Reversible Martensitic Phase Transition in Yttrium-Stabilized ZrO2 Nanopowders by Adsorption of Water

Asgerov, E. B.; Beskrovnyy, A. I.; Doroshkevich, Nelya V.; Mîţă, Carmen; Mardare, Diana; Chicea, Dan; Lazăr, Mihaela D.; Tatarinova, Alisa A.; Lyubchik, Svetlana B.; Lyubchyk, Svitlana B.; Lyubchyk, Andriy; Doroshkevich, Aleksandr

doi:10.3390/nano12030435

Cited by 20 publications

(11 citation statements)

References 22 publications

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“…A similar situation occurs during relatively minor and typical flood events. Among the main reasons for this are: the progressive reduction in the capacity of drains to accumulate water masses due to numerous anthropogenic phenomena, such as largescale deforestation, drainage of wetlands, and the erosion of river floodplains by hydraulic structures; the large-scale use of areas at risk of flooding for economic purposes; the increase in the total number of floods caused by purely man-made factors, in particular accidents at water intake facilities; the significant reduction in the overall number of activities aimed at flood prevention and mitigation as a result of drastic cuts in funding [21][22][23][24][25].…”

Section: Discussionmentioning

confidence: 99%

Environmental Risk Assessment of Spring Floods in the Akmola Region of Kazakhstan

Aitzhanova,

Zhaparova

2023

IJSDP

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The relevance of the subject matter in this study is conditioned by a high degree of risk of spring floods in Akmola region, significant damage to the economy of the region and the need to develop and implement effective measures to counteract this natural situation. The purpose of the study is to develop a proper assessment of the environmental risk of spring floods and their consequences in the flooded areas of Akmola region. The methodological approach in this study is based on a combination of system analysis methods. They analyse the degrOctober 2023ee of probability of various kinds of environmental risks caused by spring floods and investigate the regularities of development of negative consequences of floods as a whole and in Akmola Region of the Republic of Kazakhstan in particular. In the course of this study, findings have been made indicating the serious consequences of spring floods for economic activity in the areas affected by seasonal flooding of water bodies. The findings also indicate the need to develop and implement specific measures to prevent spring floods caused by serious disturbances to economic activity in water protection zones. The findings of this study and the scientific conclusions drawn from them are of significant practical significance for agricultural workers in Akmola region, who have to cope with the consequences of spring floods in the area where they operate.

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Section: Discussionmentioning

confidence: 99%

Environmental Risk Assessment of Spring Floods in the Akmola Region of Kazakhstan

Aitzhanova,

Zhaparova

2023

IJSDP

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“…The crystal structure of the defects was determined from electronographic images obtained using TEM. Detailed studies of the structure of the nanopowders used are given in [ 15 ]. The electrical properties of the samples were studied by electrochemical impedance spectroscopy (EIS).…”

Section: Methodsmentioning

confidence: 99%

“…The amplitude of the alternating exciting signal is 50 mV, the frequency range is 50 Hz–1 MHz, and the measurement time of one point is 5 s. The calculation of the impedance parameters was carried out using a computer program [ 18 , 19 ]. The methodology of EIS studies of the NODS in the author’s version is described in detail in [ 11 , 15 , 20 , 21 ].…”

Section: Methodsmentioning

confidence: 99%

Electric Energy Storage Effect in Hydrated ZrO2-Nanostructured System

et al. 2022

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The dimensional effect of electric charge storage with a density of up to 270 μF/g by the hydrated ZrO2-nanoparticles system was determined. It was found that the place of localization of different charge carriers is the generalized heterophase boundary-nanoparticles surface. The supposed mechanism of the effect was investigated using the theory of dispersed systems, the band theory, and the theory of contact phenomena in semiconductors, which consists of the formation of localized electronic states in the nanoparticle material due to donor–acceptor interaction with the adsorption ionic atmosphere. The effect is relevant for modern nanoelectronics, microsystem technology, and printed electronics because it allows overcoming the basic physical restrictions on the size, temperature, and operation frequency of the device, caused by leakage currents.

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“…Understanding these features make it possible to tune the Fermi energies in the band structure for specific tasks in modern materials science and instrumentation. The results obtained will help to interpret some of the features of the electronic properties of ZrO2 and solid materials [32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48], and also complement the base of scientific work carried out in the field of using biocompatible zirconium dioxide crystals and ceramics for generating green energy. The data can be used in the design of moisture-to-electricity converters and the creation of solid oxide fuels.…”

Section: Stabilization Of M-zro2 and Electronic Properties Of Yszmentioning

confidence: 99%

Study on Structural Stability of ZrO<sub>2</sub> and YSZ: Doping-Induced Phase Transitions and Fermi Level Shift

Nematov,

Burkhonzoda,

Kholmurodov

et al. 2023

Preprint

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In this study, we considered the structural stability, electronic properties, and phonon dispersion of the cubic (c-ZrO2), tetragonal (t-ZrO2), and monoclinic (m-ZrO2) phases of ZrO2. We found that the monoclinic phase of zirconium dioxide is the most stable among the three phases in terms of total energy, lowest enthalpy, highest entropy, and other thermodynamic properties. The smallest negative modes were found for m-ZrO2. Our analysis of the electronic properties showed that during the m–t phase transformation of ZrO2, the Fermi level first shifts by 0.125 eV toward higher energies and then decreases by 0.08 eV in the t–c cross-section. The band gaps for c-ZrO2, t-ZrO2, and m-ZrO2 are 5.140 eV, 5.898 eV, and 5.288 eV, respectively. Calculations based on the analysis of the influence of doping 3.23, 6.67, 10.35, and 16.15 mol. %Y2O3 onto the m-ZrO2 structure showed that the enthalpy of m-YSZ decreases linearly, which accompanies further stabilization of monoclinic ZrO2 and an increase in its defectiveness. In this case, the position of the Fermi level changes abruptly, and the energy gap decreases. It has been established that, not only for pure systems but including those doped with Y2O3, the main contribution to the formation of the conduction band is made by the p-states of electrons. The t-ZrO2 (101) and t-YSZ (101) surface models were selected as optimal surfaces for water adsorption based on a comparison of their surface energies. An analysis of the mechanism of water adsorption on the surface of t-ZrO2 (101) and t-YSZ (101) showed that H2O on unstabilized t-ZrO2 (101) is adsorbed dissociatively with an energy of -1.22 eV, as well as by the method of molecular chemisorption with an energy of - 0.69 eV and the formation of a hydrogen bond with a bond length of 1.01 Å. In the case of t-YSZ (101), water is molecularly adsorbed onto the surface with an energy of -1.84 eV. Dissociative adsorption of water occurs at an energy of -1.23 eV, near the yttrium atom. The obtained results complement the database of research works carried out in the field of the application of biocompatible zirconium dioxide crystals and ceramics in green energy generation and can be used in designing humidity-to-electricity converters and creating solid oxide fuel cells based on ZrO2.

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Reversible Martensitic Phase Transition in Yttrium-Stabilized ZrO2 Nanopowders by Adsorption of Water

Cited by 20 publications

References 22 publications

Environmental Risk Assessment of Spring Floods in the Akmola Region of Kazakhstan

Environmental Risk Assessment of Spring Floods in the Akmola Region of Kazakhstan

Electric Energy Storage Effect in Hydrated ZrO2-Nanostructured System

Study on Structural Stability of ZrO<sub>2</sub> and YSZ: Doping-Induced Phase Transitions and Fermi Level Shift

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