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- W2013216287 abstract "Infrared transmission and reflectance measurements are made on single crystals of the layered compound ZnIn2S4 with C3v5 structure in the range between 4000 and 33 cm-1,. According to group-theoretical analysis there are altogether 4A1 + 6E zone centre optical modes which are both ir- and Raman-active. 4A1 + 4E modes should be intralayer modes, the remaining 2A1 + 2E ones should be rigid layer modes with distinctly lower frequencies. The number of observed one-phonon frequencies is found to be by far larger than expected. 16 frequencies of ZnIn2S4 are found to coincide very well with frequencies of certain critical-point phonons of cubic ZnS and with certain phonon frequencies of β-In2S4 respectively. The “additional” frequencies related to the number of frequencies predicted by group theory, which occur in the ir spectrum, are believed to arise from broken translational symmetry of the lattice. Es werden Transmissions- und Reflexionsmessungen an Einkristallen des in der Raumgruppe C3v5 in Form einer Schichtstruktur kristallisierenden ZnIn2S4 im Bereich zwischen 4000 und 33 cm-1 durchgeführt. Gemäß einer gruppentheoretischen Analyse gibt es für den Punkt Γ insgesamt 6A1 + 6E optische Phononen, welche sowohl IR- als auch Raman-aktiv sind. 4A1 + 4E Moden sollten intralayer Moden, die restlichen 2A1 + 2E rigid layer Moden sein. Letztere sollten deutlich niedrigere Frequenzen als erstere besitzen. Es wird gefunden, daß die Zahl der beobachteten EinPhonon-Frequenzen wesentlich größer ist als erwartet. 16 Frequenzen des ZnIn2S4 stimmen mit Frequenzen von Phononen bestimmter kritischer Punkte des kubischen ZnS bzw. mit bestimmten Phononenfrequenzen des β-In2S4 überein. Es wird angenommen, daß die “zusätzlichen” Frequenzen im IR-Spektrum, bezogen auf die Zahl der nach der Gruppentheorie zu erwartenden Frequenzen, davon herrühren, daß die Translationssymmetrie des Gitters durehbrochen ist." @default.
- W2013216287 created "2016-06-24" @default.
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- W2013216287 date "1977-08-01" @default.
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- W2013216287 title "Infrared Studies of the Layered Compound ZnIn2S4" @default.
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- W2013216287 doi "https://doi.org/10.1002/pssb.2220820214" @default.
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