Structural and electrical properties of nanostructured cerium phosphate

Designing and Synthesis of (Cd2+, Li+), Cr3+, Bi3+ Doped CePO4 Materials Optical, Electrochemical, Ionic Conductivity Analysis

“…The activation energy of the undoped CePO 4 nanorods (Ea = 1.08 eV) is comparable to that obtained for CePO 4 nanosheets (Ea = 1.06 eV) [44]. It seems that the change of the morphology and the synthesis route used weakly affect the activation energy of the cerium phosphates.…”

Transcription of Nanofibrous Cerium Phosphate Using a pH-Sensitive Lipodipeptide Hydrogel Template

“…It is well-known that cerium phosphate crystallizes at low temperatures as an hydrated hexagonal phase (hexagonal rhabdophane, CePO 4 ·xH 2 O, which usually contains one mol of hydration water, x = 1) [99,100], and that the evolution of water molecules to render anhydrous hexagonal CePO 4 phase needs of annealing treatments at 200 °C or even up to 600 °C [24,25,99]. Therefore, thermal analysis (WAXD) of reference (non-templated) and C12GA-templated CePO 4 was performed in order to determine the amount of hydration water present in 60 °C-dried samples, and also the temperature range for the removal (decomposition) of the self-assembled C12GA gelator scaffold in the case of templated CePO 4 .…”

“…Starting from the hydrated form of hexagonal CePO 4 ·xH 2 O (rhabdophane), it normally proceeds with its dehydration (at 110–400 °C) without any change of crystalline system and space group to render anhydrous hexagonal CePO 4 . Some authors state that a complete elimination of crystallization water may not been accomplished up to 600 °C, suggesting also that the presence of water molecules becomes indispensable for the stabilization of hexagonal CePO 4 ; thus, the phase transformation into the monoclinic form of CePO 4 (monazite) would occur after removal of these water molecules [25,101]. This transformation into monoclinic CePO 4 (monazite) normally occurs in the temperature range between 400 and 700 °C (usually around 600 °C), although formation of monoclinic monazite can be triggered at 200 °C under hydrothermal treatments [5,13,24,39,48,51].…”

“…Rare-earth phosphates (from now on, RPO 4 ) are being prolifically investigated during the last decades given the wide variety of interesting properties they may exhibit, such as optical, electronical (or optoelectronical), ion-exchange, catalytic, heat-resistance, and biocompatibility, among others. These advanced properties have enabled the application of RPO 4 , especially CePO 4 and related solid solutions (with Tb, Gd, or other lantanides) and composite systems (Au/CePO 4 ,...) in a plethora of technological applications, such as optoelectronic devices (luminescent materials, phosphors, displays, green light-emitting diodes or switches, solid-state lasers, redox sensors, non-linear optical devices,...) [1,2,3,4,5,6,7,8,9,10,11,12,13], fluorescent probes for chemical sensing [14,15,16] and detection or removal of heavy metals (e.g., Pb 2+ , Co 2+ ,...) [17,18], bio-sensing, bio-imaging and cell-labeling applications [19,20,21,22,23], ceramic materials (with high thermal and mechanical properties) [24], dielectrics [25], catalysts [26,27,28,29,30], ion-exchange or ion-conducting materials (proton-conducting membranes) for solid-oxide fuel cells (SOFCs) [25,31] and solar-cells, ceramic pigments [32,33,34], UV filters for sunscreens [35], and so on.…”

Complex Impedance and Modulus Analysis on Porous and Non-Porous Scaffold Composites Due to Effect of Hydroxyapatite/Starch Proportion

“…Complex modulus focuses on the electrical transport phenomena and small capacitance [ 4 , 13 , 14 ]. The variations of grain, grain boundary, interface, porosity, material proportion, and filler dispersion in the porous composites can be reflected in the complex modulus and complex impedance responses [ 4 , 10 , 12 , 15 , 16 ]. Many studies examined the electrical performances (complex modulus and complex impedance) of inorganic/organic composites for a variety of applications [ 1 , 4 , 13 , 17 , 18 ].…”