DE1496541B2 - TANTALOXIDE-FREE OPTICAL GLASS OF SYSTEM B DEEP 2 O DEEP 3 - LA DEEP 2 O DEEP 3 WITH THE ADDITION OF NB DEEP 2 O DEEP 5 WITH LOW DISPERSION V DEEP D = 45.9 TO 33.9 AND RELATIVELY HIGH REFRACTIVE INDEX N DEEP D = 1.817 UP TO 1.951 - Google Patents

TANTALOXIDE-FREE OPTICAL GLASS OF SYSTEM B DEEP 2 O DEEP 3 - LA DEEP 2 O DEEP 3 WITH THE ADDITION OF NB DEEP 2 O DEEP 5 WITH LOW DISPERSION V DEEP D = 45.9 TO 33.9 AND RELATIVELY HIGH REFRACTIVE INDEX N DEEP D = 1.817 UP TO 1.951

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Publication number
DE1496541B2
DE1496541B2 DE19641496541 DE1496541A DE1496541B2 DE 1496541 B2 DE1496541 B2 DE 1496541B2 DE 19641496541 DE19641496541 DE 19641496541 DE 1496541 A DE1496541 A DE 1496541A DE 1496541 B2 DE1496541 B2 DE 1496541B2
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DE
Germany
Prior art keywords
deep
refractive index
relatively high
high refractive
glasses
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
DE19641496541
Other languages
German (de)
Other versions
DE1496541C3 (en
DE1496541A1 (en
Inventor
Marga 6500 Mainz Faulstich
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schott AG
Original Assignee
Jenaer Glaswerk Schott and Gen
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DEJ17936A external-priority patent/DE1143974B/en
Application filed by Jenaer Glaswerk Schott and Gen filed Critical Jenaer Glaswerk Schott and Gen
Publication of DE1496541A1 publication Critical patent/DE1496541A1/en
Publication of DE1496541B2 publication Critical patent/DE1496541B2/en
Application granted granted Critical
Publication of DE1496541C3 publication Critical patent/DE1496541C3/en
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/12—Silica-free oxide glass compositions
    • C03C3/14—Silica-free oxide glass compositions containing boron
    • C03C3/15—Silica-free oxide glass compositions containing boron containing rare earths
    • C03C3/155—Silica-free oxide glass compositions containing boron containing rare earths containing zirconium, titanium, tantalum or niobium

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Glass Compositions (AREA)

Description

GewichtsprozentWeight percent

B2O3 15 bis 30B 2 O 3 15 to 30

La2O3 12 bis 60La 2 O 3 12 to 60

Nb2O5 4 bis 22Nb 2 O 5 4 to 22

ThO2 O bis 50ThO 2 O to 50

Zum Stand der Technik gehören La2O3-ThO2-Boratgläser mit Brechungsindizes >1,96 und hohen Gehalten an Tantaloxid und Nioboxid. Ferner sind Gläser bekannt, die frei von Nioboxid sind, aber einen hohen Gehalt an Tantaloxid aufweisen. Schließlich sind auch Gläser beschrieben, die in ihrer Zusammensetzung weder Tantaloxid noch Nioboxid enthalten. Diese Gläser besitzen aber einen niedrigen Brechungsindex und sind nur in engen Grenzen schmelzbar. Durch Einführung von Tantaloxid und Nioboxid läßt sich das Glasgebiet stark aufweiten. Auch nimmt durch diesen Zusatz der Brechungsindex höhere Werte an.The prior art includes La 2 O 3 -ThO 2 borate glasses with refractive indices> 1.96 and high contents of tantalum oxide and niobium oxide. Furthermore, glasses are known which are free from niobium oxide but have a high content of tantalum oxide. Finally, glasses are also described that contain neither tantalum oxide nor niobium oxide in their composition. However, these glasses have a low refractive index and can only be melted within narrow limits. The glass area can be greatly expanded by introducing tantalum oxide and niobium oxide. With this addition, the refractive index also takes on higher values.

Obgleich Tantaloxid die bei weitem teuerste Gemengenkomponente in diesen bekannten Gläsern ist, glaubte man bisher, auf Tantaloxid nicht verzichten zu können, um kristallisationsstabile Gläser erhalten zu können.Although tantalum oxide is by far the most expensive batch component It was previously believed that these well-known glasses contained tantalum oxide to be able to obtain crystallization-stable glasses.

Es sind auch bereits optische Gläser des Systems La2O3-B2O3 bekanntgeworden, in denen wahlweise einGehaltvonThO2, TiO2, Ta2O5 oder Nb2O5möglich ist. Diese bekannten Gläser enthalten jedoch hohe Mengen an CdO, bzw., als völligen oder partiellen Ersatz für CdO, größere Mengen an BaO.Optical glasses of the La 2 O 3 -B 2 O 3 system have also already become known in which a content of ThO 2 , TiO 2 , Ta 2 O 5 or Nb 2 O 5 is possible. However, these known glasses contain large amounts of CdO or, as a complete or partial replacement for CdO, larger amounts of BaO.

Es wurde nun überraschend gefunden, daß optische Gläser im System La2O3-B2O3 mit einem Gehalt an Nb2O5 mit geringer Dispersion und relativ hohem Brechungsindex völlig frei von Ta2O5 erschmolzen werden können.It has now surprisingly been found that optical glasses in the La 2 O 3 -B 2 O 3 system with a content of Nb 2 O 5 with low dispersion and a relatively high refractive index can be melted completely free of Ta 2 O 5.

Die erfindungsgemäßen optischen Gläser sind nioboxidhaltige Gläser des Systems B2O3-La2O3-ThO2 mit geringen Dispersionen v<ü = 45,9 bis 33,9 und relativ hohem Brechungsindex na = 1,817 bis 1,851 und sind gekennzeichnet durch folgende Zusammensetzung:The optical glasses according to the invention are nioboxide-containing glasses of the B 2 O 3 -La 2 O 3 -ThO 2 system with low dispersions v <ü = 45.9 to 33.9 and a relatively high refractive index na = 1.817 to 1.851 and are characterized by the following composition :

GewichtsprozentWeight percent

B2O3 15 bis 30B 2 O 3 15 to 30

La2O3 12 bis 60La 2 O 3 12 to 60

Nb2O5 4 bis 22Nb 2 O 5 4 to 22

ThO2 O bis 50ThO 2 O to 50

Andere Oxide, wie beispielsweise Kieselsäure und 2wertige ...Ο.χΐ3£,.. können, der Schmelze in geringen Anteilen... .zugegeben-werden. Die Gläser nach der Erfindung"Vollen- -aber Jfrei von Molybdän- und Wolframoxid hergestellt-werden.Other oxides, such as silicic acid and divalent ... Ο.χΐ3 £, .. can, the melt in small Shares ... .be admitted. The glasses after the Invention "Full - but J free of molybdenum and tungsten oxide getting produced.

In der nachfolgenden Tabelle sind Beispiele von Zusammensetzungen optischer Gläser gemäß der Erfindung aufgeführt.In the table below are examples of compositions of optical glasses according to the invention listed.

B2O3 B 2 O 3 La2O3 La 2 O 3 ThO2 ThO 2 Nb2O5 Nb 2 O 5 1,8341,834 VdVd 2525th 2727 4343 55 1,8341,834 45,645.6 2424 3939 3232 55 1,8291,829 45,645.6 20 25 20 25 3030th 4040 55 1,8231,823 45,945.9 3030th 2727 3333 1010 1,8441,844 41,941.9 2525th 2929 3636 ., 10., 10 1,8321,832 41,841.8 2626th 4747 1717th 1010 1,8491,849 42,742.7 2424 4242 2424 1010 1,8231,823 40,940.9 25 28 25 28 4141 2121 1010 1,8221,822 42,942.9 2828 5252 1010 . 10. 10 1,8661,866 43,143.1 2222nd 3737 3131 1010 1,8671,867 41,441.4 2222nd 2626th 4242 1010 1,8291,829 41,141.1 2727 5858 —- 1515th 1,8491,849 40,640.6 30 26 30 26 4040 1919th 1515th 1,8471,847 39,839.8 2525th 3030th 3030th 1515th 1,8731,873 39,339.3 2222nd 3434 2929 1515th 1,9221,922 38,338.3 1616 2929 4040 1515th 1,9051.905 36,836.8 1919th 4343 2323 1515th 1,9511.951 37,737.7 35 16 35 16 2020th 4444 2020th 1,9371.937 33,933.9 1515th 3535 3030th 2020th 1,8171.817 34,734.7 3232 4848 —- 2020th 1,9061.906 38,538.5 2020th 1515th 4545 2020th 1,8751,875 34,934.9 2424 2323 3333 2020th 1,9421,942 35,535.5 4o 17 4o 17 2626th 3737 2020th 1,9331.933 33,933.9 1717th 4141 2222nd 2020th 1,9221,922 35,035.0 1818th 5151 1111th 2020th 35,535.5

Die neuen Gläser werden in einem Platintiegel erschmolzen, bei 1400° C geläutert und anschließend bei 115O0C 20 Minuten mit einem Platinrührer gut homogenisiert. Der Guß erfolgt bei etwa HOO0C in vorgewärmte Stahlformen. Die Gläser werden anschließend langsam in einem Kühlofen abgekühlt.
Die so hergestellten Gläser sind praktisch farblos. Sie weisen nur eine geringe Kristallisationsneigung auf und besitzen eine größere Härte als Bleigläser mit gleichen Brechungsindizes.The new glasses are melted in a platinum crucible, refined at 1400 ° C and then 20 minutes at 115o homogenized 0 C with a Platinrührer. The casting takes place at about HOO 0 C in preheated steel molds. The glasses are then slowly cooled in a cooling furnace.
The glasses produced in this way are practically colorless. They have only a slight tendency to crystallize and are more hard than lead glasses with the same refractive indices.

Claims (1)

Patentanspruch:Claim: Tantaloxidfreies optisches Glas des Systems B2O3-La2O3 unter Zusatz von Nb2O5 mit geringer Dispersion va 45,9 bis 33,9 und relativ hohem Brechungsindex na 1,817 bis 1,951, gekennzeichnet durch folgende Zusammensetzung:Tantalum-free optical glass of the B 2 O 3 -La 2 O 3 system with the addition of Nb 2 O 5 with low dispersion, va 45.9 to 33.9 and a relatively high refractive index na 1.817 to 1.951, characterized by the following composition:
DE19641496541 1960-04-06 1964-07-11 Tantalum-free optical glass of the system B deep 2 O deep 3 - La deep 2 O deep 3 with the addition of Nb deep 2 O deep 5 with low dispersion v deep d = 45.9 to 33.9 and a relatively high refractive index n deep d = 1.817 to 1.951 Expired DE1496541C3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEJ17936A DE1143974B (en) 1960-04-06 1960-04-06 Optical glass
DEJ0026194 1964-07-11

Publications (3)

Publication Number Publication Date
DE1496541A1 DE1496541A1 (en) 1969-07-10
DE1496541B2 true DE1496541B2 (en) 1973-08-09
DE1496541C3 DE1496541C3 (en) 1974-03-14

Family

ID=35500516

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19641496541 Expired DE1496541C3 (en) 1960-04-06 1964-07-11 Tantalum-free optical glass of the system B deep 2 O deep 3 - La deep 2 O deep 3 with the addition of Nb deep 2 O deep 5 with low dispersion v deep d = 45.9 to 33.9 and a relatively high refractive index n deep d = 1.817 to 1.951

Country Status (1)

Country Link
DE (1) DE1496541C3 (en)

Also Published As

Publication number Publication date
DE1496541C3 (en) 1974-03-14
DE1496541A1 (en) 1969-07-10

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