NASICON (sodium super ionic conductor) 化合物為開放性網狀結構，離子會經由氧離子組成之瓶頸 (bottleneck) 進行穿梭產生電性是具有潛力之離子導體。本研究使用固相反應法進行合成，並透過多階段煅燒條件230℃/3 h-630℃/4 h-900℃/12 h 進行煅燒可合成出接近單一相之NaTi2(PO4)3、KTi2(PO4)3、RbTi2(PO4)3與Rb0.8 Na0.2Ti2(PO4)3 粉末，及Na0.5K0.5Ti2(PO4)3以兩相組成之部分固溶體，透過高溫二維XRD進行升溫後之分析 (RT、150℃、300℃、500℃)，引用無機晶體結構資料庫 (ICSD) MTi2(PO4)3 (M=Na, K, Rb)作為標準檔，並配合GSAS之Rietveld refinement晶格常數精算與Diamond軟體進行繪圖計算離子通道中三角形及內切圓瓶頸面積。Na0.5K0.5Ti2(PO4)3 此成份透過兩相進行擬合，推測更貼近實際其況，其中phase 1之鈉鉀比例約在1:9，phase 2則在6:4左右，以這兩結果進行合成，可合成出接近單一相之粉末。煅燒粉末加入2 wt% MgO進行球磨造粒與壓胚，並於1100℃/12 h進行燒結，皆可使燒結相對密度達90%以上，最終會以直流電進行導電率之量測，其中以NaTi2(PO4)3擁有最好的導電率，隨溫度升時MTi2(PO4)3 (M=Na, K, Rb0.8Na0.2, Rb) 之所有成份其瓶頸面積與導電率都有上升之情況呈現正相關，MTi2(PO4)3 (M=Na, K, Rb0.8Na0.2, Rb) 中當置換之離子尺寸愈大時，瓶頸面積會上升但導電率反而下降呈現負相關。

NASICON is a sodium superionic conductor that is an oxide material with high ion conductivity. Sodium ions move in elastic network three-dimensional structural channels to generate electricity, and the channel can be called bottleneck. The study uses the solid-state reaction method for synthesis. The XRD pattern showed that nearly a single phase could be obtained for NaTi2(PO4)3、KTi2(PO4)3、RbTi2(PO4)3、Rb0.8 Na0.2Ti2(PO4)3 and partial solid-solution could be obtained for Na0.5K0.5Ti2(PO4)3 through calcined at more stage 230℃/3 h-630℃/4 h-900℃/12 h. Through high temperature XRD for phase identification after heating up and Rietveld crystal structure actuarial calculations, the crystal structure changes after heating up. Diamond drawing software calculates the area size of the triangle and inscribed circle in the bottleneck. On the other hand, Na0.5K0.5Ti2(PO4)3 ingredient is fitted by using two phases. The sodium-potassium ratio of phase 1 is about 1:9, and phase 2 is about 6:4. The XRD pattern showed that nearly a single phase. Calcination powder was sintered at 1100℃/12 h contains 2wt% MgO to obtain a relative density > 90%. The electrical conductivity of the ceramic body is measured with direct current analysis, and NaTi2(PO4)3 has the best conductivity. When the temperature rises, the conductivity of all ingredients increases, and the bottleneck area rises. The ionic conductivity in room temperature of MTi2(PO4)3 (M=Na, K, Rb0.8Na0.2, Rb) is negatively related to the bottleneck size.

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