Negative thermal expansion and anomalies of heat capacity of LuB50 at low temperatures

Novikov, V. V.; Zhemoedov, N. A.; Matovnikov, A. V.; Mitroshenkov, N. V.; Kuznetsov, S. V.; Bud'ko, S. L.

doi:10.1039/c5dt01406a

Title: Negative thermal expansion and anomalies of heat capacity of LuB₅₀ at low temperatures

Journal Article · Mon Jul 20 00:00:00 EDT 2015 · Dalton Transactions

DOI:https://doi.org/10.1039/c5dt01406a· OSTI ID:1227399

Novikov, V. V. ^[1]; Zhemoedov, N. A. ^[1]; Matovnikov, A. V. ^[1]; Mitroshenkov, N. V. ^[1]; Kuznetsov, S. V. ^[1]; Bud'ko, S. L. ^[2]

Petrovsky Bryansk State Univ., Bryansk (Russia)
Iowa State Univ., Ames, IA (United States)

Heat capacity and thermal expansion of LuB₅₀ 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 LuB₅₀ 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 LuB₅₀ 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 LuB₅₀ were compared to the corresponding values for LuB₆₆, which was studied earlier. Negative thermal expansion at low temperatures was experimentally observed for LuB₅₀. The analysis of the experimental temperature dependence for the Gruneisen parameter of LuB₅₀ suggested that the low-frequency oscillations, described in SAP mode, are responsible for the negative thermal expansion. As a result, the glasslike character of the behavior of LuB₅₀ thermal characteristics at low temperatures was confirmed.

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Research Organization:: Ames Lab., Ames, IA (United States)

Sponsoring Organization:: USDOE Advanced Research Projects Agency - Energy (ARPA-E)

Grant/Contract Number:: AC02-07CH11358; 3.105.214/K; 13-02-97503 r-center-a

OSTI ID:: 1227399

Report Number(s):: IS-J-8787; ICHBD9

Journal Information:: Dalton Transactions, Vol. 44, Issue 36; ISSN 1477-9226

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 23 works

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