Effect of the synthesis conditions on the formation of MgSrP2O7 and its characterisation for pigmentary application

Gorodylova, Nataliia; Dohnalová, Žaneta; Šulcová, Petra

doi:10.1007/s10973-012-2884-3

Cited by 6 publications

(3 citation statements)

References 35 publications

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“…This fact determinates the initial the TF0 as isomorphically substituted CAp and it is in conformity with the conditions of their formation. Appearance of a new band in the region of this doublet is assigned to CO 3 2-which substitutes F -along the hexagonal axis and in the channel structure of apatite (A1 and A2-type substitution) [15][16][17][18][19][20][21]. The mechanism of this type of substitution most probably contains the following steps-involving of CO 2 from air, partly decomposition of calcite, and relocation and migration of carbonate ions from tetrahedral positions of the phosphate ion [3].…”

Section: Ftir Measurementsmentioning

confidence: 94%

Structural and thermal transformations on high energy milling of natural apatite

Petkova

Koleva

Kostova

et al. 2014

J Therm Anal Calorim

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In this work we investigated the isomorphic substitution and thermal decomposition of sedimentary fluor apatite (FAp) (with Ca/P ratio [ 1.67) from Tunisia after high-energy-milling (HEM) activation at different times from 10 to 600 min. The chemical composition of the material includes: 29.6 % P 2 O 5 total and 46.5 % CaO (main components) and 3.5 % F; 0.55 % R 2 O 3 (R = Al, Fe); 1.1 % SO 3 ; 1.9 % SiO 2 (a low content in a comparison with other natural apatites from North Africa or Asia); 0.35 % MgO; 0.05 % Cl; 6.6 % CO 2 are impurities. HEM is a well-known approach for preparing various solid materials and for increasing their reactivity. The solid-state transformation of the initial and HEM-activated apatite samples was examined by chemical analysis, BET, powder XRD, FTIR spectroscopy, and thermal analysis. The structure of natural apatite allows isomorphic substitutions of carbonate, hydroxyl, and metal ions by PO 4 3-, Ca 2? , and F -. The obtained powder XRD data indicate an increased defectiveness of the apatite structure in the course of the HEM. The solid-state transformations of the initial and HEM-activated apatite are examined by TG-DTA analyses. It is found that the thermal stability of the activated samples decreases as compared to the initial sample. This is related to the increased defectivity of the apatite structure during the high-energy milling shown by the XRD data. The thermal analysis allows the differentiation of the structurally bonded A, B, and A-B types carbonate ions from these originating from the calcite and dolomite admixtures. The results obtained demonstrate that the mechanical distortion and the structural changes related to the migration of the carbonate ions from B type to A-type channel positions are the main factors responsible for the enhanced solubility of the high-energy activated FAp.

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Section: Ftir Measurementsmentioning

confidence: 94%

Structural and thermal transformations on high energy milling of natural apatite

Petkova

Koleva

Kostova

et al. 2014

J Therm Anal Calorim

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“…Therefore this interaction (including dehydration) and the following decomposition of NH 4 Cl did not became dominating features on the thermoanalytical curves, as it was observed for the mixtures with high content of ZrOCl 2 ·8H 2 O (x = 0.1). Instead, the general features of the DTA-TG curves are very similar to the characteristic thermal behaviour of (NH 4 ) 2 HPO 4 and its mixtures: release of ammonia around 200 • C and condensation of phosphate anion between 350 and 400 • C are usually dominating processes [20,43,44]. Thus, common features which were observed for the samples of both models are the following:…”

Section: Thermoanalytical Investigation Of the Reaction Mixturesmentioning

confidence: 72%

Heterovalent Zr4+-Cu2+ substitution in zirconium pyrophosphate: From theoretical models to synthesis and utilization

Gorodylova

Šulcová

Bosacka

et al. 2015

Journal of the European Ceramic Society

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“…Among the diphosphates, SrM II P 2 O 7 (M = Mg, Cr, Cu) have shown interesting relationships among chemical constitution, crystal structure, and luminescence properties (7). SrMgP 2 O 7 -based compounds are known to be efficient phosphors (8)(9)(10) and as corrosion inhibitor pigments (11,12). The biocompatibility of calcium pyrophosphate (Ca 2 P 2 O 7 , CPP) has been demonstrated in numerous experiments; in addition, it was shown that CPP possesses osteostimulating and bioresorptive properties (13).…”

Section: Introductionmentioning

confidence: 99%

Luminescence and energy transfer in Ce³⁺, Mn^2+‐doped K₂AEP₂O₇ (AE = Ca, Sr) phosphor

Hatwar¹,

Wankhede²,

Moharil

et al. 2015

Luminescence

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Pyrophosphates K2AEP2O7 (AE = Ca, Sr) prepared by the classical solid-state technique and activated with Ce(3+) are described. Intense emission was observed in K2AEP2O7 (AE = Ca, Sr). The effect of Mn(2+) co-doping was studied. The broad emission peak of Mn(2+) was observed at 534 nm in K2 rP2O7:Ce(3+) and at 539 nm in K2CaP2O7:Ce(3+), Mn(2+). Mn(2+) emission was greatly enhanced by addition of the sensitizer Ce(3+) due to efficient energy transfer from Ce(3+) to Mn(2+).

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Effect of the synthesis conditions on the formation of MgSrP2O7 and its characterisation for pigmentary application

Cited by 6 publications

References 35 publications

Structural and thermal transformations on high energy milling of natural apatite

Structural and thermal transformations on high energy milling of natural apatite

Heterovalent Zr4+-Cu2+ substitution in zirconium pyrophosphate: From theoretical models to synthesis and utilization

Luminescence and energy transfer in Ce³⁺, Mn^2+‐doped K₂AEP₂O₇ (AE = Ca, Sr) phosphor

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Effect of the synthesis conditions on the formation of MgSrP2O7 and its characterisation for pigmentary application

Cited by 6 publications

References 35 publications

Structural and thermal transformations on high energy milling of natural apatite

Structural and thermal transformations on high energy milling of natural apatite

Heterovalent Zr4+-Cu2+ substitution in zirconium pyrophosphate: From theoretical models to synthesis and utilization

Luminescence and energy transfer in Ce3+, Mn2+‐doped K2AEP2O7 (AE = Ca, Sr) phosphor

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Luminescence and energy transfer in Ce³⁺, Mn^2+‐doped K₂AEP₂O₇ (AE = Ca, Sr) phosphor