溶膠soluppt課件-資料下載頁
2025-01-15 01:51本頁面
【正文】 nd hydrolysis The electronegativity of an aquohydroxo plex C=[M(OH)h(OH2)Nh](zh)+ Therefore PCM and Aquo, oxo domains The partial charge model also gives the basis for the experimental determination of the domains in which pure aquo plexes, [M(H2O)N]z+, and pure oxo anions, [MOm](2mz), are respectively formed [Li(OH2)4]+ SO42 PCM and the first deprotonation constant K11 A 絕對值越大，越不容易水解 4. 陰離子效應(yīng) 1. 陰離子對水合鹽結(jié)構(gòu)有影響嗎？主要通過什么方式影響？ 2. 用磷酸鹽、硝酸鹽等不同的鹽（金屬離子相同），對水合物結(jié)構(gòu)有影響嗎？ 3. 如果對結(jié)構(gòu)有影響，勢必對溶膠凝膠過程有影響？ Complexation with anions With a monodentate anionic group X If only ?(X) 1, or ? ?(X) ?1 ?(X)?([M(OH2)N1]z+ Rewrite using electronegativities With a molecular group HX If only ?(HX) 0, or ?(X) 1 [Fe(OH)2(OH2)4]+ with bidentate anions With X = CH3COO X separates from the metal plex when At the exact moment of separation Thus, plex is formed only if ?(X) Thus, plex is formed only if ?(HX) Overall plexation of a metal M by anions 先驅(qū)體變化的例子 制備 NASICON的原材料 1. NASICON (Na3Si2Zr2PO12) 2. ZrO(NO3)2, NH4H2PO4, Na2SiO3 3. Citric acid and tartaric acid Species in the precursor solution 1. ZrO2+, Zr4+ 2. PO43, HPO42, H2PO4, H3PO4 3. ZrO(HPO4), Zr(HPO4)2 (沉淀） 4. Na2SiO3 Equilibria without hydroxyacids Equilibria with hydroxyacids With citric acid With tartaric acid Zirconium solubility Therefore And Finally Zirconium solubility at Zirconium solubility at Zirconium solubility versus citric acid concentration Zirconium solubility versus citric acid concentration
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