首次合成出未见文献报道的(NH_4)_7TeV_5O_(19)·3H_2O,经一系列性质研究确定它具有 M_6O_9类型的结构。合成方法是将5 NH_4VO_3溶于200ml 沸水中,在磁力搅伴器上加热,向其中加入2g H_6TePeO_6。用醋酸将溶液的 pH 调至3.8—4.1,在90℃条件下加热约一小时。将溶液放置,自然蒸发,析出桔红色柱状晶体,产率约为80%(按加入的碲量计算)。在pH 为4.5的醋酸溶液中重结晶三次。 For the first time, the reported (NH_4) _7TeV_5O_ (19) · 3H_2O was not reported in the literature, and it was confirmed by a series of properties that it has the structure of M_6O_9 type. The synthetic method is that 5 NH 4 VO 3 is dissolved in 200 ml of boiling water, heated on a magnetic stirrer, and 2 g of H_6 TePeO_6 is added thereto. The pH of the solution is adjusted to 3.8-4.1 with acetic acid and heated at 90C for about one hour. The solution was left to evaporate naturally to precipitate orange-colored columnar crystals in a yield of about 80%, calculated as the amount of tellurium added. Recrystallize three times in acetic acid solution at pH 4.5.