贵州工程应用技术学院化学工程学院，毕节 551700
以固体废弃物磷石膏为原料，在传统常压醇水热法的基础上添加CaSO4·2H2O为晶种制备半水硫酸钙晶须。采用单因素试验法探究了晶种含量、丙三醇含量和磷石膏质量分数对晶须结构和形貌的影响，确定晶须的最佳制备工艺条件。采用SEM和XRD对样品进行表征分析，实验结果表明:添加CaSO4·2H2O晶种制备晶须的长径比(49.29)比只添加丙三醇的样品的长径比(30.99)提高了近60%；当丙三醇与水的体积比(V)为1、晶种含量为1%、磷石膏质量分数为5%时制备的晶须的平均直径为0.65 μm，长径比达到了62.15，晶须的尺寸均匀。这说明添加1%CaSO4·2H2O晶种、V为1的丙三醇和质量分数为5%的磷石膏在常压下能制备出高长径比和尺寸均匀的半水硫酸钙晶须。
磷石膏 半水硫酸钙晶须 丙三醇 水热法 晶种 长径比 工艺参数 phosphogypsum hemihydrate calcium sulfate whisker glycerol hydrothermal method crystal seed aspect ratio technological parameter
Author Affiliations
Abstract
1 Key Laboratory of Photoelectronic Materials, Ningbo University, Ningbo 315211, China
2 Ningbo Institute of Materials Technology and Engineering, the Chinese Academy of Sciences, Ningbo 315211, China
3 Department of Physics, Dalian Maritime University, Dalian 116026, China
A Ce3+ ion-doped α-NaYF4 single crystal of high quality is grown successfully by an improved flux Bridgman method under the conditions of taking the chemical raw composition of NaF:KF:YF3:CeF3 in the molar ratio of 30∶18∶48∶4, where the KF is shown to be an effective assistant flux. The x ray diffraction, absorption spectra, excitation spectra, and emission spectra of the Ce3+-doped α-NaYF4 single crystal are measured to investigate the phase and optical properties of the single crystals. The absorption spectrum of the Ce3+:α-NaYF4 shows a strong band that peaks at the wavelength of 300 nm. The emission spectrum of the Ce3+:α-NaYF4 emits an intense ultraviolet (UV) band at the wavelength of 332 nm under the excitation of 300 nm light. Two separated luminous bands of 330 and 350 nm, which correspond to the transitions 5d→F5/22 and 5<
160.0160 Materials 230.0230 Optical devices 260.1180 Crystal optics 300.0300 Spectroscopy Chinese Optics Letters
2016, 14(6): 061601
Author Affiliations
Abstract
1 Key Laboratory of Photo-Electronic Materials, Ningbo University, Ningbo 315211, China
2 Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315211, China
3 Department of Physics, Dalian Maritime University, Dalian 116026, China
The absorption spectra, excitation spectra, and emission spectra of
Tb3+/Eu3+ ions in
LiYF4 single crystals synthesized by an improved Bridgman method are measured. The emission spectra of several bands, mainly located at blue
～487 nm (
Tb:D45→F76), yellowish green
～542 nm (
Tb:D45→F75), and red
～611 nm (
Eu:D05→F72) wavelengths, are observed under excitation by UV light. An ideal white light emission as a result of simultaneous combination of these emissions can be obtained from 1.11 mol%
160.0160 Materials 230.0230 Optical devices 300.0300 Spectroscopy Chinese Optics Letters
2015, 13(7): 071601
