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| Also, the crystalline phase of manganese-based oxides can be identified to some extent, the broad absorption band at around 585 cm−1 for EMD shows that this EMD sample is mainly γ-MnO2 [29]. Two weak shoulders at around 711 cm−1 and 532 cm−1 suggest a possible presence of some α-MnO2 [30]. In the case of EMD300, the absorption at around 658, 609 and 527 cm−1 suggests that this sample contains β-MnO2 phase. In the case of EMD500 sample, the absorption at around 674, 600 and 532 cm−1 also suggests that it contains β-MnO2 phase [31]. The slightly low frequency shift for the most intense band of EMD500 (band at round 600 cm−1), compared with that of EMD300 ((band at round 609 cm−1), suggests that EMD500 contains some low-valent Mn ions and/or O vacancies. The sharp peaks at round 669, 574 and 525 cm−1 in Fig. 3(d) are attributed to the vibrations of Mn–O bonds in α-Mn2O3 phase [32]. As shown in Fig. 3(e), EMD900 shows the adsorption peaks at round 633, 526, 475 and 420 cm−1, which indicate the formation of Mn3O4 [33]. The evolution of the interactions between manganese and oxygen upon heating is attributed to the lattice reorganization accompanying both dehydration and deoxylation process. |
榮譽版主 (知名作家)
快樂島、布吉島島主
| 同時,錳氧化物的晶相可在一定程度上鑒定出來。EMD585 cm-1附近的寬吸收表明樣品中主要為γ-MnO2 29]。711 cm-1和532 cm-1處的兩個肩峰表明可能存在α-MnO2 [30]。在EMD300中,658, 609 、527 cm−1處的吸收峰表明樣品中含有β-MnO2[31]。 相比于EMD300的最強峰(609 cm−1附近的峰),EMD500最強峰(600 cm−1附近的峰)的頻率有輕微位移,這表明EMD500含有低價態(tài)的錳離子和/或氧空穴。圖3(d)中669, 574 、525 cm−1處的尖峰歸屬于α-Mn2O3 相中Mn—O鍵的振動 [32。如圖3(e)所示,EMD900的吸收峰為633, 526, 475 、420 cm−1,表明有Mn3O4生成[33]。加熱時Mn和O的反應(yīng)變化是由于晶格重組以及伴隨的脫水和去氧基化過程。 |
鐵桿木蟲 (正式寫手)
| 而且,化學(xué)家可以一定程度地解析含錳的氧化物的晶體構(gòu)象。(cm-1——波數(shù)wave number的單位,波長的倒數(shù);此處EMD可能文章中有它英文全稱 有道翻譯顯示可能是Electrolytic Manganese Dioxide不過我覺得此處不像)585cm-1處有強吸收峰,表明樣品中主要成分是γ-MnO2。(shoulder想象一下人的頭和肩膀的位置關(guān)系)兩邊的弱峰顯示可能樣品中還含有α-MnO2。在EMD300實驗組中,658,609,527 cm−1三處的吸收峰表明樣品中含有β-MnO2。在EMD500實驗組中,674, 600 and 532 cm−1三處的吸收峰同樣表明樣品中含有β-MnO2。比較EMD300和EMD500實驗組中兩條最強峰可以發(fā)現(xiàn),EMD500實驗組的波數(shù)稍微比EMD300低。我們知道低價錳離子,氧自由基會微弱地影響波數(shù)值,這一現(xiàn)象可能由兩個因素中的一個或兩個引起的。圖譜3d中669,574,525cm−1 處尖峰是α-Mn2O3中錳氧鍵的峰。圖譜3e中633, 526, 475,420cm−1的吸收峰表明樣品中還存在Mn3O4的形式。如果加熱含錳的氧化物,在錳原子和氧原子的相互作用下晶體結(jié)構(gòu)逐漸重排,重排的過程還涉及到分子的脫氫作用和脫氧作用。 |
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