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In this study, nine phosphate‐based glass formulations from the system P2O5‐CaO‐Na2O‐MgO‐B2O3 were prepared with P2O5 content fixed as 40, 45 and 50 mol%, where Na2O was replaced by 5 and 10 mol% B2O3 and MgO and CaO were fixed to 24 and 16 mol%, respectively. The effect of B2O3 addition on the viscosity‐temperature behaviour, fragility index and structure of the glasses was investigated. The composition...
Reported for the first time from the Sydney Coalfield, Canada, is a fragmentary fusain (R o =2.51%) specimen, 41cm long, of a medullosalean trunk or massive petiole that originated from the roof rocks of the banded bituminous Hub Seam (R o ∼0.65%). Megascopic characteristics of the flat-preserved specimen include an irregular-cracked fusain surface with secretinite–rodlet structures...
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