NDLI: Negative thermal expansion and anomalies of heat capacity of $LuB

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Zhemoedov, N. A. Novikov, V. V. Matovnikov, A. V. Mitroshenkov, N. V. Kuznetsov, S. V. Bud'ko, S. L.
Description	Author Affiliation: Novikov VV ( Bryansk Physical Laboratory, Petrovsky Bryansk State University, 14, Bezhitskaja St., 241036 Bryansk, Russia. vvnovikov@mail.ru.)
Abstract	Heat capacity and thermal expansion of $LuB_{50}$ boride were experimentally studied in the 2–300 K temperature range. The data reveal an anomalous contribution to the heat capacity at low temperatures. The value of this contribution is proportional to the first degree of temperature. It was identified that this anomaly in heat capacity is caused by the effect of disorder in the $LuB_{50}$ crystalline structure and it can be described in the soft atomic potential model (SAP). The parameters of the approximation were determined. The temperature dependence of $LuB_{50}$ heat capacity in the whole temperature range was approximated by the sum of SAP contribution, Debye and two Einstein components. The parameters of SAP contribution for $LuB_{50}$ were compared to the corresponding values for $LuB_{66},$ which was studied earlier. Negative thermal expansion at low temperatures was experimentally observed for $LuB_{50}.$ The analysis of the experimental temperature dependence for the Gruneisen parameter of $LuB_{50}$ suggested that the low-frequency oscillations, described in SAP mode, are responsible for the negative thermal expansion. Thus, the glasslike character of the behavior of $LuB_{50}$ thermal characteristics at low temperatures was confirmed.
ISSN	14779226
Issue Number	36
Journal	Dalton Trans.
Volume Number	44
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2015-09-28
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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