Synthesis of rare-earth doped lithium triborate

Download

index.pdf

Date

2005

Author

Ardıçoğlu, Burcu

Metadata

Show full item record

Item Usage Stats

254
views

125
downloads

Research in the field of non-linear optical (NLO) devices lead to an increasing interest in new borate compounds, capable of expanding the frequency range provided by common laser sources. Lithium triborate (LBO) is a newly developed ideal non-linear optical crystal used in laser weapon, welder, radar, tracker, surgery, communication, etc. Borates containing rare-earth elements are of great interest since they are found to be superior in non-linear optical applications. In this study, synthesis and identification of rare-earth doped lithium triborate was carried out. Lithium triborate was produced from the solid-state reaction. LBO was then doped with some rare-earth elements (Gd, La, Y) in several different concentrations. Appropriate quantities of Li2CO3 and H3BO3, weighted separately, were mixed and finely powdered. Then, the mixture was heated at 750 ðC for 14 hrs. The expected reaction is given below. Li2CO3 + 6H3BO3 --> 2LiB3O5 + CO2 + 9H2O Prepared LiB3O5 and Gd2O3, La2O3 and Y2O3 samples were weighed separately at different concentrations and ground together. The mixture was then heated at 750 ðC for 7 hrs. Characterization of the new products was done by X-Ray Diffraction (XRD) and Infrared (IR) analysis. Differential Thermal Analysis (DTA) was used for examination of the thermal properties of the compounds, morphology of new compounds was observed by Scanning Electron Microscopy (SEM). The compounds are then subjected to thermoluminescence (TL) studies. From the XRD studies, no change in the LBO phase related to the addition of rareearth elements was observed. However, peaks of those elements were also become apparent. IR analysis showed that there is no change related to B-O link with the addition of rare earth elements. DTA studies showed that the melting point of LBO decreases with the addition of rare earth elements. In the SEM images, two phases

Subject Keywords

Mining engineering.

URI

http://etd.lib.metu.edu.tr/upload/3/12606354/index.pdf
https://hdl.handle.net/11511/15496

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Production and identification of rare-earth doped lithium triborate Yılmaz, Ayşen; Ozdemir, Zeynep; Yılmaz, Aysun (2006-07-20) Research in the field of non-linear optical (NLO) devices lead to an increasing interest in new borate compounds, capable of expanding the frequency range provided by common laser sources. Lithium triborate (LBO) is a newly developed ideal non-linear optical crystal used in laser weapon, welder, radar, tracker, surgery, communication, etc. In this study, synthesis and identification of rare-earth doped lithium triborate was carried out. Borates containing rare-earth elements are of great interest since they...
Modification of magnetic properties of siderite by thermal treatment Alkaç, Dilek; Atalay, M Ümit; Department of Mining Engineering (2007) Obtaining high magnetic susceptibility phases from HekimhanDeveci siderite orevia preliminary thermal treatment has been the basic target of the thesis study.Thermal decomposition characteristics of samples, determined bythermogravimetric analysis (TGA), differential thermal analysis (DTA), and differential scanning calorimetry (DSC), were referenced in advancement of thestudy. Heat treatment experiments, particularly roasting, were carried out byconventional heating and microwave heating. Results showed th...
Synthesis, characterization and investigation of thermoluinescence properties of strontium pyrophosphate doped with metals İlkay, Levent Sait; Özbayoğlu, Gülhan; Department of Mining Engineering (2009) Strontium pyrophosphate is a promising phosphate that is used widely in the industry as a result of its luminescent, fluorescent, dielectric, semi-conductor, catalyst, magnetic and ion exchange properties. Thermoluminescent dosimetry (TLD) is one of such areas. Recent researches in METU on thermoluminescence property of strontium pyrophosphate showed that strontium pyrophosphate could give enough intensity for radiation dosimetry when doped with oxides of some rare-earth elements. In this study strontium py...
An effective surface design based on a conjugated polymer and silver nanowires for the detection of paraoxon in tap water and milk Turan, Janset; Kesik, Melis; SÖYLEMEZ, SANİYE; Goker, Seza; Coskun, Sahin; Ünalan, Hüsnü Emrah; Toppare, Levent Kamil (2016-06-02) In this study, a novel approach for the fabrication of a biosensor utilizing a conducting polymer and silver nanowires is reported. To obtain immobilization platform for butyrylcholinesterase (BChE), a graphite electrode was modified with the poly(5,6-bis(octyloxy)-4,7-di(thieno[3][3,2-b]thiophen-2yl)benzo[c][1,2,5]oxoadiazole) (PTTBO) which has a hydrophobic alkyl chain as the pendant group providing hydrophobic nature to the matrix. Since biomolecules contain both hydrophobic and hydrophilic parts in thei...
Synthesis and characterization of lithium triborate by different synthesis methods and their thermoluminescent properties Depci, Tolga; Özbayoğlu, Gülhan; Department of Mining Engineering (2009) Lithium triborate, (LiB3O5), is a technologically important material for diverse applications, such as nonlinear optical materials and surface acoustic wave devices or, etc. Furthermore, it is suggested as an efficient thermoluminescent material. LiB3O5, suitable to dosimetric usage, was produced by different synthesis methods which were high temperature solid state reaction, microwave solid state reaction, microwave assisted high temperature solid state reaction and precipitation assisted high temperature ...

Citation Formats

B. Ardıçoğlu, “Synthesis of rare-earth doped lithium triborate,” M.S. - Master of Science, Middle East Technical University, 2005.