Combustion synthesis and luminescence properties of LaPO4: Eu (5%)

Thermal evolution, second phases, and sintering behavior of LaPO4·nH2O nanorods prepared by two different chemical synthesis routes

“…In addition, the carbon content analysis also confirms the presence of this element in the uncalcined powders (1.0 wt%) and no presence of carbon for the calcined powders at 800 1C. Furthermore, the FTIR spectrum for the asprepared and dried powders presents two peaks at 781 and 1264 cm À 1 which can be assigned to trioxophosphate groups (PO 3 1À ) related to La(PO 3 ) 3 , as was mentioned above [25][26][27]29]. Two bands at 1380 and 1468 cm À 1 are observed which are both characteristic of the N-O bond in the NO 3 À group in nitrates, as it was mentioned above.…”

“…In fact, the N analysis indicates that there is a decrease in the nitrogen content of the as-prepared nanopowder when the powder is calcined; being the nitrogen amount 10.0 wt% for the as-prepared powder, and for the calcined powder, at 800 1C for 12 h, the content is below the experimental error. In addition, the FTIR spectrum of the as-prepared and dried powders presents one peak at 810 cm À 1 which can be assigned to trioxophosphate groups (PO 3 1À ) related to La(PO 3 ) 3 [25]. That band has been also found by other authors and also assigned to the trioxophosphate group [26,27].…”

Luminescence Properties of Redispersible Tb3+‐Doped GdPO4 Nanoparticles Prepared by an Ethylene Glycol Route

“…[23,24] The stretching vibrations of (PO 4 ) 3-, which are referred to as the ν 3 region, have been assigned at 885, 946, and 1070 cm -1 . [23,24] In previous studies on LnPO 4 (Ln = Gd, Y, La), [24][25][26][27][28][29] similar peaks were reported. Peaks at 1662 and 3310 cm -1 correspond to bending and stretching vibrations, respectively, for the O-H group of the ethylene glycol molecule, which is used as a capping agent for nanoparticles.…”

“…[27,[29][30][31][32] However, free O-H has a stretching frequency at 3650 cm -1 . [23] The broad band at 3310 cm -1 therefore indicates the presence of a hydrogen bond in ethylene glycol molecules. Water associated with GdPO 4 could not be distinguished because the O-H peaks due to water have been merged with those of ethylene glycol.…”

Thermoluminescent properties of Dy doped calcium borate based glass for dose measurement subjected to photon irradiation

“…As reported elsewhere, the luminescence spectra and the glow peak in TLDs arise mainly from the signal in the doped core [21]. Rare earth elements as dopant in silica materials have gained much interest of many researchers as a result of 4f electronic configuration of rare earth in various glass matrixes and therefore leads to emission of ultraviolet and infrared [9], a matter which can be used to great benefit of radiation dosimetry system. The work presented herein makes use of the TL signal stored in rare earth based Dy2O3 as dopant in the calcium borate glass subjected to ionising radiation, offering an excellent TL yield and dose sensitivity [10].…”