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Stabilized high-temperature hexagonal phase in copper halide nanocrystals |
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| Authors: | I Kh Akopyan V A Gaisin D K Loginov B V Novikov A Tsagan-Manzhiev M I Vasil’ev V V Golubkov |
| Institution: | (1) Fock Institute of Physics, St. Petersburg State University, Ul’yanovskaya ul. 1, Petrodvorets, St. Petersburg, 198504, Russia;(2) Institute of Silicate Chemistry, Russian Academy of Sciences, St. Petersburg, 199155, Russia |
| Abstract: | Low-temperature (T = 4.2–77 K) absorption spectra of CuCl and CuBr nanocrystals in photochromic glass matrixes are studied. A fine structure of exciton absorption bands (Z3 band for CuCl and Z12 band for CuBr) is discovered and studied as a function of nanocrystal size. It is suggested that the high-energy part of the absorption band is due to the high-temperature hexagonal β phase being stabilized in very small samples; a transition to the stable cubic phase with increasing nanocrystal size is demonstrated. |
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