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Front Cover: Color‐Changing Sparks from Rare Earth Metal Powders (Z. Anorg. Allg. Chem. 2/2020)
Author(s) -
Lederle Felix,
Koch Jannis,
Schade Wolfgang,
Hübner Eike G.
Publication year - 2020
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.202070021
Subject(s) - ammonium perchlorate , materials science , art , composite material , composite number
The cover picture shows colorful sparks emitted from a smokeless nitrocellulose/ammonium perchlorate formulation containing rare‐earth metal powders. In contrast to common sparks based on black body radiation, the rare‐earth elements provide sparks based on vapor phase combustion and element‐specifically emitting phases. Depending on the boiling point of the metal, colorful flashes (Yb, green), color‐changing sparks (Er (bright gold/green), Y (bright gold/red)) or long‐flying sparks (Lu, white gold) are obtained. These sparks pave the way to new colors in pyrotechnic compositions at our fingertips. We gratefully acknowledge the help of Marco Tapken (photographer) and Madeline Haase (hand model) in creating the cover picture. More Details can be found in the Article by Felix Lederle, Jannis Koch, Wolfgang Schade, and Eike G. Hübner on page 37 ff.