New epsilon-Bi2O3 metastable polymorph.
The new metastable epsilon-Bi2O3 polymorph has been prepared by hydrothermal treatment and structurally characterized. It shows strong relationships with the room temperature alpha form and the metastable beta form through rearrangements of [Bi2O3] columns formed by edge-sharing OBi4 tetrahedra. Its fully ordered crystal structure yields an ionic insulating character. It irreversibly transforms at 400 degrees C to the alpha form. The chemical analysis indicates its undoped bismuth oxide nature, then leading to the fifth characterized Bi2O3 polymorph to date.
Cornei
Nicoleta
N
Faculté de Chimie, Département de Chimie Inorganique, Université "Al. I. Cuza", Boulevard Carol I nr. 11, 6600 Iasi, Romania.
Tancret
Nathalie
N
Abraham
Francis
F
Mentré
Olivier
O