Synthesis, characterization and non-isothermal decomposition kinetics of manganese hypophosphite monohydrate

Noisong, Pittayagorn; Danvirutai, Chanaiporn; Srithanratana, Tipaporn; Boonchom, Banjong

doi:10.1016/j.solidstatesciences.2008.02.020

Cited by 65 publications

(43 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These ΔS* values suggest a large number of degrees of freedom due to rotation which may be interpreted as a "slow" stage [22][23][24] in this step. The positive values of ΔG* at all studied methods are due to the fact that, the dehydration processes are not spontaneous.…”

Section: Study In Successive Temperature Levelsmentioning

confidence: 99%

Structural modifications from NiNa3P3O10•12H2O toNiNa3P3O10 new triphosphate during dehydration process

Tridane

Fahim

Benmokhtar

et al. 2015

Phosphorus Research Bulletin

View full text Add to dashboard Cite

A nickel-sodium triphosphate NiNa 3 P 3 O 10 ·12H 2 O already known has been prepared by the method of ion exchange resin of aqueous chemistry and studied by X-Ray diffraction, thermal analyses (TGA-DTA) and infrared spectrometry which show the characteristic bands of a triphosphate P 3 O 10 5-. The results of the compound heated at different temperatures showed that, after dehydration, NiNa 3 P 3 O 10 ·12H 2 O decomposes into an amorphous compound, then it crystallizes at 700 °C in order to give the new triphosphate NiNa 3 P 3 O 10 . NiNa 3 P 3 O 10 crystallizes in the hexagonal system, space group P -3 1 c, Z = 2 with the following unit-cell dimensions: a = b = 13.310 (5)

show abstract

Section: Study In Successive Temperature Levelsmentioning

confidence: 99%

Structural modifications from NiNa3P3O10•12H2O toNiNa3P3O10 new triphosphate during dehydration process

Tridane

Fahim

Benmokhtar

et al. 2015

Phosphorus Research Bulletin

View full text Add to dashboard Cite

show abstract

“…However, in the infrared spectra of AHP the characteristic bands of water molecules are not present, indicating that the compound is anhydrous. The bands in the region of 2,300-2,450 cm -1 observed in all the metal hypophosphites are attributed to PH 2 stretching modes [16]. The bands between 1,100 and 1,250 cm -1 are in correspondence to [17].…”

Section: Resultsmentioning

confidence: 78%

“…The bands in the region of 3,230-3,460 cm -1 observed in the compounds of LHP and CHP are attributed to O-H stretching vibrations [16]. The weak peak at 1,632 cm -1 is attributed to the bending vibration of H 2 O.…”

Section: Resultsmentioning

confidence: 88%

Using TG–FTIR and TG–MS to study thermal degradation of metal hypophosphites

Liu

et al. 2014

J Therm Anal Calorim

View full text Add to dashboard Cite

Three typical metal hypophosphite flame retardants La(H 2 PO 2 ) 3 ÁH 2 O (LHP), Ce(H 2 PO 2 ) 3 ÁH 2 O (CHP), and Al(H 2 PO 2 ) 3 (AHP) were synthesized and characterized by Fourier transform infrared spectroscopy (FTIR), X-ray powder diffraction, scanning electron microscopy, thermogravimetric analysis (TG), derivative thermogravimetric analysis, and differential thermal analysis. The thermal degradation products from the synthesized metal hypophosphites were also investigated using thermogravimetry coupled with Fourier transform infrared spectroscopy (TG-FTIR) and thermogravimetry coupled with mass spectrometry (TG-MS). The synthesized metal hypophosphites were also used as flame retardants for poly (1,4-butylene terephthalate) (PBT), and the combustion properties of flame-retarded PBT were evaluated using the limiting oxygen index and UL-94 tests. The results showed that the metal hypophosphites LHP, CHP, and AHP can be used as effective flame retardants for PBT, and these compounds can be obtained through a simple precipitation method. TG-FTIR and TG-MS results showed that the degradation process of AHP involves two steps, corresponding to the removal PH 3 reaction and the further dehydration reaction of the hydrogen phosphate aluminum. While LHP and CHP have three degradation steps, the additional step is due to that LHP and CHP which will loss the crystal water at lower temperature.

show abstract

“…The negative values of S* from two methods for the dehydration step reveals that the activated state is less disordered compared to the initial state. These S* values suggest a large number of degrees of freedom due to rotation which may be interpreted as a «slow» stage [20,21] in this step. The positive values of G* at all studied methods are due to the fact that, the dehydration processes are not spontaneous.…”

Section: ) Estimation Of the Thermodynamic Functionsmentioning

confidence: 99%

Physico-chemical studies of MgNa₃P₃O₁₀·12H₂O

Fahim

Tridane

Belaaouad

2013

MATEC Web of Conferences

View full text Add to dashboard Cite

Abstract.A magnesium-sodium triphosphate MgNa 3 P 3 O 10 · 12H 2 O already known has been prepared by the method of ion exchange resin of aqueous chemistry and studied by X-Ray diffraction, thermal analyses (TGA-DTA), differential scanning calorimetry (DSC) and infrared spectrometry which show the characteristic bands of a triphosphate P 3 O 5− 10 . The results of differential thermal analysis, X-Ray powder diffraction and IR spectra of the compound heated at different temperatures showed that, after dehydration, MgNa 3 P 3 O 10 · 12H 2 O decomposes into an amorphous compound, then it crystallizes at 600 • C in order to give the anhydrous triphosphate MgNa 3 P 3 O 10 . MgNa 3 P 3 O 10 is stable until its melting point at 612 • C. Two different methods Ozawa and KAS have been selected in studying the kinetics of thermal behavior of the triphosphate P 3 O 10 for the first time. The kinetic and thermodynamic characteristics of the dehydration of MgNa 3 P 3 O 10 · 12H 2 O and the thermal phenomena accompanying this dehydration were determinated and discussed on the basis of the proposed crystalline structure.

show abstract

Synthesis, characterization and non-isothermal decomposition kinetics of manganese hypophosphite monohydrate

Cited by 65 publications

References 26 publications

Structural modifications from NiNa<SUB>3</SUB>P<SUB>3</SUB>O<SUB>10</SUB>•12H<SUB>2</SUB>O toNiNa<SUB>3</SUB>P<SUB>3</SUB>O<SUB>10</SUB> new triphosphate during dehydration process

Structural modifications from NiNa<SUB>3</SUB>P<SUB>3</SUB>O<SUB>10</SUB>•12H<SUB>2</SUB>O toNiNa<SUB>3</SUB>P<SUB>3</SUB>O<SUB>10</SUB> new triphosphate during dehydration process

Using TG–FTIR and TG–MS to study thermal degradation of metal hypophosphites

Physico-chemical studies of MgNa₃P₃O₁₀·12H₂O

Contact Info

Product

Resources

About

Synthesis, characterization and non-isothermal decomposition kinetics of manganese hypophosphite monohydrate

Cited by 65 publications

References 26 publications

Structural modifications from NiNa<SUB>3</SUB>P<SUB>3</SUB>O<SUB>10</SUB>&bull;12H<SUB>2</SUB>O toNiNa<SUB>3</SUB>P<SUB>3</SUB>O<SUB>10</SUB> new triphosphate during dehydration process

Structural modifications from NiNa<SUB>3</SUB>P<SUB>3</SUB>O<SUB>10</SUB>&bull;12H<SUB>2</SUB>O toNiNa<SUB>3</SUB>P<SUB>3</SUB>O<SUB>10</SUB> new triphosphate during dehydration process

Using TG–FTIR and TG–MS to study thermal degradation of metal hypophosphites

Physico-chemical studies of MgNa3P3O10·12H2O

Contact Info

Product

Resources

About

Structural modifications from NiNa<SUB>3</SUB>P<SUB>3</SUB>O<SUB>10</SUB>•12H<SUB>2</SUB>O toNiNa<SUB>3</SUB>P<SUB>3</SUB>O<SUB>10</SUB> new triphosphate during dehydration process

Structural modifications from NiNa<SUB>3</SUB>P<SUB>3</SUB>O<SUB>10</SUB>•12H<SUB>2</SUB>O toNiNa<SUB>3</SUB>P<SUB>3</SUB>O<SUB>10</SUB> new triphosphate during dehydration process

Physico-chemical studies of MgNa₃P₃O₁₀·12H₂O