TY - JOUR
T1 - Effect of the chemical impurities on the luminescence emission of natural apatites
AU - Roman-Lopez, J.
AU - Correcher, V.
AU - Garcia-Guinea, J.
AU - Prado-Herrero, P.
AU - Rivera, T.
AU - Lozano, I. B.
N1 - Funding Information:
We acknowledge the financial support of projects CICYT CGL2010-17108 of the Spanish Plan Nacional I+D+I, CICATA-IPN, CONACyT-Mexico and PIFI-IPN project No. 20120758. Thanks are also given to Mr. Harffy for the critical review of the paper.
PY - 2014/5/21
Y1 - 2014/5/21
N2 - This paper reports on both cathodoluminescence (CL) and blue thermoluminescence (TL) emission of well-characterized natural Spanish and Brazilian apatites [Ca5(PO4)3(OH, F, Cl)]. Chemical analyses performed by means of Electron Microprobe Analysis (EMPA) have shown the presence of trace elements that can induce CL bands. In this sense, the apatites shown emission bands peaked at 3.26, 2.86, 2.62, 2.14, 2.02 and 1.94 eV are respectively linked to substitutional Ce3+, Tb 3+, Dy3+, Pr3+, Sm3+ and Mn 2+ in structural Ca2+ positions. The 3.18 eV emission band can be associated with intrinsic electron defects on oxygen of the phosphate group (PO4)3-. The presence of (UO2) 2+ gives rise to an emission at 2.14 eV. All the studied aliquots exhibit one single UV-blue TL peak that modifies the position from one sample to another (370, 256 and 268 C) probably due to (i) the variation in the crystallinity index (from 0.88 to 1.34) and (ii) successive chemical processes such as oxidation, dehydration, dehydroxylation, and fluorine ions losses due to the thermal readout.
AB - This paper reports on both cathodoluminescence (CL) and blue thermoluminescence (TL) emission of well-characterized natural Spanish and Brazilian apatites [Ca5(PO4)3(OH, F, Cl)]. Chemical analyses performed by means of Electron Microprobe Analysis (EMPA) have shown the presence of trace elements that can induce CL bands. In this sense, the apatites shown emission bands peaked at 3.26, 2.86, 2.62, 2.14, 2.02 and 1.94 eV are respectively linked to substitutional Ce3+, Tb 3+, Dy3+, Pr3+, Sm3+ and Mn 2+ in structural Ca2+ positions. The 3.18 eV emission band can be associated with intrinsic electron defects on oxygen of the phosphate group (PO4)3-. The presence of (UO2) 2+ gives rise to an emission at 2.14 eV. All the studied aliquots exhibit one single UV-blue TL peak that modifies the position from one sample to another (370, 256 and 268 C) probably due to (i) the variation in the crystallinity index (from 0.88 to 1.34) and (ii) successive chemical processes such as oxidation, dehydration, dehydroxylation, and fluorine ions losses due to the thermal readout.
KW - Blue-thermoluminescence
KW - Cathodoluminescence
KW - Crystallinity index
KW - Natural apatite
UR - http://www.scopus.com/inward/record.url?scp=84897683312&partnerID=8YFLogxK
U2 - 10.1016/j.saa.2014.01.128
DO - 10.1016/j.saa.2014.01.128
M3 - Artículo
C2 - 24594886
SN - 1386-1425
VL - 126
SP - 142
EP - 147
JO - Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
JF - Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
ER -