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Title: Ba{sub 3}BP{sub 3}O{sub 12}:Eu{sup 2+}--A potential scintillation material

Abstract

The sample of Eu{sup 2+}-doped Ba{sub 3}BP{sub 3}O{sub 12} was prepared by a solid-state reaction at high temperature and was showed to be an excellent scintillator when excited with hard x ray s. The phosphor showed a broad emission band in the wavelength range of 400-650 nm and a comparable light yield with that of Bi{sub 4}Ge{sub 3}O{sub 12} powders. Its room temperature fluorescence decay curve exhibited a two-exponent shape with decay time of 20.0{+-}1.4 ns (98.97%) and 522{+-}9 ns (1.03%), respectively. Considering the suitable emission wavelength range, large light yield, short decay time, moderate density, moderately low melting point, and nonhygroscopic property of Ba{sub 3}BP{sub 3}O{sub 12}:Eu{sup 2+}, one has reason to assume that this compound might find an application as a new scintillation material.

Authors:
; ; ; ; ;  [1]
  1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050 (China)
Publication Date:
OSTI Identifier:
20706421
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 87; Journal Issue: 20; Other Information: DOI: 10.1063/1.2130728; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BARIUM PHOSPHATES; BISMUTH GERMANATES; BORON PHOSPHATES; DOPED MATERIALS; EUROPIUM IONS; FLUORESCENCE; HARD X RADIATION; MELTING POINTS; PHOSPHORS; POWDERS; SCINTILLATIONS; TEMPERATURE RANGE 0273-0400 K; VISIBLE RADIATION

Citation Formats

Duan Chengjun, Wu Xueyan, Li Weifeng, Chen Haohong, Feng Xiqi, and Zhao Jingtai. Ba{sub 3}BP{sub 3}O{sub 12}:Eu{sup 2+}--A potential scintillation material. United States: N. p., 2005. Web. doi:10.1063/1.2130728.
Duan Chengjun, Wu Xueyan, Li Weifeng, Chen Haohong, Feng Xiqi, & Zhao Jingtai. Ba{sub 3}BP{sub 3}O{sub 12}:Eu{sup 2+}--A potential scintillation material. United States. doi:10.1063/1.2130728.
Duan Chengjun, Wu Xueyan, Li Weifeng, Chen Haohong, Feng Xiqi, and Zhao Jingtai. Mon . "Ba{sub 3}BP{sub 3}O{sub 12}:Eu{sup 2+}--A potential scintillation material". United States. doi:10.1063/1.2130728.
@article{osti_20706421,
title = {Ba{sub 3}BP{sub 3}O{sub 12}:Eu{sup 2+}--A potential scintillation material},
author = {Duan Chengjun and Wu Xueyan and Li Weifeng and Chen Haohong and Feng Xiqi and Zhao Jingtai},
abstractNote = {The sample of Eu{sup 2+}-doped Ba{sub 3}BP{sub 3}O{sub 12} was prepared by a solid-state reaction at high temperature and was showed to be an excellent scintillator when excited with hard x ray s. The phosphor showed a broad emission band in the wavelength range of 400-650 nm and a comparable light yield with that of Bi{sub 4}Ge{sub 3}O{sub 12} powders. Its room temperature fluorescence decay curve exhibited a two-exponent shape with decay time of 20.0{+-}1.4 ns (98.97%) and 522{+-}9 ns (1.03%), respectively. Considering the suitable emission wavelength range, large light yield, short decay time, moderate density, moderately low melting point, and nonhygroscopic property of Ba{sub 3}BP{sub 3}O{sub 12}:Eu{sup 2+}, one has reason to assume that this compound might find an application as a new scintillation material.},
doi = {10.1063/1.2130728},
journal = {Applied Physics Letters},
number = 20,
volume = 87,
place = {United States},
year = {Mon Nov 14 00:00:00 EST 2005},
month = {Mon Nov 14 00:00:00 EST 2005}
}
  • Highlights: • Eu{sup 2+}-activated Ba{sub 3}BP{sub 3}O{sub 12} single crystals have been grown by the top-seeded solution growth method (TSSG) for the first time. • Ba{sub 3}BP{sub 3}O{sub 12}:Eu{sup 2+} single crystal exhibits wide transparency in the wavelength range from 250 to 700 nm. • Ba{sub 3}BP{sub 3}O{sub 12}:Eu{sup 2+} single crystal shows high overall scintillation efficiency (1.8 times of BGO) and moderate decay time (860 ns). - Abstract: Single crystals of Ba{sub 3}BP{sub 3}O{sub 12}:Eu{sup 2+} with high optical quality have been grown by the top-seeded solution growth (TSSG) method using BPO{sub 4}–NaF mixture as the flux. Ba{sub 3}BP{submore » 3}O{sub 12}:Eu{sup 2+} single crystal exhibits wide transparency in the wavelength range from 250 to 700 nm, and shows a broad emission band in the wavelength range of 350–650 nm when excited by X-ray radiation. The overall scintillation efficiency is about 1.8 times of that of BGO crystal under the same conditions. Its room temperature fluorescence decay curve exhibits a single-exponent shape with decay time of about 860 ns. It is worth noting that Ba{sub 3}BP{sub 3}O{sub 12}:Eu{sup 2+} single crystal may be of great interest for applications in the field of scintillation materials considering its scintillation properties, as well as the good chemical stability.« less
  • The authors have investigated the mechanism and determined the enthalpy of crystallization of x-ray amorphous iron garnets of rare-earth elements and their solid solutions. The authors have established a relation between the mechanism of the solid-phase reaction of formation of the iron garnets and the decrease in the ionic radius of the rare-earth element in the dodecahedral positions. A rise in the temperature during crystallization of amorphous phases facilitates a rapid completion of the reaction in which double oxides with a complex three-sublattice structure are released.
  • Raman-scattering spectra of (Eu{sub 2/3}Ce{sub 1/3}){sub 2}(Ba{sub 2/3}Eu{sub 1/3}){sub 2}Cu{sub 3}O{sub 9} and (Er{sub 2/3}Ce{sub 1/3}){sub 2}(Ba{sub 2/3}La{sub 1/3}){sub 2}Cu{sub 3}O{sub 9}, both of which have Cu-O{sub 5} pyramid structure, as well as YBa{sub 2}Cu{sub 3}O{sub 7}, have been observed at room temperature with use of single crystals. A scattering peak with {ital B}{sub 1{ital g}} symmetry has been observed at around 180 cm{sup {minus}1} and peaks with {ital A}{sub 1{ital g}} symmetry at around 220, 290, 450, and 540 cm{sup {minus}1}, in both compounds. The 180-cm{sup {minus}1} peak with {ital B}{sub 1{ital g}} symmetry is assigned to the out-of-phasemore » bending of oxygen in the Cu-O{sub 2} plane and the 540-cm{sup {minus}1} peak with {ital A}{sub 1{ital g}} symmetry to the stretching of apical oxygen. Phonon-energy calculation has been performed with use of ionic potentials obtained for YBa{sub 2}Cu{sub 3}O{sub 7}. To explain the observed {ital B}{sub 1{ital g}} phonon energies, it has been found that the polarizability of the oxygen in the Cu-O{sub 2} plane in these compounds must be increased in relation to that in YBa{sub 2}Cu{sub 3}O{sub 7}. The 220- and 290-cm{sup {minus}1} peaks are tentatively assigned to the mixed vibrational modes of oxygens in the Cu-O{sub 2} plane and lanthanide atoms.« less
  • Complex alkoxides are promising precursors for the preparation of fine ceramic powders, thin-layer devices, and fibers. Hydrolysis and condensation of alkoxides result in the formation of oligomeric structures in solution and in the eventual formation of a gel. The formation of heterometallic species can lead to chemical homogeneity at the molecular level. Although there are numerous examples of bimetallic alkoxides in the literature, less is known regarding the structure of partial hydrolysis products. A better understanding of the sol-gel processing of ceramics could result from a study of hydrolysis and polycondensation reactions in complex alkoxides. The investigation described herein hasmore » as its objective the study of the synthesis and hydrolysis of heterometallic alkoxide precursors for barium titanate ceramics. For example, BaTiO[sub 3] is used in high dielectric constant capacitor materials, and Ba[sub 4]Ti[sub 13]O[sub 30], in high-frequency resonators.« less
  • This paper reports, in the system SrO- Al{sub 2}O{sub 3} a new compound discovered with composition 2SrO {center dot} 2AL{sub 2}O{sub 3} (SAL); its structure is related to the one of 4SrO {center dot} 7Al{sub 2}O{sub 3} (SAE). The aluminate 1.29 (Ba,Ca)O,6Al{sub 2}O{sub 3} (BAL) belongs to the {beta}-alumina type compounds and is closely related to BaMgAl{sub 10}O{sub 17} (BAM). The compounds SAL and BAL are good host lattices for highly efficient EU{sup 2 +} luminescence. The europium emission peaks at 460 nm in SAL and at 440 nm in BAL. Both phosphors show a high output and good maintenancemore » in low pressure Hg discharge lamps and are ideally suited for use in tricolor lamps.« less