利用水熱法合成含鉛碲(IV, VI)酸鹽化合物並鑑定之晶體結構;Hydrothermal Synthesis and Crystal Structures of Lead Tellurium(IV, VI) Oxycompounds

NCU Institutional Repository > 理學院 > 化學研究所 > 博碩士論文 > Item 987654321/85657

請使用永久網址來引用或連結此文件: http://ir.lib.ncu.edu.tw/handle/987654321/85657

題名:	利用水熱法合成含鉛碲(IV, VI)酸鹽化合物並鑑定之晶體結構;Hydrothermal Synthesis and Crystal Structures of Lead Tellurium(IV, VI) Oxycompounds
作者:	李函穎;Li, Han-Ying
貢獻者:	化學學系
關鍵詞:	非線性光學;碲酸鹽;nonlinear optical
日期:	2021-07-19
上傳時間:	2021-12-07 11:12:02 (UTC+8)
出版者:	國立中央大學
摘要:	本論文利用高溫高壓水熱合成法及中溫水熱合成法分別合成兩個新穎的化合物 Ba3PbTe6O16 (BPTO)、 Na2Pb9( 66-O)2(Te2O10)2 ( 這兩個化合物皆藉由單晶 X光繞射方法分析化合物的晶體結構，再以粉末 X光繞射分析圖，確定樣品純度，並用 EDS確定化合物元素組成，更進一步以 XPS來確定碲金屬離子的價數。 BPTO空間群為 R-3屬於中心對稱，結構中每六個蹺蹺板型的 TeO4 單元會與水平面上的 O(3)或 O(4)共角連接，沿著 ab平面形成六圓環的層狀結構，在六圓環結構中，相鄰的 TeO4 單元其孤對電子朝向三個不同方向，並由鉛二正離子和鋇二正離子作為層與層之間的連接，形成三維網狀結構。 NPTO空間群為 Cmcm，結構中兩個 Te6+O6 多面體以共邊方式連接形成 Te2O10 二聚體 (dimer)並與 O@Pb5Na團簇上的鉛二正離子共享氧原子以共角方式連接形成三維的網狀結構。 (O@Pb5Na表示一個 O2- 陰離子作為團簇中心與五個 Pb2+ 和一個 Na+ 形成六配位八面體的團簇構型 )。在碲酸鹽文獻中， BPTO結構中的六圓環無限延伸層和 NPTO結構中以 O2- 陰離子為團簇中心所形成的 O@Pb5Na團簇構型皆是十分稀有特別的結構，因此利用高溫高壓水熱法和中溫水熱法兩種合成方法有助於新穎結構化合物的生成。;This thesis reports two novel lead-tellurium-oxygen compounds, Ba3PbTe6O16 (BPTO) and Na2Pb9( 66-O)2(Te2O10)2 (NPTO), were synthesized under hydrothermal conditions at 560 and 210℃℃, respectively. The crystal structures of the compounds are analyzed by the single crystal X-ray diffraction method. The powder X-ray diffraction analysis datas are used to determine the purity of the samples. The element compositions of the compounds are determined by EDS. And XPS is further measured to determine the valence of the tellurium metal ion. The space group of BPTO is the centrosymmetric R3. The six-membered rings along the ab plane in the structure of BPTO every six seesaw-shaped TeO4 unit connects with O(3) or O(4) by sharing corner. The adjacent TeO4 units in the six-membered rings with lone pairs electrons force the seesaw-shaped TeO4 units toward three different directions, and the Ba2+ and Pb2+ cations are situated in the interlayer region forms a three-dimensional network structure. The space group of NPTO is Cmcm contains dimers of edge-sharing Te6+O6 octahedra, which are connected through five coordinate Pb2+ cations. A unique six-coordinate O atom is at the center of the octahedron formed by five Pb2+ and one Na+ cations. (O@Pb5Na represents an O2- anion as the cluster center and five Pb2+ and one Na+ to form a six-coordinate octahedral cluster configuration). In the tellurite literatures, the six-membered rings infinitely extended layer in the structure of the BPTO and the O@Pb5Na cluster configuration formed by the O2- anion as the cluster center in the structure of the NPTO are very rare and special structures. In other words, it is a very good strategy to synthesize novel structural compounds by hydrothermal method.
顯示於類別:	[化學研究所] 博碩士論文

文件中的檔案:

檔案	描述	大小	格式	瀏覽次數
index.html		0Kb	HTML	52	檢視/開啟

在NCUIR中所有的資料項目都受到原著作權保護.

社群 sharing

資料載入中.....