annealing conditions worked on a moderate dose of 1.7 Gy. In order to detect the existence of TL response a medium dose may be sufficient, for instance exposing lithium tetraborate doped with copper to 4.5 Gy radiations was found adequate [17].…”

Section: Tl Measurement Of Lithium Boratesmentioning

confidence: 99%

“…It was observed that TL peaks shifted towards higher temperature regions accompanied by a decrease in the intensity of the main peak with an increase in heating rate although the shapes of the glow curves did not display any change as a function of the heating rate. The other common heating rates employed for lithium tetraborate are 0.5 K/s [41][42][43] [17]. In all of the TL research made on lithium tetraborate the maximum temperature reached is around 400 o C since the main peak is expected around 200 o C.…”

Section: Tl Measurement Of Lithium Boratesmentioning

confidence: 99%

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An Overview on Preparation and TL Characterization of Lithium Borates for Dosimetric Use

Pekpak¹,

Yılmaz²,

Özbayoğlu³

2010

TOMPJ

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Boron that appears in borate form in nature is an essential additive to a variety of industrial products. Recently, certain boron compounds have attracted attention in high technology utilization areas owing to their special crystal and optical characteristics. Thermoluminescent (TL) dosimetry that is used to record amount of radiation exposure is one of such areas. Two borates searched for candidacy in TL dosimetry are lithium tetraborate and lithium triborate. These materials are synthesized and metal doped by numerous researchers to be tested for thermoluminescence response. Lithium tetraborate has aroused interest of scientists since 1960s by the courtesy of the thermoluminescence (TL) property. However, lithium triborate is rather new in this area. This study compromises a broad overview including synthesis methods employed for the production of these two materials. Furthermore, the TL properties that have significant effect on the TL dosimetry potential of a compound are noted along with the detailed information on TL measurement procedure specifications.Keywords: Thermoluminescence, dosimetry, lithium borates, synthesis, doping, characterization. BORATESThere are several natural and synthetic borates used in different branches of industry. Natural borates are generally cleaned from their impurities in processing plants and are further treated to more qualified end products (like boric acid, anhydrous boric acid, anhydrous borax, borax pentahydrate,borax decahydrate and sodium perborate) in recrystallizer units. Besides, the variability of borate crystal chemistry [1] allows researchers synthesize numerous borate structures usable in high technology areas. Thermoluminescent (TL) dosimetry used to measure radiation exposure is an important high technology utilization area for these synthetic borates. General Uses of Borates in High TechnologyIt is certain that the interesting crystal structure of borates play an important role for its utilization in high technology. Although the utilization variety of borates is strongly related to its structural variety, in this communication we will concentrate on results of these characteristics rather than chemical background. Indeed, there is extensive number of studies devoted to the crystal structures of borates [1][2][3] which may be refered for detailed information.Owing to the varied crystallinity borates possess large electronic band gaps, attractive nonlinear optical (NLO) properties, chemical and environmental stability, and mechanical strength [3]. Hence, they found wide use in *Address correspondence to this author at the Middle East Technical University, Mining Engineering, Ankara, Turkey; Tel: +903122102664; Fax: +903122105822; E-mails: epekpak@metu.edu.tr, ayseny@metu.edu.tr nonlinear optical technologies as well as in thermoluminescence dosimetry.Borates have high UV transmittance at wavelengths down to 155 nm [4]. Therefore, they are appropriate for the use in plasma displays and in laser technology. Furthermore they are strong phosphors which ...

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Section: Tl Measurement Of Lithium Boratesmentioning

confidence: 99%

Section: Tl Measurement Of Lithium Boratesmentioning

confidence: 99%

An Overview on Preparation and TL Characterization of Lithium Borates for Dosimetric Use

Pekpak¹,

Yılmaz²,

Özbayoğlu³

2010

TOMPJ

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“…The second group of TSL maxima (470-510 K), which is stable for a long period of time (several months or even years), is used in dosimetry. The TSL curve of Li 2 B 4 O 7 :Mn demonstrates no essential differences from previously reported cases, either for TL detectors [19] or for single crystals [18,28]. It is essential to note that the two groups of TSL maxima have different spectral composition of luminescence.…”

Section: Thermoluminescence and Its Spectral Compositionmentioning

confidence: 54%

“…The B2-O4 bond (Fig. 2a) is the weakest one in Li 2 B 4 O 7 [28] and has the most pronounced variations of the length with temperature [21]. If either Mn 3+ or Mn 2+ occurred at the position of B2, the tetrahedron size could be increased mostly on the account of a weak bond with the O4 atom.…”

Section: Materials Characterization and Features Of The Crystal Structurementioning

confidence: 99%

Li₂B₄O₇:Mn for dosimetry applications: traps and mechanisms

Ratas¹,

Danilkin²,

Kerikmäe³

et al. 2012

Proc. Estonian Acad. Sci.

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Thermoluminescence curves, kinetics, and Electron Paramagnetic Resonance (EPR) data were compared for Li 2 B 4 O 7 :Mn and Li 2 B 4 O 7 :Mn,Be radiation detectors. Analysis of the experimental data, both our own and published by other investigators, in connection with features of the crystal lattice structure allowed us to build models of traps and thermoluminescence mechanisms. The thermoluminescence peaks used in dosimetry are connected with the release of holes trapped at bridging oxygen near Mn 2+ (or Be 2+ ), substituting for tetrahedrally coordinated B 3+ . The luminescence occurs at Mn 2+ substituting for Li + . Two types of Mn 2+ centres give different luminescence and EPR spectra. The effects of Mn 2+ interaction with surrounding oxygen atoms are discussed both for the Mn 2+ luminescence band and for the hyperfine structure of EPR. Kinetics measurements revealed an additional "hopping" barrier for a hole to get to a recombination centre after it has been released from a trap. A simple kinetics model is suggested to describe the experimental data. The studies of optical stimulation spectra and optically stimulated emptying of traps demonstrated the possibility of using Li 2 B 4 O 7 :Mn and Li 2 B 4 O 7 :Mn,Be radiation detectors with optically stimulated readout systems.

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“…Park et al [13] compared the thermoluminescence and photoluminescence results of Cu, Mn and Mg doped LTB single crystals. LTB:Cu had a glow curve consisting of three peaks, one is at 125 • C, one is at 210 • C, and the other one is at about 260 • C. LTB:Mg gave a glow curve with only one peak at about 200 • C, although LTB:Mn gave a peak at about 250 • C. Holovey et al [14] focused on the thermoluminescent behaviors with different annealing conditions of LTB:Mn single crystals. Tiwari et al [15] studied the photoluminescence and thermoluminescence properties of single crystals of lithium tetraborate doped with Cu (0.5 wt%).…”

Section: Introductionmentioning

confidence: 99%

Effects of synthesis, doping methods and metal content on thermoluminescence glow curves of lithium tetraborate

Kayhan

Yılmaz

2011

Journal of Alloys and Compounds

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Influence of different annealing conditions on the luminescent properties of Li2B4O7:Mn single crystals

Cited by 20 publications

References 17 publications

An Overview on Preparation and TL Characterization of Lithium Borates for Dosimetric Use

An Overview on Preparation and TL Characterization of Lithium Borates for Dosimetric Use

Li₂B₄O₇:Mn for dosimetry applications: traps and mechanisms

Effects of synthesis, doping methods and metal content on thermoluminescence glow curves of lithium tetraborate

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Influence of different annealing conditions on the luminescent properties of Li2B4O7:Mn single crystals

Cited by 20 publications

References 17 publications

An Overview on Preparation and TL Characterization of Lithium Borates for Dosimetric Use

An Overview on Preparation and TL Characterization of Lithium Borates for Dosimetric Use

Li2B4O7:Mn for dosimetry applications: traps and mechanisms

Effects of synthesis, doping methods and metal content on thermoluminescence glow curves of lithium tetraborate

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Li₂B₄O₇:Mn for dosimetry applications: traps and mechanisms