期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 139, 期 3, 页码 1285-1295出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.6b11965
关键词
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资金
- Welch Foundation [E-1457]
- 3M Non-Tenured Faculty Award
- Office of the Provost
- Office for Research
- Northwestern University Information Technology
- CARBON cluster at the Center for Nanoscale Materials at Argonne National Laboratory - U.S. DOE, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
- [NSF-DMR-1503573]
- [NSF-DMR-1454688]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1454688] Funding Source: National Science Foundation
Noncentrosymmetric mixed-metal carbonate fluorides are promising materials for deep-ultraviolet (DUV) nonlinear optical (NLO) applications. We report on the synthesis, characterization, structure-property relationships, and electronic structure calculations on two new DUV NLO materials: KMgCO3F and Cs9Mg6(CO3)(8)F-5. Both materials are noncentrosymmetric (NCS). KMgCO3F crystallizes in the achiral and nonpolar NCS space group P (6) over bar 2m, whereas Cs9Mg6(CO3)(8)F-5 is found in the polar space group Pmn2(1). The compounds have three-dimensional structures built up from corner-shared magnesium oxyfluoride and magnesium oxide octahedra. KMgCO3F (Cs9Mg6(CO3)(8)F-5) exhibits second-order harmonic generation (SHG) at both 1064 and 532 nm incident radiation with efficiencies of 120 (20) x alpha-SiO2 and 0.33 (0.10) X beta-BaB2O4, respectively. In addition, short absorption edges of <200 and 208 nm for KMgCO3F and Cs9Mg6(CO3)(8)F-5, respectively, are observed. We compute the electron localization function and density of states of these two compounds using first-principles density functional theory, and show that the different NLO, responses arise from differences in the denticity and alignment of the anionic carbonate units. Finally, an examination of the known SHG active AMCO(3)F (A = alkali metal, M = alkaline earth metal, Zn, Cd, or Pb) materials indicates that, on average, smaller A cations and larger M cations result in increased SHG efficiencies.
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