Amorphous-crystalline transition studied in hydrated MoO<inf>3</inf>

M. A. Camacho-López, E. Haro-Poniatowski, L. Lartundo-Rojas, J. Livage, C. M. Julien

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

In this work we study the thermal behavior of hydrated MoO3 synthesized via acidification of sodium molybdate. MoO3·nH2O (n = 1.4) amorphous compound was heated in air at increasing temperatures in order to obtain the crystalline MoO3 phase. We have studied the structural changes as a function of annealing temperature by Raman spectroscopy. A statistical study to determine the average size of the crystallites at each annealing step has been realized by scanning electron microscopy. Results show that the hydrated MoO3·1.4H2O glass transforms in an amorphous MoO3·0.7H2O phase prior to its crystallization, while the sample heated at 500 °C crystallizes into the orthorhombic α-MoO3 phase with micro-crystallites having an average size of 6.8 μm. © 2006 Elsevier B.V. All rights reserved.
Original languageAmerican English
Pages (from-to)88-94
Number of pages78
JournalMaterials Science and Engineering B: Solid-State Materials for Advanced Technology
DOIs
StatePublished - 25 Nov 2006
Externally publishedYes

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Crystallites
crystallites
Annealing
Crystalline materials
annealing
Acidification
molybdates
Raman spectroscopy
Crystallization
Sodium
sodium
crystallization
Glass
Temperature
Scanning electron microscopy
scanning electron microscopy
temperature
glass
air
Air

Cite this

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title = "Amorphous-crystalline transition studied in hydrated MoO3",
abstract = "In this work we study the thermal behavior of hydrated MoO3 synthesized via acidification of sodium molybdate. MoO3·nH2O (n = 1.4) amorphous compound was heated in air at increasing temperatures in order to obtain the crystalline MoO3 phase. We have studied the structural changes as a function of annealing temperature by Raman spectroscopy. A statistical study to determine the average size of the crystallites at each annealing step has been realized by scanning electron microscopy. Results show that the hydrated MoO3·1.4H2O glass transforms in an amorphous MoO3·0.7H2O phase prior to its crystallization, while the sample heated at 500 °C crystallizes into the orthorhombic α-MoO3 phase with micro-crystallites having an average size of 6.8 μm. {\circledC} 2006 Elsevier B.V. All rights reserved.",
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Amorphous-crystalline transition studied in hydrated MoO<inf>3</inf> / Camacho-López, M. A.; Haro-Poniatowski, E.; Lartundo-Rojas, L.; Livage, J.; Julien, C. M.

In: Materials Science and Engineering B: Solid-State Materials for Advanced Technology, 25.11.2006, p. 88-94.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Amorphous-crystalline transition studied in hydrated MoO3

AU - Camacho-López, M. A.

AU - Haro-Poniatowski, E.

AU - Lartundo-Rojas, L.

AU - Livage, J.

AU - Julien, C. M.

PY - 2006/11/25

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N2 - In this work we study the thermal behavior of hydrated MoO3 synthesized via acidification of sodium molybdate. MoO3·nH2O (n = 1.4) amorphous compound was heated in air at increasing temperatures in order to obtain the crystalline MoO3 phase. We have studied the structural changes as a function of annealing temperature by Raman spectroscopy. A statistical study to determine the average size of the crystallites at each annealing step has been realized by scanning electron microscopy. Results show that the hydrated MoO3·1.4H2O glass transforms in an amorphous MoO3·0.7H2O phase prior to its crystallization, while the sample heated at 500 °C crystallizes into the orthorhombic α-MoO3 phase with micro-crystallites having an average size of 6.8 μm. © 2006 Elsevier B.V. All rights reserved.

AB - In this work we study the thermal behavior of hydrated MoO3 synthesized via acidification of sodium molybdate. MoO3·nH2O (n = 1.4) amorphous compound was heated in air at increasing temperatures in order to obtain the crystalline MoO3 phase. We have studied the structural changes as a function of annealing temperature by Raman spectroscopy. A statistical study to determine the average size of the crystallites at each annealing step has been realized by scanning electron microscopy. Results show that the hydrated MoO3·1.4H2O glass transforms in an amorphous MoO3·0.7H2O phase prior to its crystallization, while the sample heated at 500 °C crystallizes into the orthorhombic α-MoO3 phase with micro-crystallites having an average size of 6.8 μm. © 2006 Elsevier B.V. All rights reserved.

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