The electrical conductivity and thermal electromotive force of lithium hydride and lithium deuteride at 20-50 GPa

Бабушкин, А. Н.; Pilipenko, G. I.; Gavrilov, F. F.

doi:10.1088/0953-8984/5/46/005

Cited by 22 publications

(11 citation statements)

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“…This method for determining pressure was tested with a significant group of different materials over wide temperature and pressure ranges. The measurement procedure was described in detail elsewhere [7].…”

Section: Methodsmentioning

confidence: 99%

“…The resistivity, Hall coefficient, and pressure measurement errors were ±3, 3.5, and 3%, respec tively. The measurement procedure was described in more detail elsewhere [4,5].Pressure from 15 to 50 GPa was produced with the use of a high pressure chamber (HPC) with anvils of the plane-rounded cone type [6,7], made from the carbonado type synthetic polycrystalline diamonds. These anvils are good electric conductors; this fact makes it possible to measure the pressure and tempera ture dependences of the resistance of a sample placed between the anvils, which are used as contacts.…”

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confidence: 99%

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Pressure and temperature dependences in p-ZnAs2 at high pressures

Mollaev

Маренкин

Alibekov

et al. 2013

Russ. J. Inorg. Chem.

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Zinc diarsenide (ZnAs 2 ) is a II-V semiconductor compound, which crystallizes in the monoclinic sys tem [1] and has the band gap energy E g ≈ 1 eV. The structure peculiarity of ZnAs 2 is the presence of bands between As atoms, which form zigzag chains elon gated along the c axis (crystallographic orientation [100]), together with Zn-As bonds; this peculiarity is responsible for the significant anisotropy of electrical and optical properties. Along with the high transpar ency of ZnAs 2 in a wide range of wavelengths in the IR region (1.4-20 μm), the possibility of developing a solid state laser on its basis is of the greatest interest for practical use [2]. Induced emission at a wavelength of 1.235 μm was obtained from ZnAs 2 single crystals upon electronic pumping.Among the publications dedicated to the study of ZnAs 2 at high pressures, the work by Clark and Pisto rius [3] is well known; they measured the resistivity of polycrystalline ZnAs 2 in Bridgman anvils at pressures to 11 GPa at 25°С. However, the I-II phase transition to P ≤ 11 GPa was not discovered by resistometric measurements. Therefore, it was of interest to deter mine resistivity and Hall effect in the single crystal samples of ZnAs 2 . EXPERIMENTALThe measurements were performed at hydrostatic (to P ≤ 9 GPa) and quasi hydrostatic (to P ≤ 50 GPa) pressures. The hydrostatic pressure was generated by a compression unit with a stress of 500 ton force. The dependences of resistivity ρ and Hall coefficient R H were measured simultaneously in a Toroid anvil/trun cated hemisphere type high pressure apparatus (HPA), which was placed in a multiturn solenoid with the magnetic field intensity H ≤ 300 kA/m [4]. The sizes of the samples were 3 × 0.8 × 0.8 mm. A mixture of ethanol-methanol in a ratio of 4 : 1, which is hydro static to the pressures P ≤ 9 GPa, was used as a pressure fluid. The resistivity, Hall coefficient, and pressure measurement errors were ±3, 3.5, and 3%, respec tively. The measurement procedure was described in more detail elsewhere [4,5].Pressure from 15 to 50 GPa was produced with the use of a high pressure chamber (HPC) with anvils of the plane-rounded cone type [6,7], made from the carbonado type synthetic polycrystalline diamonds. These anvils are good electric conductors; this fact makes it possible to measure the pressure and tempera ture dependences of the resistance of a sample placed between the anvils, which are used as contacts. This procedure allowed us to cyclically change pressure applied to the sample. This makes it possible not only to study conductivity changes under changes in pres sure but also to analyze possible changes in the sample structure based on irreversible changes in electrical properties (the prehistory of the sample). The mea surements were performed in a temperature range of 77-400 K.Pressure was determined from the formula P = AF/πa 2 , where F is the applied force, а is the contact radius, and A is an empirical coefficient (in our case, Abstract-Kinetic effects in p ZnAs 2 were measured at hydrostatic ...

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Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

Pressure and temperature dependences in p-ZnAs2 at high pressures

Mollaev

Маренкин

Alibekov

et al. 2013

Russ. J. Inorg. Chem.

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“…The method used allows us to study the same sample at successively increasing and decreasing pressures. The estimation of pressure was proved to be accurate based on extensive studies of different materials over a wide range of temperatures and pressures [2,7]. The error in the estimation depends on mechanical properties of the compressed material and is less than 10% in the range 15-50 GPa.…”

Section: Methodsmentioning

confidence: 99%

Ammonium halides NH₄Cl, NH₄F, and NH₄Br

Тихомирова

Бабушкин

2003

Physica Status Solidi (b)

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PACS 72.60.+g, 81.40Vw The resistance of ammonium chloride (NH 4 Cl), fluoride (NH 4 F) and bromide (NH 4 Br) is investigated at pressures from 20 to 50 GPa in the temperature range 77 -400 K. The transition from high-resistance to low-resistance state was found at pressures of about 15 GPa for NH 4 Br, 27 GPa for NH 4 Cl, and 42 GPa for NH 4 F, respectively. The characteristic temperature and pressure of the transition are shown to depend on the duration of the pressure treatment. All the ammonium halides show metal-like behaviour under high pressures similar to that of alkali halides. The non-monotonic temperature dependence of the resistivity, which disappears after sufficiently long pressure treatment, indicates the existence of intermediate states.

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“…The pressure was derived from the expression P = AF/πa 2 , where F is the applied force, a is the radius of the contact area, and A is an empirical factor (in our case, A = 1.51). This method of pressure estimation was established for different materials over a wide range of temperatures and pressures [7,8]. The error in the estimation depends on mechanical properties of the compressed material and is no more than 10% of the measured pressure in the range 15 -50 GPa.…”

Section: Methodsmentioning

confidence: 99%

Conductivity of graphite and fullerene under pressures up to 50 GPa

Тихомирова

Бабушкин

2003

Physica Status Solidi (b)

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The DC resistance of polycrystalline fullerene C 60 and graphite in the temperature range 77 -450 K were studied at pressures up to 50 GPa. The AC measurements were performed at room temperature. The temperature and pressure dependences of resistance for both materials are of a similar character. However, the resistance of both materials is different by many orders of magnitude. It is shown that both fullerene and graphite keep some features of their original microscopic structure even at high pressures.

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The electrical conductivity and thermal electromotive force of lithium hydride and lithium deuteride at 20-50 GPa

Cited by 22 publications

References 10 publications

Pressure and temperature dependences in p-ZnAs2 at high pressures

Pressure and temperature dependences in p-ZnAs2 at high pressures

Ammonium halides NH₄Cl, NH₄F, and NH₄Br

Conductivity of graphite and fullerene under pressures up to 50 GPa

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The electrical conductivity and thermal electromotive force of lithium hydride and lithium deuteride at 20-50 GPa

Cited by 22 publications

References 10 publications

Pressure and temperature dependences in p-ZnAs2 at high pressures

Pressure and temperature dependences in p-ZnAs2 at high pressures

Ammonium halides NH4Cl, NH4F, and NH4Br

Conductivity of graphite and fullerene under pressures up to 50 GPa

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Product

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Ammonium halides NH₄Cl, NH₄F, and NH₄Br