Infrared spectra of the crystalline inorganic borates

Weir, C. E.; Schroeder, R. A.

doi:10.6028/jres.068a.045

Cited by 229 publications

(115 citation statements)

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“…All the more rece nt s tudies, however, extend as far as 400 e m-I. 1 Figures in brackets indicate th e lit e rat ure references at th e e nd of this paper.…”

Section: Introductionmentioning

confidence: 89%

“…Experimental techniques and equipment were similar to those described previously for the anhydrous borates [1]. A double-beam grating spectrometer was used to cover the range 4000-200 em -I.…”

Section: Experimental Methods and Apparatusmentioning

confidence: 99%

“…Data will be presented here as in the previous report [1]. Compounds are grouped according to the anion type expected based on the ideas presented by Christ [16].…”

Section: Presentation Of Datamentioning

confidence: 99%

“…Pinnoite contains anions of the form [B(OH):;OB(OHh]-2 which can be considered as resulting from condensing two B(OH):;-I groups with the elimination of H20 [22]. It is of interest to compare the spectra of these substances with those obtained in previous studies of the anhydrous borates [1] where it was found that boron in three-fold coordination could be differe ntiated by the strong ab sorption d erived from V3 of th e isolated ion s whi c h ge nerally persis ted in th e co mplex ani on. It was found tha t trian gular boron e ve n in complex anion s e xhibited broad stron g ab sorpti on in th e region 110G-1300 e m-I and te trah edral boron in th e region 80G-1100 e m -I.…”

Section: Borates With Simple Anionsmentioning

confidence: 99%

“…A comprehensive s urvey of the infrared spectra of the crystalline anhydrous inorgani c borates was reported recently [1].1 The spectra were correlated with known structures and predictions of unknown structures were made on th e basis of the observed spectra. Two of the predicted anion stru c tures have been verified by sub sequent x-ray crystallograp hic studies [2,3].…”

Section: Introductionmentioning

confidence: 99%

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Infrared spectra of the hydrated borates

Weir

1966

J. RES. NATL. BUR. STAN. SECT. A.

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103

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Infrare d absorption spectra of 42 diffe rent hydrated borates were obtained in the 2000-300 em -I range. A few spec tra were obtained between 4000 a nd 2000 em-I. Most spectra are complex and cannot be interpreted sati sfactorily except in the case of the simp lest an ions. Many correlatIOns be twee n spectra are possible, however, and possible anion types have been deduced. Differentiation be twee n triangular a nd tetrah e dral boron is possible on th e basis of th e spectra but IS less certain than in th e case of th e anhydrous borates.

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“…All the more rece nt s tudies, however, extend as far as 400 e m-I. 1 Figures in brackets indicate th e lit e rat ure references at th e e nd of this paper.…”

Section: Introductionmentioning

confidence: 89%

Section: Experimental Methods and Apparatusmentioning

confidence: 99%

“…Data will be presented here as in the previous report [1]. Compounds are grouped according to the anion type expected based on the ideas presented by Christ [16].…”

Section: Presentation Of Datamentioning

confidence: 99%

Section: Borates With Simple Anionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Infrared spectra of the hydrated borates

Weir

1966

J. RES. NATL. BUR. STAN. SECT. A.

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103

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Foaming Species and Trapping Mechanisms in Barium Silicate Glass Sealants

et al. 2021

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Glass powders are widely used in fabricating sintered glasses, sintered glassÀceramics, glass matrix composites, seals, and glass-bonded ceramics or pastes. [1][2][3] For many of these applications, glasses with low crystallization tendency are used, for example, for low-temperature cofired ceramics, [4,5] pastes, [6] or sealants [7,8] to ensure sufficient sinterability.Due to the low viscosity required for joining and gas tight sealing, gas bubble formation and subsequent swelling (foaming) often occur, even when organic aids are not used in powder processing. In contrast to the extensive and ongoing study of desired foaming phenomena utilized for foam glasses or glassÀceramic foams, [9][10][11][12][13][14][15] this nondesired foaming effect and its underlying mechanisms are rarely reported. Lucchini [16] observed bubble formation for sodium and calcium lead silicate glass-bonded barium hexaferrites and discussed glass volatilization as the underlying mechanism. Pore formation was also found in porcelain stoneware tiles [17] and lead borosilicate glass frits, [18] where effusing oxygen or water, physically or chemically adsorbed to the powder surface, was discussed as the foaming source. Lara et al. [19] reported foaming during the sintering and crystallization of Ca, Mg, and Zn alumosilicate glass powders used for solid oxide fuel cell (SOFC) sealing. The authors believed that density changes or gas evolution during crystallization are responsible for foaming. Undesired porosity was also reported to occur during sintering of BaO-B 2 O 3 -SiO 2 , [20] lead-free Bi 2 O 3 -B 2 O 3 -SiO 2 solder glass, [21] LTCC glass powders; [22] as well as during porcelain tiles production. [23] More recently, Agea-Blanco et al. [24] studied sintering and foaming of commercial barium zinc alumino boro silicate glass powders, used for SOFC sealing, with heating microscopy, differential thermal analysis (DTA), and vacuum hot extraction (VHE). It was shown that foaming intensity increases with milling duration. For moderately milled glass powders, consecutive storage in air could also promote foaming. Although powder compacts were pressed and sintered in air, foaming was affected by different milling atmospheres among which CO 2 proved to enhance foaming most strongly. Similarly, VHE studies revealed that foaming is predominantly driven by C, CO, and CO 2 , even for powders milled in Ar and N 2 . It was therefore concluded that foaming is caused by carbonaceous species adsorbed on the glass powder surface during milling and later storage.The present study is focused on the nature of these species and the mechanisms keeping them trapped during heating to the temperature of foaming. To ensure detectable amounts of foaming species, K01 glass powders were milled for several hours. Recrushed powder compacts, or those heated to different temperatures and quenched in air were studied with heating

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Bildung kantenverknüpfter BO₄‐Tetraeder im Hochdruckborat HP‐NiB₂O₄

et al. 2007

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[11][12][13] b-RE 2 B 4 O 9 (RE = Gd, Dy) [14,15] und Pr 4 B 10 O 21 , [16] für die bisher keine entsprechenden Normaldruckmodifikationen bekannt sind. Zu unserer Überra-schung zeigten die Borate RE 4 B 6 O 15 (RE = Dy, Ho) [8][9][10] neben eckenverknüpften BO 4 -Tetraedern erstmals das Strukturmotiv kantenverknüpfter BO 4 -Tetraeder, das bis dahin in der variantenreichen Strukturchemie der Borate fehlte. Im Verlauf unserer Arbeiten entdeckten wir einen zweiten Strukturtyp, a-RE 2 B 4 O 9 (RE = Sm-Ho), [11][12][13] der ebenfalls dieses neue Strukturmotiv aufweist. Hier berichten wir nun erstmals über die Synthese und Charakterisierung eines

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Infrared spectra of the crystalline inorganic borates

Cited by 229 publications

References 4 publications

Infrared spectra of the hydrated borates

Infrared spectra of the hydrated borates

Foaming Species and Trapping Mechanisms in Barium Silicate Glass Sealants

Bildung kantenverknüpfter BO₄‐Tetraeder im Hochdruckborat HP‐NiB₂O₄

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Infrared spectra of the crystalline inorganic borates

Cited by 229 publications

References 4 publications

Infrared spectra of the hydrated borates

Infrared spectra of the hydrated borates

Foaming Species and Trapping Mechanisms in Barium Silicate Glass Sealants

Bildung kantenverknüpfter BO4‐Tetraeder im Hochdruckborat HP‐NiB2O4

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Bildung kantenverknüpfter BO₄‐Tetraeder im Hochdruckborat HP‐NiB₂O₄