Infrared Spectroscopy and Structure of Trigonal Zirconium Orthophosphates with Lanthanides and Actinides

Kurazhkovskaya, V. S.; Bykov, D. M.; Орлова, А. И.

doi:10.1007/s10947-005-0087-5

Cited by 18 publications

(20 citation statements)

References 5 publications

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“…The absorption bands at 1180–990 cm –1 refer to the asymmetric stretching vibrations ν 3 , and the bands at 980–900 cm –1 to the symmetric stretching vibrations ν 1 of P–O bonds in phosphate groups. Absorption bands at 650–440 cm –1 correspond to δ (O–P–O), and those at 440 cm –1 correspond to symmetric ν 2 vibrations (see Figure ) …”

Section: Resultsmentioning

confidence: 99%

Crystallization Pathways of Cerium(IV) Phosphates Under Hydrothermal Conditions: A Search for New Phases with a Tunnel Structure

et al. 2019

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Section: Resultsmentioning

confidence: 99%

Crystallization Pathways of Cerium(IV) Phosphates Under Hydrothermal Conditions: A Search for New Phases with a Tunnel Structure

et al. 2019

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“…In this case the compounds with the general composition Ln 1/3 Zr 2 (PO 4 ) 3 are formed [9,13]. Detailed investigation of these compounds by IR spectroscopy carried out in [14] showed the reduction of symmetry, accompanied with the change of space group from R3c in AZr 2 (PO 4 ) 3 (A = alkali metals) to R3 in B 1/2 Zr 2 (PO 4 ) 3 (B = alkaline-earth metals and some d-elements) and to P3c in R 1/3 Zr 2 (PO 4 ) 3 (R = rare earths).…”

Section: Introductionmentioning

confidence: 99%

High-temperature investigations of the rare earth NZP phosphates R1/3Zr2(PO4)3 (R= La, Nd, Eu, Lu) by drop calorimetry

Bykov

Konings

Орлова

2007

Journal of Alloys and Compounds

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“…In the 1000-1100 cm -1 region, after detemplating we observe broadening of the group of absorption bands (Fig. 2b, spectrum 3) assigned to the vibrations n as (PO) 4 and n s (PO) 4 , which probably is due to the fact that the P-O bonds in the tetrahedra become covalent to a greater extent due to conversion of the (P)-OH groups to (P)-OZr groups [2,22,23]. We can also see a similar pattern for the ZrP-l sample (Fig.…”

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confidence: 86%

Effect of Synthesis Conditions on Formation of Thermally Stable Mesoporous Zirconium Phosphate

2014

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UDC 544.723.21 E. V. Senchylo, V. L. Struzhko, and V. N. SolomakhaWe have studied the effect of synthesis conditions on formation of thermally stable mesoporous zirconium phosphate. We have used X-ray diffraction, temperature-programmed desorption of ammonia, IR spectroscopy, NMR, and DTA to establish that formation of hexagonally ordered materials which are stable during detemplating is possible only when using cationic and nonionic surfactants, a temperature of 20°C, and post-synthesis treatment with a solution of orthophosphoric acid. We have established that, depending on the ordering, there is a change in both the adsorption characteristics of the zirconium phosphate as well as the concentration of acid sites and their strength distribution.In recent years, inorganic ion-exchange materials, in particular zirconium phosphates, have attracted increasing attention mainly due to their ability to meet a number of requirements imposed by modern technology. They are characterized by higher stability (compared with organic ion exchangers) at elevated temperatures and when exposed to rather intense radioactive radiation. Zirconium phosphate is also quite resistant to acids, except for HF, H 2 SO 4 , and H 2 C 2 O 4 , which form complexes with zirconium. Furthermore, zirconium phosphates and its modified forms, along with metal oxides, zeolites, molecular sieves, activated carbons, and other porous materials, are widely used as catalyst supports and catalysts in isomerization reactions [1], Friedel-Crafts acylation using benzyl chloride [2], and also as a matrix for controlled assembly of semiconductor clusters and organic molecules [3,4]. These materials can be used in nonlinear optics, in electronic and optical processes [5], and also as proton conductors in proton exchange membranes in fuel cells for direct conversion of chemical energy to electrical energy [6].Most widely studied have been zirconium phosphates with a layered structure which, depending on the synthesis method, have different crystal structures of the a-zirconium phosphate type (a-ZrP) of composition Zr(HPO 4 ) 2 ·H 2 O, g-zirconium phosphate (g-ZrP) of composition Zr(PO 4 )·(H 2 PO 4 )·2H 2 O, or zirconium pyrophosphate ZrP 2 O 7 [7]. Owing to the presence on the surface of layers of POH groups, a-zirconium phosphate is stable at high temperatures (700-800°C) [8]. The method for obtaining layered zirconium phosphates involves precipitation from acidic solutions of zirconium salts with the help of phosphoric acid, differently substituted sodium or ammonium phosphates. Phosphates of tetravalent metals are formed in strongly acidic medium (pH 0-1) [3]. Zr 4+ ions in solution are usually hydrated by six water molecules, while in Zr(HPO 4 ) 2 ·H 2 O they are found in an octahedral environment of six oxygen atoms of HPO 4 2-anions. Therefore the process of

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Infrared Spectroscopy and Structure of Trigonal Zirconium Orthophosphates with Lanthanides and Actinides

Cited by 18 publications

References 5 publications

Crystallization Pathways of Cerium(IV) Phosphates Under Hydrothermal Conditions: A Search for New Phases with a Tunnel Structure

Crystallization Pathways of Cerium(IV) Phosphates Under Hydrothermal Conditions: A Search for New Phases with a Tunnel Structure

High-temperature investigations of the rare earth NZP phosphates R1/3Zr2(PO4)3 (R= La, Nd, Eu, Lu) by drop calorimetry

Effect of Synthesis Conditions on Formation of Thermally Stable Mesoporous Zirconium Phosphate

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