Molecular packing in organic anisotropic media: effects of piesothermal factors on optical transmission in polycrystalline samples

• Дата: 2009
• Автори: Minenko, S.S., Tarasenko, O.A., Budakovsky, S.V., Lisetski, L.N., Galunov, N.Z.
• Формат: Стаття
• Мова: English
• Опубліковано: НТК «Інститут монокристалів» НАН України 2009
• Назва видання: Functional Materials
• Теми: Characterization and properties
• Онлайн доступ: http://dspace.nbuv.gov.ua/handle/123456789/137723
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: Molecular packing in organic anisotropic media: effects of piesothermal factors on optical transmission in polycrystalline samples // S.S. Minenko, O.A. Tarasenko, S.V. Budakovsky, L.N. Lisetski, N.Z. Galunov // Functional Materials. — 2009. — Т. 16, № 2. — С. 126-129. — Бібліогр.: 6 назв. — англ.

Optical transmission was measured for pellets made of polycrystalline powders of stilbene and p-terphenyl subject to pressure compaction at temperatures close to the melting point. As compared with similar samples obtained by compaction at room temperature, the transparence was substantially higher, with this difference being more pronounced at higher treatment temperatures and smaller grain size of the initial powder; also, the effect observed was noticeably stronger for trans-stilbene than for p-terphenyl. The obtained results can be explained in terms of local melting and liquid crystalline ordering of the molecules in outer layers of neighboring grains, resulting in more uniform structuring. Since the measured transparence of the samples showed good correlation with the luminescence light yield for short-range alpha-radiation, this approach can also be used as a method for express analysis of the pellet quality in experimental optimization of preparation conditions of polycrystalline organic scintillators.