Defect mode and crystal-electric-field effects on the thermal expansion and heat capacity of RB50 boride

Новиков, В. В.; Zhemoedov, N. A.; Matovnikov, A. V.; Mitroshenkov, N. V.; Kornev, B. I.; Кузнецов, С. В.; Popova, E. A.; Ueland, B. G.; Bud'ko, S. L.; Tolstosheev, Andrey

doi:10.1007/s10973-017-6186-7

Cited by 9 publications

(2 citation statements)

References 25 publications

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“…Namely, vibrations of the two‐level systems in the guest substructure lead to a Schottky‐like contribution into the total heat capacity and to a slight increase of the unit cell volume at low temperatures close to zero. Similar behavior was previously observed for type‐I clathrates at even lower temperatures. The principal difference between the type‐I and type‐VII clathrates lies in details of their crystal structure, including the size and shape of polyhedral cages, chemical composition of the framework and the nature of the guest atoms.…”

Section: Resultssupporting

confidence: 87%

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Structure‐Related Thermal Properties of Type‐VII Clathrates SrNi₂P₄ and BaNi₂P₄ at Low Temperature

Новиков

Pilipenko

Matovnikov

et al. 2018

Physica Status Solidi (b)

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Heat capacity C P (T) (2-300 K) and unit cell parameters a(T), b(T), and c(T) (5-300 K) of type-VII clathrates SrNi 2 P 4 and BaNi 2 P 4 have been investigated experimentally. The studied compounds are prepared by a two-stage ampoule synthesis. Diffuse maxima of C P (T) near 5 K along with anomalies in temperature dependencies of unit cell parameters below 10 K are observed and related to the influence of two-level systems in guest-atom substructures. Joint analysis of temperature dependencies of heat capacity and unit cell volume of both clathrates within the frames of the Debye-Einstein model allowed determining characteristic temperatures of the clathrate frameworks and guest atoms as well as parameters of the two-level systems. The relationships of the obtained characteristics and the peculiarities of the crystal structures of SrNi 2 P 4 and BaNi 2 P 4 are discussed.

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Section: Resultssupporting

confidence: 87%

“…The X‐ray diffraction study of the clathrate lattice dynamics was performed in the range of 5–300 K using a DRON‐7 diffractometer (Burevestnik, Saint‐Petersburg) equipped with a helium cryostat. All methods used were described in detail elsewhere . Plate‐like samples 10 mm in length and 1 mm thick were used.…”

Section: Methodsmentioning

confidence: 99%

Structure‐Related Thermal Properties of Type‐VII Clathrates SrNi₂P₄ and BaNi₂P₄ at Low Temperature

Новиков

Pilipenko

Matovnikov

et al. 2018

Physica Status Solidi (b)

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Debye–Einstein model and anomalies of heat capacity temperature dependences of solid solutions at low temperatures

Новиков

2019

J Therm Anal Calorim

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Specific features of the heat capacity and thermal expansion of icosahedral holmium boride HoB50 at temperatures of 2–300 K

Новиков

Zhemoedov

Matovnikov

et al. 2017

Journal of Alloys and Compounds

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Defect mode and crystal-electric-field effects on the thermal expansion and heat capacity of RB50 boride

Cited by 9 publications

References 25 publications

Structure‐Related Thermal Properties of Type‐VII Clathrates SrNi₂P₄ and BaNi₂P₄ at Low Temperature

Structure‐Related Thermal Properties of Type‐VII Clathrates SrNi₂P₄ and BaNi₂P₄ at Low Temperature

Debye–Einstein model and anomalies of heat capacity temperature dependences of solid solutions at low temperatures

Specific features of the heat capacity and thermal expansion of icosahedral holmium boride HoB50 at temperatures of 2–300 K

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Defect mode and crystal-electric-field effects on the thermal expansion and heat capacity of RB50 boride

Cited by 9 publications

References 25 publications

Structure‐Related Thermal Properties of Type‐VII Clathrates SrNi2P4 and BaNi2P4 at Low Temperature

Structure‐Related Thermal Properties of Type‐VII Clathrates SrNi2P4 and BaNi2P4 at Low Temperature

Debye–Einstein model and anomalies of heat capacity temperature dependences of solid solutions at low temperatures

Specific features of the heat capacity and thermal expansion of icosahedral holmium boride HoB50 at temperatures of 2–300 K

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Structure‐Related Thermal Properties of Type‐VII Clathrates SrNi₂P₄ and BaNi₂P₄ at Low Temperature

Structure‐Related Thermal Properties of Type‐VII Clathrates SrNi₂P₄ and BaNi₂P₄ at Low Temperature