Les systemes binaires AlPO4−M3PO4 (M=Li, Na, K)

Saïdi, Mohamed; Coffy, G.; Sibieude, F.

doi:10.1007/bf02547129

Cited by 5 publications

(4 citation statements)

References 6 publications

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“…The existing data for the compounds of the series Na 3(1 -x) Al x 2x PO 4 ( is cationic vacancy) differ con siderably from those we observe in our XRD patterns. Sodium orthophosphate Na 3 PO 4 has tetragonal (low [5][6][7]. The cubic lattice with Fd3m symmetry is stabilized by the addition of Al 3+ ions in the amount of x ≥ 0.1 [6,7]; and, according to [8], up to x = 0.43.…”

Section: Resultsmentioning

confidence: 99%

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Phase composition and structure of molybdenum-, copper-, and cesium-containing sodium aluminophosphate glassy materials for immobilization of high level wastes of nuclear reactors

Remizov¹,

Belanova²,

Stefanovsky

et al. 2014

Glass Phys Chem

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Molybdenum , copper , and cesium containing glass based on aluminophosphate designed to immobilize high active wastes (HAWs), which are formed at the reprocessing of spent nuclear fuel (SNF) from Atom Peaceful Big (AMB) nuclear reactor, have been synthesized and studied by means of the X ray diffraction and electron microscopy methods. After quenching the melts, glass, which partially crystallizes at annealing, is formed. The introduction of magnesium oxide in aluminophosphate glass increases its crystallization resistance; and molybdenum oxide, decreases. The samples crystallize after heat treatment with the formation of aluminum and sodium aluminum orthophosphates and solid solution of the (Na,Cs) 3-3x Al x PO 4 composition.

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Section: Resultsmentioning

confidence: 99%

“…Sodium orthophosphate Na 3 PO 4 has tetragonal (low [5][6][7]. The cubic lattice with Fd3m symmetry is stabilized by the addition of Al 3+ ions in the amount of x ≥ 0.1 [6,7]; and, according to [8], up to x = 0.43. With the subse quent increase in the content of the Al 3+ ions, the sym metry of the lattice decreases.…”

Section: Resultsmentioning

confidence: 99%

Phase composition and structure of molybdenum-, copper-, and cesium-containing sodium aluminophosphate glassy materials for immobilization of high level wastes of nuclear reactors

Remizov¹,

Belanova²,

Stefanovsky

et al. 2014

Glass Phys Chem

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show abstract

“…(2), Li 3 PO 4 should also be formed (half the amount of AlPO 4 ). Li 3 PO 4 has a lower melting point (1225 ℃) than AlPO 4 (2030 ℃) [44]. Li 3 PO 4 and AlPO 4 form a eutectic system at AlPO 4 /Li 3 PO 4 ≈ 60/40, which melts at 933 ℃ [44].…”

Section: (μM)mentioning

confidence: 99%

“…Li 3 PO 4 has a lower melting point (1225 ℃) than AlPO 4 (2030 ℃) [44]. Li 3 PO 4 and AlPO 4 form a eutectic system at AlPO 4 /Li 3 PO 4 ≈ 60/40, which melts at 933 ℃ [44]. We assume that this liquid aids in densification upon sintering.…”

Section: (μM)mentioning

confidence: 99%

Combined quantitative microscopy on the microstructure and phase evolution in Li1.3Al0.3Ti1.7(PO4)3 ceramics

Gunduz

Schierholz

et al. 2020

J Adv Ceram

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Lithium aluminum titanium phosphate (LATP) is one of the materials under consideration as an electrolyte in future all-solid-state lithium-ion batteries. In ceramic processing, the presence of secondary phases and porosity play an important role. In a presence of more than one secondary phase and pores, image analysis must tackle the difficulties about distinguishing between these microstructural features. In this study, we study the phase evolution of LATP ceramics sintered at temperatures between 950 and 1100 ℃ by image segmentation based on energy-dispersive X-ray spectroscopy (EDS) elemental maps combined with quantitative analysis of LATP grains. We found aluminum phosphate (AlPO 4) and another phosphate phase ((Li x)P y O z). The amount of these phases changes with sintering temperature. First, since the grains act as an aluminum source for AlPO 4 formation, the aluminum content in the LATP grains decreases. Second, the amount of secondary phase changes from more (Li x)P y O z at 950 ℃ to mainly AlPO 4 at 1100 ℃ sintering temperature. We also used scanning electron microscopy (SEM) and confocal laser scanning microscopy (CLSM) to study the evolution of the LATP grains and AlPO 4 , and LATP grain size increases with sintering temperature. In addition, transmission electron microscopy (TEM) was used for the determination of grain boundary width and to identify the amorphous structure of AlPO 4 .

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Review of Phosphorus Chemistry in the Thermal Conversion of Biomass: Progress and Perspectives

et al. 2023

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Phosphorus is vital for all life, which means that phosphorus is present in all biomass to some extent. Some types of biomass, such as certain agricultural residues, animal biomass, and sewage sludge, contain high levels of phosphorus. In thermal conversion of biomass, high levels of phosphorus can cause various operational problems. Extensive work has been carried out to understand the phosphorus chemistry taking place at higher temperatures. However, until now, knowledge about transformation chemistry and fate of phosphorus during thermal conversion of biomass was not easily accessible in one place. In this work, the outcome of an extensive literature review has been summarized. First, an introduction to the role of phosphorus in biomass, and in what forms it may be present, is given. Different analytical techniques relevant for characterization of phosphorus in biomass, biomass char, and biomass ash are described. A classification of phosphorus-rich biomass is proposed, and the potential of different phosphorus-rich biomass types is presented. To provide a common basis for the field of high-temperature phosphorus chemistry, fundamental chemistry relevant for thermal conversion of biomass is first discussed. This includes the gas phase chemistry and reaction pathways of light phosphorus species, pyrolysis, and combustion of organophosphorus compounds, and solid, liquid, and gaseous interactions with other ash-forming elements. Thereafter, an in-depth review of phosphorus transformations in biomass, including decomposition of organic phosphorus, ash transformations in the condensed phase, release to the gas phase, and formation of particulate matter in the flue gas follows. Finally, the review covers research focusing on phosphorus in different application aspects, such as the use of phosphorus as an additive to mitigate operational problems related to slag and deposit formation, the behavior of phosphorus in fluidized bed technologies, corrosion, and the deactivation of SCR catalysts.

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Les systemes binaires AlPO4−M3PO4 (M=Li, Na, K)

Cited by 5 publications

References 6 publications

Phase composition and structure of molybdenum-, copper-, and cesium-containing sodium aluminophosphate glassy materials for immobilization of high level wastes of nuclear reactors

Phase composition and structure of molybdenum-, copper-, and cesium-containing sodium aluminophosphate glassy materials for immobilization of high level wastes of nuclear reactors

Combined quantitative microscopy on the microstructure and phase evolution in Li1.3Al0.3Ti1.7(PO4)3 ceramics

Review of Phosphorus Chemistry in the Thermal Conversion of Biomass: Progress and Perspectives

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