A simple versatile sample holder of low heat capacity for adiabetic calorimetry

Gmetin, E.; Ripka, K.

doi:10.1016/0011-2275(81)90061-8

Cited by 36 publications

(8 citation statements)

References 10 publications

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“…In the temperature range 2 K <~ T~< 100 K the specific heat was determined with an automated adiabatic calorimeter [11] equipped with a high reproducibility sample holder of the sapphire platform type [12]. For thermometry a commercially available germanium resistor was taken; the calorimetric accuracy is currently checked by measuring a standard copper sample.…”

Section: Specific Heatmentioning

confidence: 99%

Chemistry and structural chemistry of phosphides and polyphosphides 51

Gmelin¹,

Hönle²,

Mensing³

et al. 1989

Journal of Thermal Analysis

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The heat capacities of the cluster compounds [Ag6M4P12]Ge 6 (M = Ge, Sn) have been measured in the temperature range from 2 K to 310 K. Thermal decomposition into the elements was carried out under Knudsen conditions on a thermobalance combined with a mass spectrometer. The thermodynamic functions standard entropy, enthalpy, and the Debye temperatures were calculated from the heat capacity data. The vapour pressure functions derived from the Knudsen effusion data, served to calculate the third law heat of formation.The rather complicated temperature dependence of the specific heat is qualitatively discussed by considering structural details and different contributions: electronic term (T~<3 K), a threefold Schottky anomaly (AEo/k = 46(2) K)in the Ge-compounds (2 K ~< T~< 20 K), lattice contributions influenced by the distances Ag-Ag and atomic masses (Ge and Sn) in both compounds.

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Section: Specific Heatmentioning

confidence: 99%

Chemistry and structural chemistry of phosphides and polyphosphides 51

Gmelin¹,

Hönle²,

Mensing³

et al. 1989

Journal of Thermal Analysis

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“…The magnetization of the quartz glass tube was determined in separate runs and subtracted. The heat capacity of powder samples ( m = 260 mg) was measured in a home‐built fully automated double‐shield Nernst adiabatic calorimeter similar to that described in detail by Gmelin et al The sample was encapsulated in Duran glass flasks under ca. 900 mbar helium atmosphere to enable thermal equilibration and attached with a minute amount of Apiezon N vacuum grease to a sapphire platform which carries a thin‐film stainless steel heater and a calibrated Cernox thermometer (CX 1050, Lake Shore Cryotronics, Inc., Westerville OH).…”

Section: Methodsmentioning

confidence: 99%

Synthesis, Crystal Structure, and Magnetic Properties of K₆Mn₄O₇ Featuring a Novel Two‐Dimensional Poly‐oxomanganate(II) Anion

Nuß

Kremer

Jansen

2018

Zeitschrift anorg allge chemie

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K6Mn4O7 was synthesized via the azide/nitrate route from a stoichiometric mixture of the precursors KN3, KNO3, and MnO, and alternatively from the binary constituents K2O and MnO, in an all‐solid state reaction. Its crystal structure [P1, Z = 1, a = 603.46(3), b = 647.69(4), c = 891.36(5) pm, α = 90.477(2)°, β = 108.417(2)°, γ = 115.358(2)°] consists of cluster‐like Mn4O10 units, each composed of four edge sharing MnO4 tetrahedra. The Mn4O10 building blocks, on their part, are linked by six vertices, forming a 2D arrangement, 2∞[Mn4O4/1O6/2]n6–, with the potassium cations occupying the space in between. The temperature dependence of the magnetic susceptibility is dominated by antiferromagnetic coupling along a low‐dimensional magnetic exchange path. The heat capacity reveals no clear sign of long‐range magnetic ordering, supporting an interpretation of K6Mn4O7 as a new low‐dimensional magnetic system.

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“…The sample holder consists of a sapphire plate equipped with an electrical heater resistor and a commercially calibrated Ge resistance thermometer (Cryocal). The samples were mounted onto the calorimetric sample holder [29] with a minute amount (2 to 4 mg) of Apiezon N grease. The heat capacity of the sample holder platform, determined in a separate run, and of the grease [30] were subtracted from the total measured heat capacity.…”

Section: Methodsmentioning

confidence: 99%

High-Density Recording on a Phase-Change Rewritable Disk using a 405 nm Blue Laser Diode

Shoji

Nakamura

Miyashita

et al. 2002

Jpn. J. Appl. Phys.

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The heat capacity of three pure (n, p 2 × 10 16 cm −3 ) germanium crystals with different isotopic compositions was measured in the temperature range from 2.8 K to 100 K. These samples, one made of enriched 70 Ge (95.6%), Ge of natural isotopic composition and n, p < 10 14 cm −3 , and one of the largest possible isotopic mass variance 70/76 Ge (43%/48%) with n, p < 10 14 cm −3 , show a change of the molar heat capacity (and corresponding Debye temperature, θ D ) as expected from the average mass variation, corresponding to θ D ∝ M −0.5 (M = molar mass) at low temperatures. The mass effect is best visible around 21.5 K, at the minimum of the corresponding Debye temperatures θ D , and amounts to θ D = 5.3 K for the difference between the Debye temperatures of 70 Ge and 70/76 Ge. The specific heat capacity of the natural Ge crystal agrees within 2% with the best data available in the literature taken on much larger masses of Ge.

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A simple versatile sample holder of low heat capacity for adiabetic calorimetry

Cited by 36 publications

References 10 publications

Chemistry and structural chemistry of phosphides and polyphosphides 51

Chemistry and structural chemistry of phosphides and polyphosphides 51

Synthesis, Crystal Structure, and Magnetic Properties of K₆Mn₄O₇ Featuring a Novel Two‐Dimensional Poly‐oxomanganate(II) Anion

High-Density Recording on a Phase-Change Rewritable Disk using a 405 nm Blue Laser Diode

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A simple versatile sample holder of low heat capacity for adiabetic calorimetry

Cited by 36 publications

References 10 publications

Chemistry and structural chemistry of phosphides and polyphosphides 51

Chemistry and structural chemistry of phosphides and polyphosphides 51

Synthesis, Crystal Structure, and Magnetic Properties of K6Mn4O7 Featuring a Novel Two‐Dimensional Poly‐oxomanganate(II) Anion

High-Density Recording on a Phase-Change Rewritable Disk using a 405 nm Blue Laser Diode

Contact Info

Product

Resources

About

Synthesis, Crystal Structure, and Magnetic Properties of K₆Mn₄O₇ Featuring a Novel Two‐Dimensional Poly‐oxomanganate(II) Anion