Thermal expansion celsian

FIGURE 1. Linear thermal expansion ofhexacelsian and monoclinic celsian BAS. (Reprinted, from reference 12, with kind permission of Elsevier). 

Celsian. Barium feldspar, Ba0.Al203.2Si02 m.p. 1780 °C. There are two crystalline forms, resulting in a non-linear thermal expansion curve. Celsian refractory bricks have been made and have found some use in electric tunnel kilns. 

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