Nanocrystalline A4B2O9 type niobate ceramic prepared through ultralow-temperature sintering, and preparation method thereof
An A4B2O9 and niobate technology is applied in the field of ultra-low temperature sintering to prepare nanocrystalline A4B2O9 type niobate ceramics, which can solve the problems of high cost, high prices of tantalate and rare earth elements, reduce thermal conductivity, shorten sintering time, Avoid high porosity effects
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[0041] Example 1:
[0042] Non-low temperature sintering prepared nanocrystalline A4B2O9 niobate ceramic, the ceramic structure of CO 4 NB 2 O 9 . Its preparation method includes the following steps:
[0043] step one,
[0044] Coco 3 , Oxalate is 1-1.5 h at 450-950 ° C, and COO and NB having high degrees of reaction is obtained by thermal decomposition. 2 O 5 . In the present embodiment, the temperature is preferably 720 ° C, and the holding time is preferably 1 h.
[0045] Step two,
[0046] Will COO, NB 2 O 5 The powder and purity of 99.99% alcohol were blocked into a high energy ball mill for grinding, the weight ratio of powder and alcohol was 1: 6-10, and the rotational speed at the time of grinding was 2200-3500 rpm, and the grinding time was 11-24h. After the grinding is completed, the powder was taken out, and the powder was charged at 65-80 ° C for 6-10 h, and the powder was dried to form a highly reactive powder mixture having a nanometer size. In this embodiment, the wei...
Example Embodiment
[0049] Example 2:
[0050] Example 2 and Example 1 Differences in that the structural formula of the A4B2O9 type cerium tantate ceramic in the present embodiment is Ni 4 NB 2 O 9 The preparation method is consistent with Example 1.
Example Embodiment
[0051] Example 3:
[0052] Embodiment 3 The difference from Embodiment 1 is that the structural formula of the A4B2O9 type citrate ceramic in this embodiment is Mg 4 NB 2 O 9 The preparation method is consistent with Example 1.
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