Infrared spectroscopy and tunneling of protons in crystals with hydrogen bonds

Timokhin, V. M.; Гармаш, В. М.; Tedzhetov, Valentin A.

doi:10.1134/s0030400x17060224

Cited by 6 publications

(11 citation statements)

References 8 publications

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“…Thus pyroelectric current (maxima 1 and 2) dominates over weak relaxation current by 3-4 orders of magnitude. The activation energies (Table 1) calculated from the TSD spectra agree well with the activation energies calculated from infrared spectra [13,14].…”

Section: Resultssupporting

confidence: 72%

“…The conclusions made on the basis of the experimental TSD spectra are confirmed by analysis of the IR spectra [14] and electrical conductivity (Fig. 9).…”

Section: Resultssupporting

confidence: 61%

“…The use of the thermally stimulated depolarization current method allowed completely solving the tasks of this work and puts forward a technology for the diagnostics of anisotropy and optical axes in crystalline materials. The technology developed in this work is doubtlessly of interest for the fundamental research dealing with the tunneling effect and for various practical applications as a method of examining the quality of optical crystals at a sufficiently high scientific and technical level that was unachievable before, resulting in the consequent development of the method of optical diagnostics of optical axes and types of oscillation centers in crystals with hydrogen bonds [13,14].…”

Section: Discussionmentioning

confidence: 99%

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Technology of thermally stimulated diagnostics of anisotropy and optical axes in crystals

Timokhin¹,

Гармаш²,

Tedzhetov³

2020

MoEM

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For implementing the technology of thermally stimulated diagnostics of anisotropy and optical axes in crystals, the sample is thermostated at a temperature not exceeding the melting point, an electric field not exceeding the breakdown field is applied to the sample and polarization is produced for a time greater than the relaxation time at this temperature. After that, without switching off the electric field, the sample is cooled to the liquid nitrogen temperature, following which the field is switched off, the sample is linearly heated to a temperature above the polarization temperature and the resultant thermally stimulated depolarization (TSD) spectra taken along and perpendicular to the optical axis of the crystal are examined. When comparing the spectra the presence of anisotropy is detected and the direction of the optical axes is determined from the magnitude and presence of the TSD maxima.

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Section: Resultssupporting

confidence: 72%

“…The conclusions made on the basis of the experimental TSD spectra are confirmed by analysis of the IR spectra [14] and electrical conductivity (Fig. 9).…”

Section: Resultssupporting

confidence: 61%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Technology of thermally stimulated diagnostics of anisotropy and optical axes in crystals

Timokhin¹,

Гармаш²,

Tedzhetov³

2020

MoEM

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“…Поэтому протон легко может образовывать протонированные колебательные центры. Прозрачность барьера для прототипов можно определить по формуле (4) Для потенциального барьера шириной 0,12 нм и высотой 0,06 эВ прозрачность барьера для протонов, согласно приведенной выше формуле, составляет 0,0408 [13]. А, если учесть, что расстояние между ионами кислорода в тетраэдре SiO 4 4- Для воды полосы 0,41, 0,462 и 0,45 эВ могут быть отнесены к антисимметричным колебаниям ОН− группы.…”

Section: результаты эксперимента и их обсуждениеunclassified

Spectral diagnostics of vibrational centers in crystals with hydrogen bonds

Timokhin

Гармаш

Tedzhetov

2019

Izv. vysš. učebn. zaved., Mater. èlektron. teh.

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In practical application of crystals in optoelectronics and laser technology it is necessary to know the direction of optical axes and types of oscillatory centers, which is a relevant and necessary condition. In this paper, the infrared spectra of transmission and absorption of hexagonal crystals of lithium iodate α-LiIO3, grown by open evaporation in H2O and D2O solutions, as well as natural lamellar crystals of phlogopite and muscovite monoclinic crystal are investigated. The band gap width of the investigated crystals is determined by transmission spectra. In the absorption spectra there were determined activation energy and wavelength of the oscillatory centers that are associated with the vibrations of protons, hydronium ions Н3О+, protium H+, OH groups and molecules HDO. The good correlation of the parameters of infrared spectra with the spectra of thermally stimulated depolarization currents and NMR spectra has shown. The possibility of diagnostics of types of oscillatory centers by means of infrared spectra is considered, which also allows to find out the direction of optical axes. The obtained results allow to use IR spectra to determine not only the types of vibrational centers, but also the presence of anisotropy of the crystal lattice of the studied crystals.

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“…Следовательно, в данном случае пироэлектрический ток (максимумы №№ 1 и 2) перекрывает слабый релаксационный ток, превышая его на 3-4 порядка. В результате были получены значения энергии активации (таблица), хорошо коррелирующие со значениями, полученными по инфракрасным спектрам [13,14].…”

Section: определение энергии активацииunclassified

Technology for thermostimulated diagnostics of anisotropy and optical axes of crystals

Timokhin

Гармаш

Tedzhetov

2020

Izv. vysš. učebn. zaved., Mater. èlektron. teh.

Self Cite

View full text Add to dashboard Cite

To implement the technology of thermally stimulated diagnostics of anisotropy and optical axes of crystals, the sample is thermostated at a temperature not exceeding the melting point, an electric field not exceeding the breakdown field is applied to the sample, polarization is produced for a time greater than the relaxation time at this temperature. After that, without disconnecting the electric field, cooling to the temperature of liquid nitrogen is performed, then the field is switched off, the sample is linearly heated to a temperature above the polarization temperature and the obtained thermally stimulated depolarization (TSD) spectra taken along and perpendicular to the optical axis of the sixth order C6 crystal are examined. When comparing the obtained spectra, the presence of anisotropy is determined, and the exact direction of the optical axes is determined by the magnitude and presence of the TSD maxima.

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Infrared spectroscopy and tunneling of protons in crystals with hydrogen bonds

Cited by 6 publications

References 8 publications

Technology of thermally stimulated diagnostics of anisotropy and optical axes in crystals

Technology of thermally stimulated diagnostics of anisotropy and optical axes in crystals

Spectral diagnostics of vibrational centers in crystals with hydrogen bonds

Technology for thermostimulated diagnostics of anisotropy and optical axes of crystals

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