Color‐Changing Sparks from Rare Earth Metal Powders

Autor:	Wolfgang Schade, Jannis Koch, Felix Lederle, Eike G. Hübner
Rok vydání:	2020
Předmět:	Inorganic Chemistry Lanthanide Metal Chemistry visual_art ddc:540 Metallurgy Rare earth article visual_art.visual_art_medium Pyrotechnics
Zdroj:	Zeitschrift für anorganische und allgemeine Chemie. 646:37-46
ISSN:	1521-3749 0044-2313
Popis:	Commonly, sparks emit light according to the well-known black (gray) body radiation. Recently, we reported on color‐changing sparks based on erbium powder, which switch their light emission between black body emission (surface combustion) and element‐specific emission (vapor phase combustion). Herein, we investigated the spark formation from the adjacent rare‐earth elements. The corresponding boiling points are significantly below (Yb, Sm, Tm) or above (Y, Lu) the boiling point of Er. While Yb and Sm evaporate too fast to form longer sparks, Y, Lu and Tm form color‐changing sparks with varying length of the element‐specific emission phase. The sparks were investigated by time‐resolved emission spectroscopy, long‐time exposures, and NIR/MIR imaging. The same basic pyrotechnic formulation containing one of these metal powders reveals a strongly differing burning behavior depending on the boiling point of the metal. The burning characteristics change from a green strobe (Yb) to intense colorful crackling (Tm) and finally a sparkling fountain with long‐flying sparks (Lu, Y, Er).
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::adc8a5dedbd403e90013095b9888d621 https://doi.org/10.1002/zaac.201900300 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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