本論文著重於Ba/Sn/Se/M(M = Ag , Au)和Pb/M'/M/Se (M' = Ag , Cu ; M = Sn , Sb , Bi)四元系統新相的發展。以KBr熔融長晶法在800 oC左右合成出四個新穎的化合物。第一個化合物為Ba6Ag2.67Sn4.33Se16晶體，晶系為Monoclinic，空間群為Cc，鍵長a = 15.309(3)(Å)，b = 21.653(4)(Å)，c = 13.258(3)(Å)，鍵角β=125.26(3)°，Z = 8，V = 3588.61(3)Å3。Ba6Ag2.67Sn4.33Se16晶體的結構由SnSe4 和MSe4四面體連結形成一個具有非對稱中心的三維架構。在MSe4四面體中，M的位置有Ag+和Sn4+離子擾動的情況。整體結構可視為MSe4四面體和SnSe4四面體由共角(corner-sharing)的方式連結形成層狀的結構，沿著a軸的方向堆疊所形成。Ba6Ag2.67Sn4.33Se16測量的band-gap為1.95eV。第二個化合物為BaAu2Sn2Se6晶體，由直線的AuSe2 和SnSe4 四面體連結形成一維線性帶狀的結構。在Pb/M'/M/Se (M' = Ag , Cu ; M = Sn , Sb , Bi)系統中，兩種晶體的結構都是Cubic結構，而且band-gap介於0.11eV和0.18之間。

My research is focused on developing new phases in the quaternary systems of Ba/M/Sn/Se (M = Ag , Au) and Pb/M'/M/Se (M' = Ag , Cu ; M = Sn , Sb , Bi). Four new compounds have been prepared by the KBr flux growth method around 800oC. The first compound is Ba6Ag2.67Sn4.33Se16,
which crystallizes in Monoclinic Cc with a = 15.309(3)Å, b =21.653(4)Å,c = 13.258(3)Å, β = 125.26(3)°, Z = 8 and V = 3588.61(3)Å3. The structure of Ba6Ag2.67Sn4.33Se16 adopts a non-centrosymmetric three-dimensional framework consisting of SnSe4 tetrahedra and MSe4 (M = Sn, Ag) tetrahedra, where Ag+ and Sn4+ ions are disorder at the M
sites. This framework can be viewed as the
slabs,constructed by corner-sharing SnSe4 and MSe4 tetrahedra, stacking along a-axis. The measured band-gap of Ba6Ag2.67Sn4.33Se16 is 1.95eV. The second compound is BaAu2Sn2Se6, which structure possesses one-dimensional ribbons consisting of linear AuSe2 and SnSe4 tetrahedra. The other two compounds in the Pb/M'/M/Se (M' = Ag , Cu ; M = Sn , Sb , Bi) system crystallize in the Cubic symmetry. The measured band-gaps of the two compounds are between 0.11-0.18eV.

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