β-MoO3 produced from a novel freeze drying route

Parise, John B.; McCarron, E.M.; Dreele, R. Von; Goldstone, J. A.

doi:10.1016/0022-4596(91)90288-s

Cited by 97 publications

(61 citation statements)

References 5 publications

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“…b-MoO 3 is a metastable phase. It possesses a ReO 3 -related structure with corner-sharing MoO 6 octahedra [6]. The hexagonal structure is also a metastable phase.…”

mentioning

confidence: 99%

Raman studies of hexagonal MoO₃ at high pressure

Zhang¹,

Zheng²,

Zhang³

et al. 2011

Physica Status Solidi (b)

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The transition-metal oxide MoO 3 is an important semiconductor and has various technological applications in catalysts, electrochromic and photochromic devices, gas sensors, and battery electrodes. In this study, the hexagonal MoO 3 prepared by a hydrothermal method is in morphology of microrod with diameter of 0.8-1.2 mm and length of 2.0-4.3 mm. Its structural stability was investigated by an in situ Raman scattering method in a diamond anvil cell up to 28.7 GPa at room temperature. The new Raman peak around 1000 cm À1 implies that a phase transition from hexagonal to amorphous starts at 5.6 GPa, and the evolution of the Raman spectra indicates that the structural transition is completed at about 13.2 GPa. After releasing pressure to ambient condition, the Raman spectrum pattern of the high pressure phase was retained, revealing that the phase transition is irreversible.

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“…b-MoO 3 is a metastable phase. It possesses a ReO 3 -related structure with corner-sharing MoO 6 octahedra [6]. The hexagonal structure is also a metastable phase.…”

mentioning

confidence: 99%

Raman studies of hexagonal MoO₃ at high pressure

Zhang¹,

Zheng²,

Zhang³

et al. 2011

Physica Status Solidi (b)

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“…It is important to note that the formation of metallic Ni(s) is a result of two reactions, (5.27) and (5.30), and that this could be the reason for a formation of MoNi 4 phase during complete reduction of both metal ions by reactions (5.27)- (5.29). Of course, it should be stated here that the most probable mechanism proposed by is valid for the deposition of compact deposits from citrate containing solution (although there is an indication for the presence of oxygen in the compact deposits too [152][153][154]), while we were investigating powder electrodeposition from different ammonium sulfate solution. On the other side, it seems reasonable to assume that the electrodeposition mechanism does not depend on the potential (current) and that it should be the same for the deposition of compact and powderous deposits.…”

Section: The Tem Analysis Of Electrodeposited Ni-rich Mo-ni-o Powdersmentioning

confidence: 94%

“…The SAED pattern (shown in Fig. 5.62b) from these clusters best corresponds to the monoclinic MoO 3 phase (JCPDF # 89-1554) [153], or one of its structural variants, depending on the position in the sample. Typical morphology of euhedral MoO 3 crystals is shown in Fig.…”

Section: The Tem Analysis Of Electrodeposited Ni-rich Mo-ni-o Powdersmentioning

confidence: 99%

Morphology, Chemical, and Phase Composition of Electrodeposited Co–Ni, Fe–Ni, and Mo–Ni–O Powders

Jović

Lačnjevac

Jović

2012

Modern Aspects of Electrochemistry

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The alloy powders of the iron-group metals are of great interest for many industrial applications .Ultrafine Co-Ni powders showed significant promise for future development of hard materials [1,2], magnetic materials [3][4][5], commercial batteries [6], catalysts [7][8][9], catalyzing electroplates [10,11], hydrogen absorbing alloy anodes [12], and magnetoresistive sensors [13,14]. The powders for these applications were made by several different techniques such as mechanical alloying-ball milling [15,16], sonochemical synthesis [17][18][19], chemical reduction [13,14,[20][21][22][23], synthesis in microemulsion [24,25]

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“…Nesse contexto o estudo sobre o MoO 3 vem atraindo cada vez mais a atenção de pesquisadores em virtude de sua variedade de estruturas, características físico-químicas e seu leque de aplicações, no qual se destaca o uso em catálise [11], baterias [12], sensores de gás [13], tecnologias para dispositivos eletrocrômicos [14,15] e fotodegradação [16]. O MoO 3 é conhecido por apresentar vários polimorfos, que são divididos em cinco fases: uma fase ortorrômbica α-MoO 3 termodinamicamente estável [17], quatro fases metaestáveis, sendo três monoclínicas β-MoO 3 [18], MoO 3 -II [19] e MoO 3 -III [20], e uma hexagonal h-MoO 3 , além das fases de MoO 3 hidratadas, com fórmula geral MoO 3 .nH 2 O. A obtenção da fase particular do óxido de molibdênio micro e nanoestruturado é altamente dependente do processo de síntese e das condições de crescimento [21].…”

Section: Introductionunclassified

Síntese, caracterização e aplicação do trióxido de molibdênio na fotocatálise de efluente têxtil sintético

Silva

Matos

2018

Cerâmica

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ResumoNeste estudo o trióxido de molibdênio (MoO 3 ) foi sintetizado pelo método hidrotérmico com temperatura fixa em 180 ºC nos tempos de 1 e 6 h, seguido de tratamento térmico por 6 e 12 h a 300, 450 e 600 ºC. A fase cristalina e as propriedades estruturais da amostra foram caracterizadas pelo método de difração de raios X. O comportamento vibracional das ligações químicas foi verificado por espectroscopias na região do infravermelho e Raman, em que as bandas e picos observados confirmaram a formação do MoO 3 . A microscopia eletrônica de varredura mostrou a formação de microestruturas da fase hexagonal (h-MoO 3 ) e ortorrômbica (α-MoO 3 ) do MoO 3 . Além disso, as propriedades de absorção óptica foram medidas por espectroscopia de reflectância difusa e os valores de energia de gap foram estimados no intervalo de 2,74 a 3,33 eV a partir da função Kubelka-Munk. Os óxidos calcinados a 600 ºC foram os que apresentaram a melhor atividade fotocatalítica, degradando 50% do corante em 2 h de reação. Palavras-chaves: efluente sintético, fotocatálise, trióxido de molibdênio. Abstract In this study, the molybdenum trioxide (MoO

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β-MoO3 produced from a novel freeze drying route

Cited by 97 publications

References 5 publications

Raman studies of hexagonal MoO₃ at high pressure

Raman studies of hexagonal MoO₃ at high pressure

Morphology, Chemical, and Phase Composition of Electrodeposited Co–Ni, Fe–Ni, and Mo–Ni–O Powders

Síntese, caracterização e aplicação do trióxido de molibdênio na fotocatálise de efluente têxtil sintético

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β-MoO3 produced from a novel freeze drying route

Cited by 97 publications

References 5 publications

Raman studies of hexagonal MoO3 at high pressure

Raman studies of hexagonal MoO3 at high pressure

Morphology, Chemical, and Phase Composition of Electrodeposited Co–Ni, Fe–Ni, and Mo–Ni–O Powders

Síntese, caracterização e aplicação do trióxido de molibdênio na fotocatálise de efluente têxtil sintético

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Raman studies of hexagonal MoO₃ at high pressure

Raman studies of hexagonal MoO₃ at high pressure