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CTE values

The data presented for the CTE is all over the place. It is present 3 times and is different each time. Can someone come up with a value and make sure it is all correct??

KAW 73.213.29.16 ( talk) 16:59, 30 June 2015 (UTC) reply

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New Lead Section

Hi all, I’d like to propose an edit to address the “lead section may need to be rewritten” issue. This new version is more concise, and focuses on what Zerodur is, its main feature, and where it is used. The rest doesn't seem relevant for the lead section to me. The list of specific telescopes could go in the Applications section (I'll follow up on that later), and the last 3 sentences ("Although it has advantages ...") lack a citation, so I've removed them.

Old lead section

Zerodur [1] is a lithium- aluminosilicate glass-ceramic [2] produced by Schott AG since 1968. [3] It has been used for a number of very large telescope mirrors including GTC, Keck I, Keck II, [4] and SOFIA, as well as some smaller telescopes (such as the GREGOR Solar Telescope). With its low coefficient of thermal expansion (CTE), it is suitable for producing mirrors that maintain acceptable figures in extremely cold environments, such as deep space. [5] Although it has advantages for applications requiring a coefficient of thermal expansion less than that of borosilicate glass, it remains very expensive as compared to borosilicate. The tight tolerance on CTE, ±0.007×10−6 K−1, allows for its use in high-precision applications.

References

  1. ^ "Zerodur®". Archived from the original on July 24, 2011. Retrieved September 4, 2011.
  2. ^ Viens, Michael J (April 1990). "Fracture Toughness and Crack Growth of Zerodur" (PDF). NASA Technical Memorandum 4185. NASA. Retrieved 28 August 2011.
  3. ^ "Schott AG Zerodur description". Archived from the original on February 1, 2014.
  4. ^ Döhring, Thorsten; Peter Hartmann; Ralf Jedamzik; Armin Thomas; Frank-Thomas Lentes. "Properties of Zerodur Mirror Blanks for Extremely Large Telescopes" (PDF). Proc. SPIE. SPIE. Retrieved 26 August 2011. (dead link 7 July 2020)
  5. ^ Baer, JW; WP Lotz. "Figure testing of 300 mm Zerodur mirrors at cryogenic temperatures" (PDF). Retrieved 26 August 2011.
New lead section

Zerodur is a lithium- aluminosilicate glass-ceramic manufactured by Schott AG. Zerodur has a near zero coefficient of thermal expansion (CTE), and is used for high-precision applications in telescope optics, microlithography machines and inertial navigation systems. [1] [2] [3]

References

  1. ^ "Zerodur®". Archived from the original on July 24, 2011. Retrieved September 4, 2011.
  2. ^ Viens, Michael J (April 1990). "Fracture Toughness and Crack Growth of Zerodur" (PDF). NASA Technical Memorandum 4185. NASA. Retrieved 28 August 2011.
  3. ^ "Schott AG Zerodur description". Archived from the original on February 1, 2014.

Thanks for your consideration, and let me know if you have any feedback! Elisabeth at SCHOTT ( talk) 12:25, 10 July 2024 (UTC) reply

 Done Thank you for going through the COI request process! Feel free to tag me when re-adding the specific telescopes, I can't guarantee I'll get to it but I'll try to take a look. Rusalkii ( talk) 20:54, 11 July 2024 (UTC) reply
@ Rusalkii, thank you for your quick review! I just wanted to let you know that I've added the expanded Applications section where I've added back in some telescope examples, among others. See below. Regards, Elisabeth at SCHOTT ( talk) 13:35, 12 July 2024 (UTC) reply

Revised Properties Section

Hi all, I’d like to propose some changes to address the “written like an advertisement” issue. I am not entirely sure what the user's issue with the article was, but I presume it is refering to some "better than" comparsions to other materials and products, mentioned in the Properties section. To improve the neutrality of the article, I'm proposing a version that removes those superiority claims. Thanks for taking a look at this proposal, and let me know if you have any input or other thoughts! Elisabeth at SCHOTT ( talk) 12:40, 10 July 2024 (UTC) reply

−
== Properties ==

Zerodur has both an [[amorphous]] (vitreous) component and a [[crystalline]] component. Its most important properties are: * The material exhibits a particularly low thermal expansion, with a mean value of 0 ± 0.007×10<sup>−6</sup> K<sup>−1</sup> within the temperature range of 0 to 50 °C. This thermal expansion performance is comparatively superior to [[Fused quartz#List of physical properties|that of fused quartz]] by two orders of magnitude. * High 3D [[Homogeneity (physics)|homogeneity]] with few inclusions, bubbles and internal stria (as contrasted to [[Cer-Vit]]). * Hardness similar to that of [[borosilicate glass]], so that it can be ground and polished more easily than [[fused quartz]]. * High affinity for [[Optical coating|coatings]]. * Low [[helium]] permeability. * Non-porous (as contrasted to [[sintered]] ceramics). * Good chemical stability similar to that of [[fused quartz]].

* [[Fracture toughness]] approximately 0.9 MPa·m<sup>1/2</sup>.
+
== Properties ==

Zerodur has both an [[amorphous]] (vitreous) component and a [[crystalline]] component. Its most important properties are: * The material exhibits a particularly low thermal expansion, with a mean value of 0 ± 0.007×10<sup>−6</sup> K<sup>−1</sup> within the temperature range of 0 to 50 °C. * High 3D [[Homogeneity (physics)|homogeneity]] with few inclusions, bubbles and internal stria. * Hardness similar to that of [[borosilicate glass]]. * High affinity for [[Optical coating|coatings]]. * Low [[helium]] permeability. * Non-porous. * Good chemical stability.

* [[Fracture toughness]] approximately 0.9 MPa·m<sup>1/2</sup>.

Elisabeth at SCHOTT ( talk) 12:40, 10 July 2024 (UTC) reply

References

  1. ^ a b "ZERODUR® Extremely Low Expansion Glass Ceramic: SCHOTT Advanced Optics - SCHOTT AG". www.schott.com. Retrieved 15 April 2018.
  2. ^ "SCHOTT CTE Grades". Archived from the original on October 4, 2013.
  3. ^ a b c d [1] dead link
  4. ^ a b Cite error: The named reference Viens1 was invoked but never defined (see the help page).
  5. ^ a b Hartmann, P. (18 December 2012). "ZERODUR - Deterministic Approach for Strength Design" (PDF). Optical Engineering. 51 (12). NASA: 124002. Bibcode: 2012OptEn..51l4002H. doi: 10.1117/1.OE.51.12.124002. S2CID  120843972. Retrieved 11 September 2013.
  6. ^ "SCHOTT CTE Grades". Archived from the original on October 4, 2013.
 Done @ Elisabeth at SCHOTT, thank you for going through the COI edit process. Rusalkii ( talk) 20:42, 11 July 2024 (UTC) reply

Revised Applications Section

Hi all, I've drafted a new version of the section, in which I've expanded on the application areas including some relevant examples, e.g., the telescopes that I previously removed when I shortened the lead section (see above). Thank you very much for your review! -- Elisabeth at SCHOTT ( talk) 13:31, 12 July 2024 (UTC) reply

Proposed Version for Applications

The Keck II Telescope showing the segmented primary mirror made of Zerodur

The main applications for Zerodur include telescope optics in astronomy [1] and space applications, [2] lithography machines for microchips and displays, [3] and inertial measurements systems for navigation. [4] [5]

In astronomy, it is used for mirror substrates in large telescopes such as the Hobby-Eberly Telescope, [6] the Keck I and Keck II telescopes, [7] the Gran Telescopio Canarias, [8] the Devasthal Optical Telescope, [9] the European Southern Observatory's 8.2 m Very Large Telescope, [10] and the 39 m Extremely Large Telescope. [11]

In space, it has been used for the primary mirror of SOFIA’s telescope, [12] for the imager in Meteosat Earth observation satellites, [13] and for the optical bench in the LISA Pathfinder mission. [14]

In microlithography, Zerodur is used in wafer steppers and scanner machines for precise and reproducible wafer positioning. [15] [16] It is also used as a mirror substrate material in refractive optics for EUV lithography. [17]

In inertial measurement units, Zerodur is used in ring laser gyroscopes. [18]

References

  1. ^ Döhring, Thorsten (May 2019). "Four decades of ZERODUR mirror substrates for astronomy". Proceedings, 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes. 7281. doi: 10.1117/12.831423. Retrieved 10 May 2024.
  2. ^ Carré, Antoine (May 2023). "Comprehensive review of the effects of ionizing radiations on the ZERODUR® glass ceramic". Journal of Astronomical Telescopes, Instruments, and Systems. 9 (2). doi: 10.1117/1.JATIS.9.2.024005. Retrieved 10 May 2024.
  3. ^ "SCHOTT Strengthens Glass Substrate Portfolio". Printed Electronics Now. September 29, 2023.
  4. ^ Sokach, Stephen. "ZERODUR: The Highly Technical Glass-Ceramic". Tech Briefs. Retrieved 10 May 2024.
  5. ^ "Zerodur". Mindrum Precision. Retrieved 10 May 2024.
  6. ^ "Hobby-Eberly Telescope | McDonald Observatory". mcdonaldobservatory.org. Retrieved 2024-07-12.
  7. ^ "A Mirror's Perfect Reflection". W.M. Keck Observatory. Retrieved 10 May 2024.
  8. ^ "Description of the GTC". Gran Telescopio CANARIAS. Retrieved 10 May 2024.
  9. ^ "3.6 m DOT Telescope". ARIES. Retrieved July 7, 2024.
  10. ^ "Very Large Telescope". ESO. Retrieved 10 May 2024.
  11. ^ "Mirrors and Optical Design". ESO. Retrieved 10 May 2024.
  12. ^ Krabbe, Alfred (June 2000). "SOFIA telescope". Proceedings, Airborne Telescope Systems. 4014. doi: 10.1117/12.389103. Retrieved 10 May 2024.
  13. ^ "MTG (Meteosat Third Generation) - eoPortal". www.eoportal.org. Retrieved 2024-07-12.
  14. ^ "LISA Technology Package Optical Bench Interferometer During Calibration". ESA. Retrieved 10 May 2024.
  15. ^ Hartmann, Peter. "SCHOTT – Ultra low expansion glass ceramic ZERODUR" (PDF). Max-Planck-Institut für Astronomie. p. 49. Retrieved 10 May 2024.
  16. ^ Jedamzik, Ralf (2014). "Glass ceramic ZERODUR enabling nanometer precision". Proceedings, Optical Microlithography XXVII. 9052. doi: 10.1117/12.2046352. Retrieved 10 May 2024.
  17. ^ Mitra, Ina (September 2022). "ZERODUR: a glass-ceramic material enabling optical technologies". Optical Materials Express. 12 (9): 3563. doi: 10.1364/OME.460265. Retrieved 10 May 2024.
  18. ^ Pinckney, Linda R. (2003). "Glass-Ceramics". Encyclopedia of Physical Science and Technology (Third Edition): 807–816. doi: 10.1016/B0-12-227410-5/00293-3. Retrieved 10 May 2024.

Elisabeth at SCHOTT ( talk) 13:31, 12 July 2024 (UTC) reply

 Done , for future reference you want to use the {{talk ref}} template to consolidate references from one talk page section. I've edited this and the above section to use it. Rusalkii ( talk) 22:01, 12 July 2024 (UTC) reply
Retrieved from " https://en.wikipedia.org/?title=Talk:Zerodur&oldid=1234160494"

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