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Hematite pigment has a long history, but it cannot be used for ceramic application, because it must be thermally and chemically stable at high firing temperature when using a pigment in a glaze or ceramic body. Recently, through encapsulated systems, a new pigment with suitable thermal and chemical stability can be obtained by encapsulating hematite crystals into selected silica or zircon matrices. It means that nano-sized red hematite has been encapsulated into the protected phases. Transmission electron micrographs of hematite encapsulated into silica and zircon matrices by sol–gel method show spherical single crystals with diameter of about 5–10 nm. In order to optimize ceramic glaze formulations for application of the synthesized red inorganic nanocomposite inclusion pigment by sol–gel method, four different types of glazes (i.e., alkalis, borate, earth alkalis, and leaded glazes) have been tested. The results show that the substitution of a fraction of zircon by cristobalite in hematite-zircon pigment produces acceptable stability with red hue.


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Substitution of a fraction of zircon by cristobalite in nano hematite encapsulated pigment and examination of glaze application

Show Author's information Maryam HOSSEINI-ZORI*( )
Department of Inorganic Pigments and Glazes, Institute for Color Science and Technology (ICST), P.O. Box 1668814811, Tehran, Iran

Abstract

Hematite pigment has a long history, but it cannot be used for ceramic application, because it must be thermally and chemically stable at high firing temperature when using a pigment in a glaze or ceramic body. Recently, through encapsulated systems, a new pigment with suitable thermal and chemical stability can be obtained by encapsulating hematite crystals into selected silica or zircon matrices. It means that nano-sized red hematite has been encapsulated into the protected phases. Transmission electron micrographs of hematite encapsulated into silica and zircon matrices by sol–gel method show spherical single crystals with diameter of about 5–10 nm. In order to optimize ceramic glaze formulations for application of the synthesized red inorganic nanocomposite inclusion pigment by sol–gel method, four different types of glazes (i.e., alkalis, borate, earth alkalis, and leaded glazes) have been tested. The results show that the substitution of a fraction of zircon by cristobalite in hematite-zircon pigment produces acceptable stability with red hue.

Keywords:

nano hematite, inclusion pigment, zircon, silica, ceramic glaze
Received: 14 January 2013 Revised: 24 February 2013 Accepted: 14 March 2013 Published: 04 June 2013 Issue date: June 2013
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Publication history
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Publication history

Received: 14 January 2013
Revised: 24 February 2013
Accepted: 14 March 2013
Published: 04 June 2013
Issue date: June 2013

Copyright

© The author(s) 2013

Acknowledgements

We are grateful to Mashad Glaze Industrial Group for the provision of the glazes used.

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Open Access: This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.

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