Synthesis and characterization of LaPO4 powder heat treated at various temperatures

Zheng, Qiuju; Wang, Xin; Tian, Jing; Kang, Rui; Yin, Yansheng

doi:10.1016/j.matchemphys.2010.03.002

Cited by 23 publications

(14 citation statements)

References 26 publications

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“…The XRD patterns of lanthanum phosphate powders calcined at 1500°C with various mass ratios of H 3 PO 4 are shown in Figure 1. The monoclinic LaPO 4 (JCPDS # 32-0493) [6] is the dominant phase in all sample powders, while traces of La 3 PO 7 (JCPDS # 49-1023) [19] for a mass ratio of 10:10:3 and La(PO 3 ) 3 (JCPDS file # 33-0718) [20] for 10:10:5 and 10:10:6 are also observed. Relatively pure monoclinic LaPO 4 phase was obtained only for a mass ratio of 10:10:4 ( Figure 1(b)), so powder under this processing condition was used subsequently.…”

Section: Phases and Morphologies Of Lanthanum Phosphate Powdersmentioning

confidence: 87%

“…Figure 2 illustrates the XRD patterns of the as-synthesized white precipitate calcined at various temperatures. The broad peaks demonstrate an incomplete crystallization of the hexagonal phase LaPO 4 ·0.5H 2 O (JCPDS #46-1439) [6] dried at 150°C because of the following reaction:…”

Section: Phases and Morphologies Of Lanthanum Phosphate Powdersmentioning

confidence: 99%

“…The LaPO 4 powder can be synthesized by the solidliquid precipitation [3,4] or solvothermal reaction [5] using H 3 PO 4 and La 2 O 3 or La(NO 3 ) 3 as the raw materials. The phase transformation and morphology of the final products were influenced by calcination temperatures, synthesis methods, processing conditions and types of raw materials [6,7]. The porous lanthanum orthophosphate materials have been fabricated by template and sol-gel routes so far [8,9].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Phases and Morphologies Of Lanthanum Phosphate Powdersmentioning

confidence: 87%

Section: Phases and Morphologies Of Lanthanum Phosphate Powdersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…As shown in the figure, the lanthanide precipitates were a mixture of a monoclinic structure, usually represented as a polyhedron structure, and a tetragonal structure, represented as a platelet structure. Several researchers have reported that the morphologies of LnPO 4 are distinguished by polyhedral, quasirod, rod, platelet and wire structures [11][12][13][14]. A typical energy dispersive spectroscopy (EDS) result of the precipitate is shown in Figure 8(B).…”

Section: Characteristics Of Lanthanide Phosphatementioning

confidence: 99%

Study on the phosphate reaction characteristics of lanthanide chlorides in molten salt with operating conditions

Lee¹,

Cho²,

Eun³

et al. 2013

Journal of Nuclear Science and Technology

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A minimization of waste salt is one of the most important issues for the optimization of pyroprocessing. The separation of fission products in waste salts and the reuse of purified waste salt are promising strategies for minimizing the waste salt amounts. The phosphate precipitation of lanthanide is currently being considered for eutectic (LiCl-KCl) waste salt purification. In this research, the effects of molten salt temperature (400-550• C) and reaction time (max. 180 min) upon conversion into the phosphate of lanthanides was investigated using 1 and 3 kg of eutectic salt. The conversion efficiency of lanthanides to molten salt-insoluble precipitates and phosphates was increased with an increase in molten salt temperature and operating time until it attained a specific temperature and time. K 3 PO 4 as a precipitant was more favorable than Li 3 PO 4 in terms of reactivity. To obtain over a 99% overall conversion efficiency, about 30 min was required in the case of using K 3 PO 4 at 450• C, but about 120 min in the case of using Li 3 PO 4 at 550• C. The lanthanide precipitates formed by a reaction with phosphate were a mixture of monoclinic structures, usually representing a polyhedron structure, and a tetragonal structure, representing a platelet structure.

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“…Doped with other rareearth elements, bulk LaPO 4 products were commercially applied in lamp phosphors [2], high-temperature proton conductors [3] and biolabeling materials [4]. Due to different starting materials, synthesis methods and technological parameters, the resultants present a variety of morphologies, such as fiber [5], rodlike [6], sphere [7], flowerlike [8] and nanotube [9]. The diversity of microstructures leads to difference in optical and electronic properties accordingly.…”

Section: Introductionmentioning

confidence: 99%

Effects of pH value on growth morphology of LaPO4 nanocrystals: investigated from experiment and theoretical calculations

et al. 2016

Self Cite

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The morphologies of the materials have strong effects on their performance in particular applications. In our experiment, we synthesized LaPO 4 successfully by the typical hydrothermal method in acidic conditions. The morphologies, preferred orientation and crystal facets are characterized by scanning electron microscopy, selected-area electron diffraction and high-resolution transmission electron microscopy. Combining the experimental findings, the surface energies of two major surfaces, (110) and (031) planes, were calculated using density functional theory methods. The theoretical calculations on the slabs surface energies were performed to simulate the shape of nanoparticles by the Wulff construction. The experimental results indicate that LaPO 4 prepared in this work shows rodlike structure. The equilibrium shape of clava with large length-diameter ratio is achieved. With increasing hydrogen ion concentration in solutions, the morphologies present as sticks and their length-diameter ratios tend bigger, which is consistent with experimental results to a great extent.

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Synthesis and characterization of LaPO4 powder heat treated at various temperatures

Cited by 23 publications

References 26 publications

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

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

Study on the phosphate reaction characteristics of lanthanide chlorides in molten salt with operating conditions

Effects of pH value on growth morphology of LaPO4 nanocrystals: investigated from experiment and theoretical calculations

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Synthesis and characterization of LaPO4 powder heat treated at various temperatures

Cited by 23 publications

References 26 publications

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

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

Study on the phosphate reaction characteristics of lanthanide chlorides in molten salt with operating conditions

Effects of pH value on growth morphology of LaPO4 nanocrystals: investigated from experiment and theoretical calculations

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

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