B₂FeO₆W

Architectural potential

A boron-iron-tungsten heavy-oxide ceramic fired at 1250 °C, carrying 100 MPa of compression and the same voltage-switchable tungstate behaviour as its lanthanum-manganese sibling. The CO₂ runs at more than four times that of a fired clay brick, so the function has to pay for the fire. What the chemistry opens is a monolithic, wiring-ready dimmable surface — a small DC signal shifts the body's optical transmission measurably, closing down solar gain without mechanical louvres. Natural placements are responsive accent tiles in south-facing office partitions, switchable signage panels in exhibition architecture where the curator dims the tile from the gallery console, electrochromic border tiles around skylight perimeters, and amber-bodied sill inserts in double-skin façades where the thermal argument and the dimming argument are wanted together. The amber-brown body sits warmer than the purple-brown La-Mn sibling, which positions it for programmes where the resting colour is part of the design rather than an engineering side-effect. At 200 g per batch and a 500 g workshop ceiling, specification is firmly at the signature-element and small-panel scale. The caveat is cost (€53.06 per batch) and cycle-life verification — architectural-duty switching endurance is untested in architectural production.

Material character

The slab reads a warm amber-brown with a higher 3.02 eV absorption edge than the visibly-coloured siblings of the atlas, so the colour sits lighter and cleaner in the glaze-like surface than the tungsten fraction would suggest. At 5.79 g/cm³ in a 70×70×35 mm format the piece carries weight but not the dead-weight of the La-Mn version — a firm two-handed lift rather than a bench-only register. Surface vitrified matte from the peak fire; edges cold-cut, the kerf powder pale against the warm body. Against the La-Mn-W-Y sibling of the same firing the tone is immediately warmer and the density noticeably lower.