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Mills, Stuart J.
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article
Crystal structure and thermal behavior of Bi 6 Te 2 O 15
Abstract
<p>The previously unknown crystal structure of pingguite was determined and refined from laboratory X-ray powder diffraction data using a synthetic sample. Additional single crystal diffraction of natural pingguite confirms that the crystal structure of the synthetic sample is identical to the natural mineral. This new crystal structure calls for a revised chemistry of the rare mineral pingguite to Bi<sub>6</sub>Te<sub>2</sub>O<sub>15</sub> instead of the previously reported formula Bi<sub>6</sub>Te<sub>2</sub>O<sub>13</sub>. Pingguite contains Te<sup>VI</sup> only and not Te<sup>IV</sup> as previously reported. Pingguite undergoes an irreversible phase transition around 840 <sup>∘</sup>C which is characterized by a loss of oxygen and a reduction from Te<sup>VI</sup> to Te<sup>IV</sup> resulting in a δ-Bi<sub>2</sub>O<sub>3</sub> like type structure. In addition, we report the Raman spectroscopic data on the natural pingguite.</p>