本論文以高溫高壓水熱法合成結構含共邊BO4四面體的鋇硼酸鹽α-Ba3B10O17(OH)2 (α-form)。藉由單晶X光繞射方法，鑑定出化合物的晶體結構，再以粉末X光繞射分析比對理論圖，確定樣品純度並用X光能量散布分析儀確定化合物的組成。α-Ba3B10O17(OH)2為三維結構，整體結構以兩個不同的基礎建構單元(FBB)來描述。FBB1是由四個BO3三角形與六個BO¬4四面體所構成，可用符號簡化成4Δ6□:[⧄⧅]-<3□>-<2Δ□>|-<3□>-<2Δ□>|，為少數具有共邊BO4的結構；而FBB2是由兩個BO3三角形與三個BO¬4四面體所構成的雙六員環構型，可將其用符號簡化成23□:<Δ2□>-<Δ2□>。FBB1是落在ac平面中，而Ba(3)座落於空間之中。FBB2會與四個相鄰的FBB2以共享氧原子的方式在ac平面上形成無限延伸層，在層中具有九員環的構型，Ba(1)、Ba(2)座落於九員環之中。α-Ba3B10O17(OH)2為少數被發現結構中具有共邊特性的硼酸鹽化合物，更重要的是此化合物為第一個利用水熱法所合成之結構中具有共邊特性的硼酸鹽，並證實了高溫高壓水熱法合成新穎結構化合物是一個好的策略。;A new barium borate, α-Ba3[B10O17(OH)2](α-form), has been synthesized through hydrothermal reaction at 500 °C and 1000 bar and the structure determined by single-crystal X-ray diffraction. The 3D framework structure of the α-form is formed of two different fundamental building blocks (FBB) with the descriptors 4Δ6□:[⧄⧅]−<3□>−<2Δ□>|−<3□>−<2Δ□>| (FBB1) and 2Δ3□:<Δ2□>−<Δ2□> (FBB2). FBB1 is unique and contains unusual edge-sharing BO4 tetrahedra. The 3D framework of α-form consists of alternating sheets of FBB1 and FBB2 in ac plane. There are two kinds of narrow channels parallel to the a axis where the Ba2+ cations are located. The structure of α-form is very interesting and it is one of the few compounds with es-BO4. All of the other compounds were synthesized through solid state reactions at high temperature under high pressure or ambient pressure. α-Ba3[B10O17(OH)2] is the first compound with edge-sharing BO4 tetrahedra synthesized in aqueous solution under hydrothermal conditions.
