New Lanthanide-Containing Silicate Fluoride Scintillators for Radiation Detection

用于辐射检测的新型含镧系硅酸盐氟化物闪烁体

• 批准号: 1806279
• 负责人: Hans-Conrad zur Loye
• 金额: $ 49.98万
• 依托单位: University of South Carolina at Columbia
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-06-01 至 2022-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1806279&HistoricalAwards=false
• 关键词: New; Lanthanide; Containing; Silicate; Fluoride

Non-TechnicalBorder protection agencies, such as Homeland Security, must be able to detect rogue radiation sources, for example dirty bombs, before they are transported into the country. A pressing need exists for large quantities of materials know as scintillators, which are used in portable detection devices. Scintillators are materials that emit visible light when exposed to radiation, and the better the scintillator, the brighter the light and the smaller the amount of radioactive material that can be detected. This research, funded by the Solid State and Materials Chemistry Program in the Division of Materials Research at NSF, involves the fundamental aspects of crystal growth of improved scintillating materials and thereby advances the field of radiation detection. In addition, this research project provides a valuable educational experience for graduate and undergraduate students. Conducting this research trains students in the art of crystal growth and teaches them the concept of experimental design and methods optimization. Overall, this research contributes to the education and training of a wide range of individuals, including those from underrepresented groups, in the area of solid state and materials chemistry.TechnicalOne area where the development of new functional materials can have a tremendous impact is homeland security. There exists a pressing need for large quantities of efficient scintillating materials for improved radiation detection. This research focuses on the synthesis of new neutron, X-ray, and gamma-ray activated scintillating oxides. Fluorine in mixed anion phases has been identified as one element that plays a crucial role in the intensity of fluorescence, and it has been demonstrated that fluorine can also increase the scintillation efficiency of rare earth silicates. Specifically, it is known that luminescent oxyfluorides in which the fluorine anions are located in LnOxFy polyhedra, such as in Cs3LnSi4O10F2 (Ln = Eu, Tb), a recently discovered brightly scintillating material, can exhibit scintillation as bright as Lu2SiO5:Ce3+. The targeted crystal growth of fluorine containing mixed-anion phases takes advantage of a recently developed enhanced flux growth technique that is known to yield crystals of oxyfluorides and salt-inclusion silicates. To better understand the processes involved in the formation of mixed anion phases in the various flux environments that are used for synthesis of complex oxide single crystals, in-situ neutron diffraction experiments are carried out to identify the optimal growth conditions for preparing new scintillators in the laboratory as well as to transform crystal growth from an empirical to a deliberate process. Additionally, this research contributes to the education and training of a wide range of individuals, including those from underrepresented groups, in the area of solid state and materials chemistry, for example through collaboration with Claflin University, an HBCU institution.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

非技术边境保护机构，例如国土安全部，必须能够在非法辐射源（例如脏弹）运入该国之前对其进行检测。迫切需要大量被称为闪烁体的材料，这些材料用于便携式检测设备。闪烁体是受到辐射时发出可见光的材料，闪烁体越好，发出的光越亮，可检测到的放射性物质的量越小。这项研究由美国国家科学基金会材料研究部的固态和材料化学项目资助，涉及改进的闪烁材料晶体生长的基本方面，从而推动了辐射探测领域的发展。此外，该研究项目为研究生和本科生提供了宝贵的教育经验。进行这项研究可以培训学生晶体生长的艺术，并教授他们实验设计和方法优化的概念。总体而言，这项研究有助于在固态和材料化学领域对广泛的个人（包括来自代表性不足群体的个人）进行教育和培训。技术新功能材料的开发可以产生巨大影响的一个领域是国土安全。迫切需要大量有效的闪烁材料以改进辐射探测。这项研究的重点是合成新的中子、X 射线和伽马射线激活的闪烁氧化物。混合阴离子相中的氟已被确定为对荧光强度起关键作用的一种元素，并且已证明氟还可以提高稀土硅酸盐的闪烁效率。具体来说，众所周知，氟阴离子位于LnOxFy多面体中的发光氟氧化物，例如最近发现的明亮闪烁材料Cs3LnSi4O10F2（Ln = Eu，Tb），可以表现出与Lu2SiO5:Ce3+一样明亮的闪烁。含氟混合阴离子相的目标晶体生长利用了最近开发的增强助熔剂生长技术，该技术已知可产生氟氧化物和含盐硅酸盐晶体。为了更好地了解在用于合成复杂氧化物单晶的各种助熔剂环境中形成混合阴离子相的过程，进行了原位中子衍射实验，以确定在中子中制备新型闪烁体的最佳生长条件。实验室以及将晶体生长从经验过程转变为深思熟虑的过程。此外，这项研究有助于在固态和材料化学领域对广泛的个人进行教育和培训，包括来自代表性不足群体的个人，例如通过与 HBCU 机构克拉夫林大学的合作。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Synthesis, structure, and scintillation of Rb4Ta2Si8O23

Rb4Ta2Si8O23 的合成、结构和闪烁

• DOI: 10.1016/j.solidstatesciences.2022.106861
• 发表时间: 2022
• 期刊: Solid State Sciences
• 影响因子: 3.5
• 作者: Carone, Darren;Jacobsohn, Luiz G.;Breton, Logan S.;zur Loye, Hans-Conrad
• 通讯作者: zur Loye, Hans-Conrad

Flux Crystal Growth, Crystal Structure, and Optical Properties of New Germanate Garnet Ce2CaMg2Ge3O12

• DOI: 10.3389/fchem.2020.00091
• 发表时间: 2020-02
• 期刊: Frontiers in Chemistry
• 影响因子: 5.5
• 作者: Jie Chen;Hong Yan;A. Kuwabara;Mark D. Smith;Y. Iwasa;H. Ogino;Y. Matsushita;Y. Tsujimoto;K. Yamaura;H. zur Loye

Synthesis and Crystal Structure of a 6H Hexagonal Fluoro-Perovskite: RbMgF3

• DOI: 10.1007/s10870-020-00834-5
• 发表时间: 2020-05
• 期刊: Journal of Chemical Crystallography
• 影响因子: 0.8
• 作者: M. Usman;Gyanendra B Ayer;Mark D. Smith;H. Loye

Flux crystal growth of a new BaTa2O6 polymorph, and of the novel tantalum oxyfluoride salt inclusion phase [Ba3F]Ta4O12F: Flux dependent phase formation

新型 BaTa2O6 多晶型物和新型氟氧化钽盐包合物相 [Ba3F]Ta4O12F 的助熔剂晶体生长：助熔剂依赖性相的形成

• DOI: 10.1016/j.jssc.2020.121833
• 发表时间: 2021
• 期刊: Journal of Solid State Chemistry
• 影响因子: 3.3
• 作者: Kutahyali Aslani, Ceren;Klepov, Vladislav V.;zur Loye, Hans-Conrad
• 通讯作者: zur Loye, Hans-Conrad

Phosphorescence in Mn 4+ -Doped R + / R 2+ Germanates ( R + = Na + or K + , R 2+ = Sr 2+ )

Mn 4 掺杂的 R / R 2 锗酸盐（R = Na 或 K，R 2 = Sr 2 ）中的磷光

• DOI: 10.1021/acs.inorgchem.2c01364
• 发表时间: 2022
• 期刊: Inorganic Chemistry
• 影响因子: 4.6
• 作者: Novikov, Sergei A.;Lu, Yimin;Zhang, Weiguo;Halasyamani, P. Shiv;Hariyani, Shruti;Brgoch, Jakoah;Klepov, Vladislav V.;zur Loye, Hans-Conrad;Mozharivskyj, Yurij
• 通讯作者: Mozharivskyj, Yurij