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

Colomer, M.T.; Mosa, Jadra

doi:10.1016/j.ceramint.2015.03.006

Cited by 19 publications

(9 citation statements)

References 45 publications

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“…Specifically, there is a first weight loss in the temperature range ~25-170 °C, which corresponds to the desorption of physisorbed water as a consequence of an incomplete drying of the powders. This is followed by a second weight loss extending up to ~200 °C, accompanied by an endothermic event, which is associated with the elimination of chemisorbed water, that is, to the dehydration of the hexagonal, hydrated La1-xTbxPO4•nH2O phase; 15,39 this is consistent with the XRTD analyses. Next there is a third weight loss with an exothermic peak at ~375 °C which is attributable to the removal of residual acetates from the precursors.…”

Section: Ftir and Dta-tg Characterizationsupporting

confidence: 81%

Effect of Tb3+ doping and self-generated pressure on the crystallographic/morphological features and thermal stability of LaPO4·nH2O single-crystal nanorods obtained by microwave-assisted hydrothermal synthesis

Colomer

Ortiz

2016

Ceramics International

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The effect of Tb 3+-doping content (in the range 0-20 mol.%) and autogeneous/selfgenerated pressure (in the range 2.3-3.40.1 bar) on the crystallographic/morphological features and thermal stability of single-crystal nanorods of LaPO4•nH2O obtained by a simple and fast microwave-assisted hydrothermal synthesis was investigated. It is shown that highquality (that is, well-shaped and linear/planar defect free) rhabdophane-type single-crystal La1-xTbxPO4•nH2O (x=0-0.20) nanorods, with a high morphological uniformity, are obtained in all cases. In addition, it is shown that the Tb 3+ solutes are incorporated into the LaPO4•nH2O host, forming substitutional solid solutions (i.e., partial substitution of La 3+ by Tb 3+) with progressively smaller unit-cell volume but with identical thermal stability. Morphologically Tb 3+ doping however results in the formation of nanorods with lower aspect ratio, and in particular in nanorods that are much shorter but essentially equally thick. With respect to the self-generated pressure during the microwave synthesis, it is shown that its increase does not affect to crystallographic aspects, but however results again in nanorods with lower aspect ratio. It is also demonstrated that monazite-type single-crystal La1-xTbxPO4 nanorods can be obtained by calcining their rhabdophane-type La1-xTbxPO4•nH2O counterparts at ~700 ºC in air, with a higher Tb 3+-doping content and self-generated pressure leading as well to lower aspect-ratio calcined nanorods. Consequently, in the present study important guidelines have been identified for the controlled synthesis of functional La1-xTbxPO4•nH2O nanorods with tailored morphology.

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Section: Ftir and Dta-tg Characterizationsupporting

confidence: 81%

Effect of Tb3+ doping and self-generated pressure on the crystallographic/morphological features and thermal stability of LaPO4·nH2O single-crystal nanorods obtained by microwave-assisted hydrothermal synthesis

Colomer

Ortiz

2016

Ceramics International

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“…Rare earth metal phosphates with various sizes and shapes can be prepared by controlling various synthesis parameters such as pH of the reactants, types of precursors, synthesis methods, reaction time, pressure, etc. Following these variables, several shapes such as plates, rods, twin, spheres, cubes, rectangular prism [10][11][12][13][14][15][16], with hexagonal/monoclinic phase have been reported in the literature.…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic and magnetic properties of neodymium doped in GdPO4 sub-micron-stars prepared by solvothermal method

Kumar

Balli

Kailasnath

et al. 2016

Journal of Alloys and Compounds

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Neodymium-doped gadolinium orthophosphate (GdPO 4 :Nd 3+) luminomagnetic sub-micron-stars were prepared by solvothermal method using metal nitrates and phosphoric acid. Monoclinic star shaped in six lobed sub-micron-stars with 600 nm length is obtained with uniform particle size distribution. After heat-treatment at 800°C for 1 hour in air, the stars separate into isolated petal shaped particles and show characteristic emission bands of Nd 3+ with the strongest emission at 1064 nm. The emission intensities and fluorescence decay times are dependent on the Nd 3+ concentration with the highest emission intensity and longest fluorescence decay time of 311 µs at 1064 nm with 0.5 mol% Nd 3+. Under 808 nm excitation with 12 W/cm 2 power density a quantum yield of 9% was obtained for the 1.0 mol% Nd 3+. The presence of paramagnetic Gd 3+ givesmagnetic properties to the phosphorwith a calculated magnetic moment of 1,510 and 107,965 Bohr magneton at 300 and 5 K, respectively.

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“…The XRD pattern for powder samples calcined at 1200°C is similar to that of 1000°C. According to Figure 1(b), after calcination at 1500°C, the phase of La(PO 3 ) 3 disappears [19,22]:…”

Section: Phases and Morphologies Of Lanthanum Phosphate Powdersmentioning

confidence: 97%

Mechanical and dielectric properties of porous lanthanum orthophosphate materials with TiO₂ addition via foam-gelcasting

Qiao

Liu

2020

Journal of Asian Ceramic Societies

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Lanthanum orthophosphate (LaPO 4 ) powder was prepared by a solid-liquid precipitation reaction of lanthanum carbonate powder with H 3 PO 4 in order to fabricate porous LaPO 4 materials. The phase transition and morphology evolution of the reaction products were found to be dependent mainly on the mass ratios of reactants and calcination temperatures. Porous materials using as-synthesized single-phase LaPO 4 powders and TiO 2 additives via direct foam-gelcasting exhibit large spherical-shaped cells without preferred orientation. The bulk density increases with the increase of sintering temperatures, as evidenced by bigger strut thickness, smaller cell and window sizes and lower inter-connectivity. Porous LaPO 4 bulk ceramic with 5 wt% TiO 2 addition sintered from 1100°C to 1500°C shows a porosity within 66.80-82.03% and a compressive strength from 4.0 to 17.2 MPa. The compressive strength dependence on the relative density follows a power-law relationship with an exponent value of 2.45. While imaginary parts of dielectric permittivity of the porous LaPO 4 materials measured over the X-band frequencies (8.2-12.4 GHz) depend weakly on the frequency and TiO 2 addition, the real parts are affected strongly by TiO 2 addition and sintering temperatures and fall within the range between 1.9 and 3.5 in this study. ARTICLE HISTORY

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

Cited by 19 publications

References 45 publications

Effect of Tb3+ doping and self-generated pressure on the crystallographic/morphological features and thermal stability of LaPO4·nH2O single-crystal nanorods obtained by microwave-assisted hydrothermal synthesis

Effect of Tb3+ doping and self-generated pressure on the crystallographic/morphological features and thermal stability of LaPO4·nH2O single-crystal nanorods obtained by microwave-assisted hydrothermal synthesis

Spectroscopic and magnetic properties of neodymium doped in GdPO4 sub-micron-stars prepared by solvothermal method

Mechanical and dielectric properties of porous lanthanum orthophosphate materials with TiO₂ addition via foam-gelcasting

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

Cited by 19 publications

References 45 publications

Effect of Tb3+ doping and self-generated pressure on the crystallographic/morphological features and thermal stability of LaPO4·nH2O single-crystal nanorods obtained by microwave-assisted hydrothermal synthesis

Effect of Tb3+ doping and self-generated pressure on the crystallographic/morphological features and thermal stability of LaPO4·nH2O single-crystal nanorods obtained by microwave-assisted hydrothermal synthesis

Spectroscopic and magnetic properties of neodymium doped in GdPO4 sub-micron-stars prepared by solvothermal method

Mechanical and dielectric properties of porous lanthanum orthophosphate materials with TiO2 addition via foam-gelcasting

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Mechanical and dielectric properties of porous lanthanum orthophosphate materials with TiO₂ addition via foam-gelcasting