Na-Ti-O系化合物の合成と結晶構造
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概要
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The new members of mixed-valence sodium titanates; NaTi<SUB>2</SUB>O<SUB>4</SUB>, Na<SUB>2.08</SUB>Ti<SUB>4</SUB>O<SUB>9</SUB>, Na<SUB>1.68</SUB>Ti<SUB>6</SUB>O<SUB>11</SUB>, Na<SUB>0, 57</SUB>Ti<SUB>2</SUB>O<SUB>4</SUB> and NaTi<SUB>8</SUB>O<SUB>13</SUB> were synthesized and their crystal structures were determined by the single-crystal X-ray diffraction method. Most of them are classified into the “rutile-related type” tunnel structure group, different from the previously reported “Wadsley-Andersson type” one. Every sodium titanate of the rutile-related type belongs to either the mixed-valence compound or the sodiumdefect type one. The mixed-valence octahedral sites and sodium defects in the structure of these new rutile-related compounds appear to be related to the sodium vapor pressure in their synthetic condition.
- 日本結晶学会の論文