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thorium phosphates orthorhombic

Th4(PO4)4P2O7, a New Thorium Phosphate: Synthesis

翻译此页The chemistry of thorium phosphate reported in the literature has been found to be erroneous. It was reconsidered in terms of careful chemical preparations and specific analytical methods. Special The chemistry of thorium phosphate reported in the literature has been found to be erroneous. It was reconsidered in terms of careful chemical preparations and specific analytical methods. Special attention has been paid to the atom ratio value referred to r = thorium/phosphorus, which was experimentally fixed in order to obtain the correct composition of the final compound.

Thermal synthesis and structural characterization of the

Thermal synthesis and structural characterization of the orthorhombic Th2(PO4)(P3O10) Article in Journal of Thermal Analysis and Calorimetry 118(2):759-765 · November 2014 with 37 Reads

Characterization of the thorium phosphate

Characterization of the thorium phosphate-hydrogenphosphate hydrate (TPHPH) and study of its transformation into the thorium phosphate-diphosphate (β-TPD)

Thorium processing | Britannica

翻译此页Thorium processing, preparation of the ore for use in various products. Thorium (Th) is a dense (11.7 grams per cubic centimetre) silvery metal that is softer than steel. It has a high melting Thorium processing, preparation of the ore for use in various products. Thorium (Th) is a dense (11.7 grams per cubic centimetre) silvery metal that is softer than steel. It has a high melting temperature of approximately 1,750 °C (3,180 °F). Below about 1,360 °C (2,480 °F), the metal exists in the

Grayite Wikipedia

翻译此页While previous work has identified grayite as a pseudohexagonal orthorhombic member of the rhabdophane group along with ningyoite, more contemporary work seems to maintain a hexagonal While previous work has identified grayite as a pseudohexagonal orthorhombic member of the rhabdophane group along with ningyoite, more contemporary work seems to maintain a hexagonal crystal structure. These hydrated phosphate minerals often include radioactive elements such as thorium, uranium, and cerium.Category: Phosphate minerals, Rhabdophane group

Synthesis of some new thorium phosphates ScienceDirect

· 翻译此页Synthesis of some new thorium phosphates. Thorium phosphate–diphosphate (TPD), Th 4 neither to the orthorhombic form (JCPDS 12-0096) nor to the hexagonal one (JCPDS 39-0620) Synthesis of some new thorium phosphates. Thorium phosphate–diphosphate (TPD), Th 4 neither to the orthorhombic form (JCPDS 12-0096) nor to the hexagonal one (JCPDS 39-0620) of the ThOF 2. Table 1. Results of elementary analysis of the synthesised compounds. Elements Weight %Cited by: 10

Chemistry of tetravalent actinide phosphates—Part I

· 翻译此页1. Introduction. The phosphates of two actinides, i.e., of thorium and uranium (IV) as well as of such tetravalent cations like Sn 4+, Ti 4+ or Zr 4+ were synthesized in the end of the 19th century. 1. Introduction. The phosphates of two actinides, i.e., of thorium and uranium (IV) as well as of such tetravalent cations like Sn 4+, Ti 4+ or Zr 4+ were synthesized in the end of the 19th century. However, the real interest in this subject began since the 1950s and the literature in this field is very rich.Cited by: 80

Thorium phosphates, method for preparing same, and use

翻译此页Sep 14, 1999· The invention relates to novel thorium phosphates, their preparation process and their use for the storage of radioactive products. These novel thorium phosphates The invention relates to novel thorium phosphates, their preparation process and their use for the storage of radioactive products. These novel thorium phosphates comply with the formulas Th 4 P 6 O 23 (I) or Th 4-x M 4x /v P 6 O 23 (III) in which: . M is a monovalent, divalent, trivalent or tetravalent cation,[PDF]

BROCKITE, A NEW CALCIUM THORIUM PHOSPHATE FROM

thorium in place of rare earths, and are either isostructural with rhabdo-phane (hexagonal) or are orthorhombic (pseudohexagonal). The two orthorhombic members of the group are ningyoite, thorium in place of rare earths, and are either isostructural with rhabdo-phane (hexagonal) or are orthorhombic (pseudohexagonal). The two orthorhombic members of the group are ningyoite, calcium uranium phosphate, from Ningyo Pass, Japan (Muto et al., 1959) and grayite, calcium thorium phosphate, from Southern Rhodesia (Bowie,

Thorium(IV) nitrate Wikipedia

翻译此页The thorium atom has 12-coordination, with four bidentate nitrate groups and four water molecules attached to each thorium atom. To obtain the anhydrous thorium(IV) nitrate, thermal The thorium atom has 12-coordination, with four bidentate nitrate groups and four water molecules attached to each thorium atom. To obtain the anhydrous thorium(IV) nitrate, thermal decomposition of Th(NO 3) 4 ·2N 2 O 5 is required. The decomposition occurs at 150-160 °C. Properties. Anhydrous thorium nitrate is a white substance.Appearance: Colorless crystal

Thorium phosphates, method for preparing same, and use

Sep 14, 1999· The invention relates to novel thorium phosphates, their preparation process and their use for the storage of radioactive products. These novel thorium phosphates comply with the formulas Th 4 P 6 O 23 (I) or Th 4-x M 4x /v P 6 O 23 (III) in which: . M is a monovalent, divalent, trivalent or tetravalent cation,

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From thorium phosphate hydrogenphosphate hydrate to

1 From thorium phosphate hydrogenphosphate hydrate to thorium phosphate diphosphate: structural evolution to a radwaste storage ceramic Gilles Wallez,a* Nicolas Clavierb, Nicolas Dacheuxb, Michel Quarton,a Wouter van Beekc a Université Pierre et Marie Curie-Paris6, CNRS UMR 7574, Chimie de la Matière Condensée de Paris, 4 place Jussieu, Paris, F-75005 France

From thorium phosphate hydrogenphosphate hydrate to β

Oct 01, 2006· Read "From thorium phosphate hydrogenphosphate hydrate to β -thorium phosphate diphosphate: Structural evolution to a radwaste storage ceramic, Journal of Solid State Chemistry" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

CA2108600A1 Process for processing soluble thorium

CA2108600A1 Process for processing soluble thorium compounds and novel thorium phosphate obtained thereby Google Patents Process for processing soluble thorium compounds and novel thorium phosphate obtained thereby This is a orthorhombic structure. Mais d'autres caractéristiques, aspects et avantages de l'invention apparaitront20

Thermal synthesis and structural characterization of the

Jul 20, 2014· Polycrystalline thorium(IV) phosphate-triphosphate, Th 2 (PO 4)(P 3 O 10) (), was obtained by (NH 4) 2 Th(PO 4) 2 ·H 2 O heating from room temperature to 1,273 K. 1 crystallizes in the orthorhombic space group Pn2 1 a (a = 11.6846() Å, b = 7.1746() Å, c = 12.9320() Å, Z = 4). Combining powder synchrotron X-ray diffraction data and DFT geometry optimization, a structural model is

Characterization of the thorium phosphate

It was first dehydrated leading to the anhydrous thorium phosphate-hydrogenphosphate (TPHP, orthorhombic system with a = 21.229(2) Å, b = 6.661(1) Å and c = 7.031(1) Å at 220 °C) after heating between 180 and 200 °C.

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THORIUM PHOSPHATE-DIPHOSPHATE AS A CERAMIC FOR

Among the solids synthesized, the thorium phosphate-diphosphate Th4(PO4)4P2O7 (TPD) was obtained through several ways of synthesis (using wet and dry chemistry methods) then characterized. The ab initio structure determination on powder and single crystal led to an orthorhombic unit cell (space group Pcam, Z = 2) with

Investigation of the system ThO <SUB>2</SUB>-NpO <SUB>2

Abstract. Considering that phosphate matrices could be potential candidates for the immobilization of actinides or for the final disposal of the excess plutonium from dismantled nuclear weapons, the chemistry of thorium phosphates has been re-examined.

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Developmental Activities Related to Thorium Purification

235 or Pu-239 . Thorium (fertile) has to be combined with Uranium (fissile) for start up. A very soft, ductile metal , hence need to be strengthened or alloyed. Thorium metal offers the advantage of high density and thermal conductivity over currently used thoria. Cubic system [unalloyed orthorhombic

Uranium Crystal Structure

Thorium is moderately hard, malleable, and has a high melting point. Thorium is a naturally-occurring element and it is estimated to be about three times more abundant than uranium. Thorium is commonly found in monazite sands (rare earth metals containing phosphate mineral).

Thorite: Mineral information, data and localities.

An orange variety of Thorite which Bergeman & Krantz (the famous mineral dealer) described as a new mineral form 'Brevig' (= syenite pegmatites from Langesundsfjorden, Larvik, Vestfold, Norway) in 1851 (see also Clark, 1993 "Hey's Mineral Index"). Phosphothorite: A variety of thorite which contains P and other foreign elements (mainly REE, Ca

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Environmental chemistry of uranium

orthorhombic, tetragonal and in body-centered cubic ones [28]. Uranium exhibits a high melting point (1132 C) and it is one of the heaviest naturally occurring elements. The density of uranium (19.05 g cm−3) is 65% higher than that of lead [12, 14]. Uranium can be prepared from its oxide via reduction by calcium or magnesium.

Uranium Gamma Spectrometry | PhysicsOpenLab

Autunite (hydrated calcium uranyl phosphate) with formula: Ca(UO 2) 2 (PO 4) 2 ·10-12H 2 O. Is a yellow – greenish fluorescent mineral with a hardness of 2 – 2½. Autunite crystallizes in the orthorhombic system and often occurs as tabular square crystals.

Jean-Luc Le Loarer Inventions, Patents and Patent

May 03, 2012· Abstract: Environmental pollution stemming from the industrial discharge and/or storage of water-soluble thorium compounds is avoided by converting same into essentially innocuous water-insoluble thorium phosphates, notably orthorhombic thorium phosphates, by (i) reacting such water-soluble thorium compounds, e.g., the nitrates and/or chlorides

CA2108600A1 Process for processing soluble thorium

CA2108600A1 Process for processing soluble thorium compounds and novel thorium phosphate obtained thereby Google Patents Process for processing soluble thorium compounds and novel thorium phosphate obtained thereby This is a orthorhombic structure. Mais d'autres caractéristiques, aspects et avantages de l'invention apparaitront20

Thermal synthesis and structural characterization of the

Jul 20, 2014· Polycrystalline thorium(IV) phosphate-triphosphate, Th 2 (PO 4)(P 3 O 10) (), was obtained by (NH 4) 2 Th(PO 4) 2 ·H 2 O heating from room temperature to 1,273 K. 1 crystallizes in the orthorhombic space group Pn2 1 a (a = 11.6846() Å, b = 7.1746() Å, c = 12.9320() Å, Z = 4). Combining powder synchrotron X-ray diffraction data and DFT geometry optimization, a structural model is

Chemical Conditions of Synthesis of Th4(PO4)4P2O7

Thorium phosphate−diphosphate, Th4(PO4)4P2O7, is obtained, at high temperature (800−1250 °C), for a given ratio r = PO4/Th equal to 3/2 from a thorium compound and a phosphating reactant whatever the chemical conditions. This compound, whose solubility is very low, can be loaded in situ and used as a host matrix for radwaste storage. One of the methods for its synthesis involves the

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THORIUM PHOSPHATE-DIPHOSPHATE AS A CERAMIC FOR

Among the solids synthesized, the thorium phosphate-diphosphate Th4(PO4)4P2O7 (TPD) was obtained through several ways of synthesis (using wet and dry chemistry methods) then characterized. The ab initio structure determination on powder and single crystal led to an orthorhombic unit cell (space group Pcam, Z = 2) with

From thorium phosphate hydrogenphosphate hydrate to

Abstract $\beta$-Thorium phosphate diphosphate ($\beta$-TPD), considered as a very promising radwaste storage material, was obtained from thorium phosphate hydrogenphosphate hydrate (TPHPH) precursor through dehydration and hydrogen phosphate condensation.

From thorium phosphate hydrogenphosphate hydrate to β

Oct 01, 2006· Read "From thorium phosphate hydrogenphosphate hydrate to β -thorium phosphate diphosphate: Structural evolution to a radwaste storage ceramic, Journal of Solid State Chemistry" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

Investigation of the system ThO <SUB>2</SUB>-NpO <SUB>2

Considering that phosphate matrices could be potential candidates for the immobilization of actinides or for the final disposal of the excess plutonium from dismantled nuclear weapons, the chemistry of thorium phosphates has been re-examined. In the ThO 2 -P 2 O 5 system, the thorium phosphate-diphosphate Th 4</SUB>(PO <SUB>4</SUB>) <SUB>4</SUB>P <SUB>2</SUB>O <SUB>7</SUB> (TPD) can

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Developmental Activities Related to Thorium Purification

235 or Pu-239 . Thorium (fertile) has to be combined with Uranium (fissile) for start up. A very soft, ductile metal , hence need to be strengthened or alloyed. Thorium metal offers the advantage of high density and thermal conductivity over currently used thoria. Cubic system [unalloyed orthorhombic

Sintering of $\^beta$-Thorium-Uranium(IV) Phosphate

Abstract. RADIOCHPure and single phase thorium-uranium(IV) phosphate-diphosphate -TUPD (orthorhombic form) dense pellets were prepared by two wet

Actinide Wikipedia

Thorium also has good electron emission properties, with long lifetime and low potential barrier for the emission. The relative content of thorium and uranium isotopes is widely used to estimate the age of various objects, including stars (see radiometric dating).

Nickel double salts Wikipedia

Nickel is one of the metals that can form Tutton's salts.The singly charged ion can be any of the full range of potassium, rubidium, cesium, ammonium (), or thallium.As a mineral the ammonium nickel salt, (NH 4) 2 Ni(SO 4) 2 • 6H 2 O, can be called nickelboussingaultite. With sodium, the double sulfate is nickelblödite Na 2 Ni(SO 4) 2 • 4H 2 O from the blödite family.

Thorite: Mineral information, data and localities.

An orange variety of Thorite which Bergeman & Krantz (the famous mineral dealer) described as a new mineral form 'Brevig' (= syenite pegmatites from Langesundsfjorden, Larvik, Vestfold, Norway) in 1851 (see also Clark, 1993 "Hey's Mineral Index"). Phosphothorite: A variety of thorite which contains P and other foreign elements (mainly REE, Ca

Uranium Crystal Structure

Thorium is moderately hard, malleable, and has a high melting point. Thorium is a naturally-occurring element and it is estimated to be about three times more abundant than uranium. Thorium is commonly found in monazite sands (rare earth metals containing phosphate mineral).

Phosphorus Wikipedia

Phosphorus is a chemical element with the symbol P and atomic number 15. Elemental phosphorus exists in two major forms, white phosphorus and red phosphorus, but because it is highly reactive, phosphorus is never found as a free element on Earth.It has a concentration in the Earth's crust of about one gram per kilogram (compare copper at about 0.06 grams).