The calcium oxidotellurates Ca<sub>2</sub>(Te<sup>IV</sup>Te<sup>VI</sup>O<sub>7</sub>), Ca<sub>2</sub>(Te<sup>IV</sup>O<sub>3</sub>)Cl<sub>2</sub> and Ca<sub>5</sub>(Te<sup>IV</sup>O<sub>3</sub>)<sub>4</sub>Cl<sub>2</sub> obtained from salt melts
Zeitschrift für Naturforschung. B, A journal of chemical sciences