Thermal decomposition kinetics of Mn0.9Co0.1HPO4·3H2O using experimental-model comparative and thermodynamic studies

Sronsri, Chuchai; Noisong, Pittayagorn; Danvirutai, Chanaiporn

doi:10.1007/s10973-016-5720-3

Cited by 18 publications

(13 citation statements)

References 54 publications

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“…8, whereas the corresponding assignments were tabulated in Table 4. The FTIR spectra observed in this research closely like to the spectral results reported in the literatures 12,13,[15][16][17]45 The Raman spectroscopic technique was additionally applied to investigate and support the FTIR results, especially the vibrational spectroscopy of the metal oxide (M−O) bond as well as the lattice vibration by observing at the low frequency range (650−100 cm −1 ). Furthermore, the phase characteristics (α-, β-phases) of the metal pyrophosphate compounds can be observed from this spectroscopic technique.…”

Section: Resultssupporting

confidence: 75%

“…dittmarite (NH 4 MgPO 4 •H 2 O), struvite (NH 4 MgPO 4 •6H 2 O), and newberyite (MgHPO 4 •3H2O), as the precursors12 . Binary metal pyrophosphates, such as Mn 1.8 Co 0.2 P 2 O 7 was synthesized from the thermal decomposition of manganese cobalt hydrogen phosphate trihydrate (Mn 0.9 Co 0.1 HPO 4 •3H 2 O)13 . Another binary metal compound, CaCuP 2 O 7 , was synthesized by using a mixture of diammonium hydrogen phosphate ((NH 4 ) 2 HPO 4 ), calcium carbonate (CaCO 3 ), and copper oxide (CuO) with the losses of carbon dioxide (CO 2 ) and ammonia (NH 3 ) gasses based on the following equation (Eq.…”

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confidence: 99%

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Correlation Between Structure, Chromaticity, and Dielectric Properties of Calcium Copper Pyrophosphates, Ca2−xCuxP2O7

Baitahe

Sron

Thompho

et al. 2022

Preprint

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Discoveries of the correlation between the physical properties and structure of the materials are interesting in the field of the material science and chemical engineering. This work investigated the correlation between the structure, chromaticity, and dielectric properties of calcium copper pyrophosphates, Ca2−xCuxP2O7. The solid state thermal decomposition reaction was employed to synthesize the Ca2−xCuxP2O7 by varying the mole ratio between Ca and Cu. The structure and crystallography of the pyrophosphate compounds were identified and confirmed by using an X-ray diffraction (XRD) technique. The Rietveld refinement method and the extended X-ray absorption fine structure (EXAFS) least-squares fitting technique were also applied to refine the sample crystal structure. The bond angle and bond length of samples were also obtained from the refinement method. The X-ray absorption edge energies (E0) of the synthesized compounds were investigated and the obtained results confirmed the formation of the binary metal pyrophosphates (Ca2−xCuxP2O7). The image sensor result of the Cu2P2O7 sample (x = 2.00) illustrated a yellowish-green color, while other compounds (x = 0.50−1.50) presented color tones that changed from blue-green to bluish-green. The dielectric constant (εr) of the synthesized Ca2−xCuxP2O7 were calculated by using the Clausius-Mossotti relation, and the highest εr was observed for Ca2P2O7. The Raman and Fourier transform infrared (FTIR) spectrophotometers were employed to characterize and confirm the vibrational characteristics of the P2O74− group. The experimental results demonstrated that the changing in the crystal structure of Ca2−xCuxP2O7 (i.e., bond angle of P−O−P in P2O74− and distortion phenomena in M−O6 octahedral site) can cause the correlation between the dielectric and optical properties of the sample.

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Section: Resultssupporting

confidence: 75%

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confidence: 99%

Correlation Between Structure, Chromaticity, and Dielectric Properties of Calcium Copper Pyrophosphates, Ca2−xCuxP2O7

Baitahe

Sron

Thompho

et al. 2022

Preprint

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“…12. It is further verified that the synthesis reaction process of Bi2212 phase follows random nucleation and subsequent growth (n = 3) model, which have been reported previously [28,30,31,47,48]. The model presumes that the reaction first occurs at some local points, and then the adjacent decomposition products accumulate into a nucleus of a new phase.…”

Section: Non-isothermal Kinetics Of Bi2212 Precursorssupporting

confidence: 82%

“…The kinetic calculations based on the empirical formula Arrhenius equation and the kinetic methods can be conventionally divided into differential and integral methods. These methods require the values of da/ dT which can be conveniently applied to the data of DTA and DSC experiments [27][28][29]. Thus, the reaction model can be numerically reconstructed by the values of the pre-exponential factor A and the activation energy E. The dependence of time and temperature on the reaction rate can be also obtained.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Bi2Sr2CaCu2O8+δ(Bi2212) superconductor by Pechini sol–gel method: thermal decomposition and phase formation kinetics of the precursors

Zhao

Wang

et al. 2020

J Mater Sci: Mater Electron

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Bi2212 high-temperature superconductors were prepared using Pechini sol-gel method, and the thermal decomposition process under air condition was obtained by synchronous thermal analyzer. The synthesis mechanisms of Bi2212 phase were determined by the combination of universal integral, differential and multi-rate scanning methods. The crystallization behavior, morphology, and superconductivity of the samples were characterized and analyzed by XRD, FESEM, PPMS, and SQUID, respectively. The results exhibited that the thermal decomposition reactions of the precursors were divided into three stages. The kinetics of Bi2212 synthesis reaction followed the mechanism mode of random nucleation and subsequent growth (n = 3) during the third stage which were used to guide the heat treatment of the final products. The average activation energy and the pre-finger factor of the synthesis reaction were 226 kJ/mol and 1.84 9 10 11 /min, respectively. Finally, the Bi2212 superconductor with high purity and acceptable performance with the T c, onset of 77.1 K, T c, zero of 63.5 K, and the J c of 5.94 9 10 4 A/cm 2 , respectively, were prepared with shorter sintering time.

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“…Unary metal pyrophosphate, such as Mg 2 P 2 O 7, was thermally synthesized by using minerals such as dittmarite (NH 4 MgPO 4 ·H 2 O), struvite (NH 4 MgPO 4 ·6H 2 O), and newberyite (MgHPO 4 ·3H 2 O) as precursors 12 . Binary metal pyrophosphates, such as Mn 1.8 Co 0.2 P 2 O 7 , were synthesized from the thermal decomposition of manganese cobalt hydrogen phosphate trihydrate (Mn 0.9 Co 0.1 HPO 4 ·3H 2 O) 13 . Another binary metal compound, CaCuP 2 O 7 , was synthesized by using a mixture of diammonium hydrogen phosphate ((NH 4 ) 2 HPO 4 ), calcium carbonate (CaCO 3 ), and copper oxide (CuO) with the losses of carbon dioxide (CO 2 ) and ammonia (NH 3 ) gases based on the following equation (Eq.…”

Section: Introductionmentioning

confidence: 99%

Correlation between structure, chromaticity, and dielectric properties of calcium copper pyrophosphates, Ca2−xCuxP2O7

Baitahe

Sronsri

Thompho

et al. 2022

Sci Rep

Self Cite

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The solid-state reaction was employed to synthesize Ca2−xCuxP2O7 by varying the mole ratio between Ca and Cu. The structure and crystallography of the pyrophosphate compounds were identified and confirmed by using X-ray diffraction (XRD). The Rietveld refinement method and the extended X-ray absorption fine structure (EXAFS) least-squares fitting technique were also applied to refine the sample crystal structure. The single phases of the obtained Ca2P2O7, CaCuP2O7, and Cu2P2O7 samples and the mixing phases of the obtained Ca1.5Cu0.5P2O7 and Ca0.5Cu1.5P2O7 samples were identified, and then only a single phase of the samples was subjected to structural and dielectrical analyses. The structural results exhibit the tetragonal crystal system with the P41 space group for β-Ca2P2O7, the monoclinic crystal system with the P21/c space group for CaCuP2O7, and the C2/c space group for α-Cu2P2O7. The dielectric constant (εr) of the single metal pyrophosphates (Ca2P2O7 and Cu2P2O7) was higher than that of binary metal pyrophosphates (CaCuP2O7). The image sensor result of the Cu2P2O7 sample (x = 2.00) illustrated a yellowish-green color, while other compounds (x = 0.50−1.50) presented color tones that changed from blue-green to bluish-green. Raman and Fourier transform infrared (FTIR) spectrophotometers were employed to characterize and confirm the vibrational characteristics of the P2O74− group, which contains the O–P–O radical ([PO2]-) and the P–O–P bride ([OPO]-) and approximate M–O stretching modes. Furthermore, this work reports for the first time that the change in the crystal structure of Ca2−xCuxP2O7 (i.e., bond angle of P−O−P in P2O74− and distortion phenomena in the M−O6 octahedral site) are cause the correlation between the structure, chromaticity, and dielectric properties of calcium copper pyrophosphates, Ca2−xCuxP2O7.

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Thermal decomposition kinetics of Mn0.9Co0.1HPO4·3H2O using experimental-model comparative and thermodynamic studies

Cited by 18 publications

References 54 publications

Correlation Between Structure, Chromaticity, and Dielectric Properties of Calcium Copper Pyrophosphates, Ca2−xCuxP2O7

Correlation Between Structure, Chromaticity, and Dielectric Properties of Calcium Copper Pyrophosphates, Ca2−xCuxP2O7

Preparation of Bi2Sr2CaCu2O8+δ(Bi2212) superconductor by Pechini sol–gel method: thermal decomposition and phase formation kinetics of the precursors

Correlation between structure, chromaticity, and dielectric properties of calcium copper pyrophosphates, Ca2−xCuxP2O7

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