The system BaO-B2O3

Levin, Ernest M.; McMurdie, Howard F.

doi:10.6028/jres.042.011

Cited by 77 publications

(51 citation statements)

References 6 publications

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“…tained or: .a series of B aO-B20 a glasses for ch emlCal durabilIty, hygroscopicity, and pH resp01?-s.e. This serics of gl assc~ extends over t he composltlOn r ange 29.6 p er cent of B aO wh ere two immiscible layers appear [9], to n ear 60 l;ercen t of B aO, above which devitrification limits t he glass-m aking r ange. Figure 7 illustr ates th e extr emes of chemical dur ability over t he r ange pH 2 to pH 11 .S exhibited by these gla~ses.…”

Section: Selid S C1issoh'ec1mentioning

confidence: 88%

Atypical pH response of some nonsilicate glasses

Shermer¹,

Rynders²,

Cleek³

et al. 1954

J. RES. NATL. BUR. STAN.

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It is ge nerally believed that a glass, in order to yield electrodes whose voltage characte ristics serve as a satisfactor y indicator of t he hydroge n-ion activity of aqueous solutions in accord with the dictates of the N ernst equation , m ust possess at least a minimum hygroscopic ity and an adequate chemical durability, uniform over an extended pH ran ge. Th ree series of llons ili cate glasses, Na20-MgO-P20 s, Na20-GeO, and BaO-B. 0 3, were investigated for t hese t hree properties. In accord wi th the fact t hat all of t he m embers of t hese series ex hibited very poor chem ical durabi lity and man y of t he m possessed very low h ygroscop icity, none of t he m produced elect rodes t ha t had a satisfa ctory pH response. A. ll of the ser ies co nfirmed t he generally accepted fac t t hat hygroscopicity cannot be d irectly co rrelated with chem ical durab ili ty of glasses. For example, some members of t he BaO-B20 3 se ries possessed h yg roscopic propert ies that co mpared favora bl y with Pyrex 7740, yet had unus uall y poor che mical dura bili ty.

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Section: Selid S C1issoh'ec1mentioning

confidence: 88%

Atypical pH response of some nonsilicate glasses

Shermer¹,

Rynders²,

Cleek³

et al. 1954

J. RES. NATL. BUR. STAN.

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“…Area of glass formation from both these areas moves to eutectic areas e 1 (16,5 mol% BaO) with m.p. 878°C [Levin & McMurdie, 1949;Levin & Ugrinic, 1953] and ~ 31.5 mol%B 2 O 3 content compositions in the binary BaO-B 2 O 3 system and includes Ba 2 B 2 O 5 and BaB 2 O 4 compositions ( Fig.2-1). The transparent glass tapes have been obtained firstly for Ba 3 Ti 3 B 2 O 12 (3Ba3TB) composition by its melt high cooling rate (10 3 -10 4 ) K /s ( Fig.2-1).…”

Section: Methodsmentioning

confidence: 99%

“…First of all we have deleted eutectic point e 1 , which has been for the first time wrongly put by Levin with co-workers on the binary BaO-B 2 O 3 diagram [Levin & McMurdie, 1949;Levin & Ugrinic, 1953], and then is repeated in our recent publications [Hovhannisyan, R. et al, 2008, Hovhannisyan, M. et al, 2009. Such imperfect data very often committed many authors first of all at binary borate system diagram constructions [ACerS & NIST, 2004].…”

Section: Phase Diagram Of the Bao-tio 2 -B 2 O 3 Ternary Systemmentioning

confidence: 99%

“…Levin with co-authors have studied the BaO-B 2 O 3 system and constructed its melting diagram. They discovered four Ba 3 B 2 O 6 (3BaB), BaB 2 O 4 (BaB), BaB 4 O 7 (Ba2B) and BaB 8 O 13 (Ba4B) compounds [Levin & McMurdie, 1949;Levin & Ugrinic, 1953]. Hubner synthesized three new Ba 4 B 2 O 6 (4BaB), Ba 2 B 2 O 5 (2BaB) and Ba 2 B 10 O 17 (2Ba5B) compounds [Hubner, 1969].…”

Section: Introductionmentioning

confidence: 99%

“…Hubner synthesized three new Ba 4 B 2 O 6 (4BaB), Ba 2 B 2 O 5 (2BaB) and Ba 2 B 10 O 17 (2Ba5B) compounds [Hubner, 1969]. However, these compounds are not visible on the BaO-B 2 O 3 systems diagram constructed earlier by Levin with co-authors [Levin & McMurdie, 1949;Levin & Ugrinic, 1953]. Pavlikov with co-authors have studied the TiO 2 -B 2 O 3 system and didn't reveal binary compounds in it [Pavlikov et al, 1976].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Phase Diagramm, Cristallization Behavior and Ferroelectric Properties of Stoichiometric Glass Ceramics in the BaO-TiO2-B2O3 System

Hovhannisyan¹,

Alexanyan²,

Hovhannisyan³

et al. 2011

Ferroelectrics - Physical Effects

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Theoretical Basis for the Development of Borate Nonlinear Optical Crystals

Chen

Sasaki

et al. 2012

Nonlinear Optical Borate Crystals

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Today, we have confidence to say that the discovery of borate series NLO crystals is inseparable from the theoretical understanding of the relationship between the macroscopic NLO and LO properties of the NLO crystals and their microscopic structures. If we had not done a lot of calculations for SHG coefficients of the known NLO crystals and suggested the anionic group theory from the mid-1960s to the end of 1970s, it was nearly impossible to discover the borate NLO crystals in the 1980s. Therefore, this chapter describes the basic concepts and an approximation calculation method for the anionic group theory of NLO effect in crystals, and furthermore, use the model to elucidate the relationship between the macroscopic NLO and LO properties of NLO crystals and their microscopic structures, anionic group structures in particular. Moreover, we have also employed the first-principles method to study the NLO effects and elucidated their microscopic structural origins. On the basis of the theoretical understanding, the processes leading to the discovery of the borate series NLO crystals are further described.In Section 2.1, the basic concepts and calculation method of the anionic group theory of NLO effects in crystals are described with emphasis on the basic idea and the degree of approximation of the theory. In Section 2.2, several typical examples of the principal NLO crystals are given to explain that the major structural units of the NLO crystals to produce SHG effect on the crystals are certainly anionic groups and the contributions of cations in the crystals to the SHG effect can be ignored in the first approximation. In Section 2.3, a DV-SCM-X a localized cluster calculation method is employed to calculate the energy-level structure of the anionic groups in the NLO crystals. From the calculations one can understand the relationship between the energy-level structure of the anionic groups and absorption edge of the NLO crystals. The understanding is very helpful for the molecular engineering approach to search for UV and deep-UV NLO crystals. In Section 2.4, a first-principles calculation method with a plane wave pseudopotential (PWPP) total energy package is used to calculate the refractive indices, SHG coefficients of the NLO crystals, and then a realspace atom-cutting technique is employed to analyze the effect of cations on the SHG coefficients in the NLO crystals and determine the approximation degree of the anionic group theory. In Section 2.5, a computer-assisted molecular design system is introduced, in which the theoretical calculations and experimental methods are Nonlinear Optical Borate Crystals: Principles and Applications, First Edition.

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The system BaO-B2O3

Cited by 77 publications

References 6 publications

Atypical pH response of some nonsilicate glasses

Atypical pH response of some nonsilicate glasses

Phase Diagramm, Cristallization Behavior and Ferroelectric Properties of Stoichiometric Glass Ceramics in the BaO-TiO2-B2O3 System

Theoretical Basis for the Development of Borate Nonlinear Optical Crystals

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