Effects of atmospheric humidity on the infrared reflectivity of vitreous P2O5 and ultraphosphate glasses

Meyer, K.; Barz, Andrea; Stachel, D.

doi:10.1016/0022-3093(95)00301-0

Cited by 41 publications

(35 citation statements)

References 7 publications

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“…The FTIR data taken from the sample after annealing in Fig. 8a show almost disappeared phosphate vibration bands at 1120, 1050, and 520 cm -1 and the appearance of the band at around 1290 cm -1 which can be attributed to the P=O band of anhydrous P 2 O 5 [29,30]. In Fig.…”

Section: Evolution Of the Insulation Coatings During Annealingmentioning

confidence: 89%

Investigation on sol–gel Al2O3 and hybrid phosphate-alumina insulation coatings for FeSiAl soft magnetic composites

Liu

Yan

2015

J Mater Sci

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Alumina has been prepared by sol-gel method as the coating layer in the fabrication of FeSiAl soft magnetic composites (SMCs). Influence of the Al 2 O 3 content on the magnetic properties of the SMCs has been studied, and optimized effective permeability (l e = 116.3) and core loss (P cv = 331.2 mW cm -3 ) measured at 50 kHz, 100 mT was achieved with 0.8 wt% Al 2 O 3 . Hybrid phosphate-alumina coating has also been used to prepare the FeSiAl SMCs with a total addition of 0.8 wt%. Significantly improved performance of the SMCs can be achieved with the hybrid coating compared to single phosphate or alumina coating. The addition of 0.2 wt% H 3 PO 4 and 0.6 wt% Al 2 O 3 gives rise to the optimal magnetic properties (l e = 123.4; P cv = 226.4 mW cm -3 ) of the FeSiAl SMCs. For the hybrid coating, the inner phosphate layer grown by direction reaction at the powder surfaces gives rise to excellent adhesion. Also, investigation on the thermal stability of the coatings indicates that the outer Al 2 O 3 layer hinders the decomposition of the phosphate layer, leading to enhanced magnetic performance of the SMCs.

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Section: Evolution Of the Insulation Coatings During Annealingmentioning

confidence: 89%

Investigation on sol–gel Al2O3 and hybrid phosphate-alumina insulation coatings for FeSiAl soft magnetic composites

Liu

Yan

2015

J Mater Sci

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“…The addition of alkali or alkaline earth oxides such as Na 2 O or CaO to P 2 O 5 glasses is known to result in the conversion of three dimensional network (Q 3 ), to linear phosphate chains (Q 2 ) [22][23][24]36]. This linear chain structure results in the cleavage of P-O-P linkages and creation of non-bridging oxygens in the glass.…”

Section: Thermal Investigationsmentioning

confidence: 99%

“…It has been observed by many researchers [21][22][23][24][25] that P 2 O 5 , a single component glass former is characterized by the existence of a terminal double bonded oxygen (P@O) on each network forming cation. This terminal oxygen has very short P@O double bond with a significant p-bond character that accounts for the additional valence electron.…”

Section: Infrared Spectroscopic Investigationsmentioning

confidence: 99%

Structure-property correlation in (50−x)Na2O–50P2O5–xCoCl2 glassy systems

Singh

Das

Agnihotry

2005

Journal of Non-Crystalline Solids

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“…Water molecules attacking the glass structure act as network modifiers by rupturing the P−O−P bridges. This behaviour has been demonstrated by infrared (IR) spectroscopy [2] and by 31 P magic angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy [3]. The hydrogen atoms form single covalent bonds with the terminal oxygens (O T ) and, additionally, are expected to approach another O T of a second PO 4 tetrahedron to realize hydrogen bond forming O−H···O bridges.…”

Section: Introductionmentioning

confidence: 95%

“…In order to prevent any change of the water content during melting the materials have to be prepared in sealed ampoules. Originally, this preparation method was developed to obtain anhydrous glasses with high P 2 O 5 contents [2]. Two samples with equal content of water are prepared which differ using either H 2 O or D 2 O.…”

Section: Introductionmentioning

confidence: 99%