Relevant bibliographies by topics / Superionic phase

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Superionic phase'

Author: Grafiati
Published: 28 May 2022
Last updated: 29 May 2022

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Journal articles on the topic "Superionic phase"

1

Kimura, Tomoaki, and Motohiko Murakami. "Fluid-like elastic response of superionic NH3 in Uranus and Neptune." Proceedings of the National Academy of Sciences 118, no. 14 (March 29, 2021): e2021810118. http://dx.doi.org/10.1073/pnas.2021810118.

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Nondipolar magnetic fields exhibited at Uranus and Neptune may be derived from a unique geometry of their icy mantle with a thin convective layer on top of a stratified nonconvective layer. The presence of superionic H2O and NH3 has been thought as an explanation to stabilize such nonconvective regions. However, a lack of experimental data on the physical properties of those superionic phases has prevented the clarification of this matter. Here, our Brillouin measurements for NH3 show a two-stage reduction in longitudinal wave velocity (Vp) by ∼9% and ∼20% relative to the molecular solid in the temperature range of 1,500 K and 2,000 K above 47 GPa. While the first Vp reduction observed at the boundary to the superionic α phase was most likely due to the onset of the hydrogen diffusion, the further one was likely attributed to the transition to another superionic phase, denoted γ phase, exhibiting the higher diffusivity. The reduction rate of Vp in the superionic γ phase, comparable to that of the liquid, implies that this phase elastically behaves almost like a liquid. Our measurements show that superionic NH3 becomes convective and cannot contribute to the internal stratification.
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Machado, K. D., J. C. de Lima, T. A. Grandi, C. E. M. Campos, C. E. Maurmann, A. A. M. Gasperini, S. M. Souza, and A. F. Pimenta. "Structural study of Cu2−x Se alloys produced by mechanical alloying." Acta Crystallographica Section B Structural Science 60, no. 3 (May 17, 2004): 282–86. http://dx.doi.org/10.1107/s0108768104007475.

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The crystalline structures of the superionic high-temperature copper selenides Cu2−x Se (0 < x < 0.25) produced using mechanical alloying were investigated using X-ray diffraction (XRD). The measured XRD patterns showed the presence of peaks corresponding to the crystalline superionic high-temperature α-Cu2Se phase in the as-milled sample, and its structural data were determined by means of a Rietveld refinement procedure. After heat treatment in argon at 473 K for 90 h, this phase transforms to the superionic high-temperature α-Cu1.8Se phase, whose structural data were also determined by Rietveld refinement. In this phase, a very low occupation of the trigonal 32(f) sites (∼ 3%) by Cu ions is found. In order to explain the evolution of the phases in the samples, two possible mechanisms are suggested: (i) the high mobility of Cu ions in superionic phases and (ii) the important diffusive processes in the interfacial component of samples produced by mechanical alloying.
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Schwarz, Maximilian, Alf Mews, and August Dorn. "Superionic phase transition in individual silver selenide nanowires." Nanoscale 13, no. 17 (2021): 8017–23. http://dx.doi.org/10.1039/d1nr00491c.

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The superionic phase transition temperature in Ag2Se nanowires is diameter dependent and suppressed to below 100 °C. An increase in charge carrier density accompanied by a decrease in mobility was observed across the superionic phase transition.
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Schneider, Julius, and Wolfgang Schmahl. "Superionic phase transitions in anti-fluorite structures." Acta Crystallographica Section A Foundations and Advances 70, a1 (August 5, 2014): C72. http://dx.doi.org/10.1107/s2053273314099276.

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Fast ion conductors attract continuous and increasing interest in view of possible applications in battery technology. Early examples of superionic phase transitions in anti-fluorite type structures, where the small cations reside in a tetrahedral cage of large anions include Ag2Te [1]. At elevated temperatures anharmonic atom thermal displacements induce cation diffusion towards the large void formed by the central anion octahedron. Of the anti-fluorite structure type compounds Li2 X, where X=(O, S, Se, Te), the compounds Li2O and Li2S showed diffuse transitions to a superionic phase. Very recent advances in battery technology of these compounds [2] motivated us to investigate the end member Li2Te [3] by temperature dependent neutron powder diffraction. The quasi-harmonic temperature dependence of the Li thermal displacement factor shows a distinct steepening of slope around 4000C, indicating a phase transition to a superionic phase. Analysis of derived probability density functions and atom potentials again reveal a corresponding increase of anharmonic, anisotropic Li-ion motion towards the octahedral void. This indicates opening up of Li-ion diffusion pathways at the phase transition. The superionic phase transitions of the Li2X anti-fluorite type structures are steered by their cation-anion distance ratio, which in turn determines their respective transition temperatures. The superionic phase transitions mark the onset of cation sublattice melting, where these transition temperatures are proportional to the melting temperatures of the entire compounds.
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Raze, Rizwan, Xiao Di Wang, Ying Ma, Yi Zhong Huang, and Bin Zhu. "Enhancement of Conductivity in Ceria-Carbonate Nanocomposites for LTSOFCs." Journal of Nano Research 6 (June 2009): 197–203. http://dx.doi.org/10.4028/www.scientific.net/jnanor.6.197.

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This work first explores high resolution transmission electron microscopy (TEM) to determine the interfacial regions and provide experimental evidences for interfaces between the SDC and carbonate constituent phases of the SD-carbonate two-phase composites to further investigate the superionic conduction mechanism in the ceria-carbonate composite systems and enhancement of conductivity. Schober first reported interfacial superionic conduction in ceria-based composites but without direct experimental proofs. Such superionic conduction mechanism remains unknown. Especially, in the nano-scale, this region is trifle to be detected.
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Fedoseev, A. I., S. G. Lushnikov, J. H. Ko, Seiji Kojima, and L. A. Shuvalov. "Specific Features of Brillouin Spectra at a High-Temperature Phase Transition in Cs5H3(SO4)4xnH2O Crystals." Solid State Phenomena 115 (August 2006): 279–84. http://dx.doi.org/10.4028/www.scientific.net/ssp.115.279.

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This paper presents detailed Brillouin light scattering studies of the acoustic response of a Cs5H3(SO4)4xnH2O (PCHS) crystal in the vicinity of a superionic (superprotonic) structural phase transition of the first order. Just above the phase transition, splitting of the Brillouin doublet is observed. The ‘two-mode’ behavior of the longitudinal acoustic phonon can be explained by coexistence of phases at a structural phase transition of the first order. Above the phase transition, in the superionic phase, an additional doublet forbidden by the selection rules appears in a narrow temperature interval. It is concluded that an anomalous behavior of Brillouin light scattering can be attributed to the influence of dynamically disordered protons on the phonon subsystem.
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den Hartog, H. W., and J. van der Veen. "Superionic phase transition of doped fluorites." Physical Review B 37, no. 4 (February 1, 1988): 1807–13. http://dx.doi.org/10.1103/physrevb.37.1807.

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Aliev, A. É., V. F. Krivorotov, and P. K. Khabibullaev. "Specific heat and thermal conductivity of superionic conductors in the superionic phase." Physics of the Solid State 39, no. 9 (September 1997): 1378–82. http://dx.doi.org/10.1134/1.1130083.

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Berastegui, P., S. Hull, and S. G. Eriksson. "A high temperature superionic phase of CsSn2F5." Journal of Solid State Chemistry 183, no. 2 (February 2010): 373–78. http://dx.doi.org/10.1016/j.jssc.2009.11.020.

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Sakuma, Takashi, Fumihito Suzuki, Shoji Saitoh, Kazumasa Sugiyama, Eiichiro Matsubara, and Yoshio Waseda. "Diffuse Scattering of Superionic Phase of Cu2Se." Journal of the Physical Society of Japan 62, no. 10 (October 15, 1993): 3513–18. http://dx.doi.org/10.1143/jpsj.62.3513.

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Dissertations / Theses on the topic "Superionic phase"

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Madamba, Maria Cecilia S. "Phase transitions in superionic PbSnF¦4." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ39072.pdf.

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Džiaugys, Andrius. "Influence of impurities on dielectric properties of ferroelectric and superionic crystals." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2011. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2011~D_20110628_134612-56944.

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Nowadays the ferroelectrics containing of several feroically active sublattices are very attractive, because interactions between these sublattices can caused novel phenomena. Antiferroelectrics, ferrielectrics and multiferoics belong to these materials. In this work new crystalline materials MNP2X6 (M = Cu, Ag; N=In, Cr, Bi; X=S, Se) were investigated, which have ferrielectric and multiferoic properties. The dielectric and electric properties of above mentioned materials have been investigated by broadband dielectric spectroscopy methods, which allows to analyze the collective processes related to order – disorder and displacive phase transitions, ions migration and freezing of dipoles (glassy state) in wide temperature (25 K - 500 K) and frequency (10-5 HZ - 3 GHz) ranges. By substitution or doping it becomes possible to tailor the ferroelectric materials to different properties. In this work is determined that the substitution of 10% Cu ions by Ag ions shifts the phase transition temperature of CuInP2S6 crystal toward lower temperatures while the addition of In ions shifts the phase transitions temperature toward the higher ones. The phase transition temperature difference is about 50 K for mentioned crystals. If the ferroelectric crystal CuInP2S6 is mixed with the antiferroelectric CuCrP2S6 the dipole glass phase occupies the middle of the phase diagram. The distribution of relaxation times has been calculated from the broadband dielectric spectra of dipolar glasses. The... [to full text]
Šiai dienai ypač populiarūs ferroelektrikai susidedantys iš kelių feroiškai aktyvių subgardelių, kurių persitvarkymas fazinio virsmo temperatūroje atskleidžia naujų, dar neaprašytų reiškinių. Prie šių medžiagų priskiriami antiferoelektrikai, ferielektrikai ir multiferoikai. Šiame darbe buvo tiriama nauja medžiagų šeimos MNP2X6 (M = Cu, Ag; N=In, Cr, Bi; X=S, Se ), kurios pasižymi ferielektrinėmis bei multiferoinėmis savybėmis, ir kurių dielektrines ir elektrines savybes galima efektyviai keisti įvedant priemaišas. Minėtų medžiagų dielektrinės ir elektrinės savybės buvo tiriamos dielektrinės spektroskopijos metodais, kurie leidžia tirti kristalų kolektyvinius reiškinius susijusius su tvarkos – netvarkos bei poslinkio tipo faziniais virsmais, jonų migracija bei dipolių užšalimu (stiklėjimu) plačiame dažnių (10-5 Hz iki 3 GHz) bei temperatūrų (25 K iki 500 K) intervaluose. Įvedus 10% Ag jonų vietoj Cu jonų ferielektriniame kristale CuInP2S6 fazinio virsmo temperatūra pasislenka į žemesnias temperatūras, o padidinus indžio koncentraciją fazinio virsmo temperatūra pasislenka į aukštesnes temperatūras. Minėtų kristalų fazinių virsmų temperatūrų skirtumas 50 K. Sumaišius skirtingomis proporcijomis feroelektriką (CuInP2S6) su antiferoelektriku (CuCrP2S6) stebima dipolinio stiklo fazė. Iš dielektrinių matavimų stiklo fazėje buvo paskaičiuota relaksacijos trukmių pasiskirstymo funkcija, kurios aprašymas dvigubos potencialinės duobės modeliu leido susieti mikroskopinius kristalo... [toliau žr. visą tekstą]
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Gardner, N. J. G. "Structure and dynamics of superionic conductors at high temperatures and high pressures." Thesis, University of Oxford, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325955.

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4

Мороз, М. В., М. В. Прохоренко, Б. П. Рудик, Б. Д. Нечипорук, and Л. В. Соляк. "Термодинамічні властивості суперіонної фази Ag3SBr." Thesis, Сумський державний університет, 2015. http://essuir.sumdu.edu.ua/handle/123456789/40665.

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Hernandez, Jean-Alexis. "Ab initio modeling of dense water ices at extreme conditions of pressure and temperature." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEN028/document.

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Dans cette thèse, nous étudions la stabilité et les propriétés des glaces d’eau de haute pression (entre 5 et 300 GPa) et de haute température (entre 300 et 2000 K) comportant ou non des inclusions de NaCl dans leur structure cristalline. Pour attendre ces conditions propres aux intérieurs des exoplanètes océans, nous utilisons une approche théorique basée sur des dynamiques moléculaires ab initio. Nous montrons que l’analyse de la dynamique des liaisons entre hydrogènes et oxygènes permet de distinguer toutes les phases de la glace présentant une structure cubique volume-centrée. En particulier, nous présentons la première description ab initio de la phase plastique, et nous mettons en évidence la présence de multiples transitions dans la phase superionique. Ensuite, nous montrons que jusqu’à 5.9 % en masse de NaCl peuvent être inclus dans la structure de la glace à 1600 K. L’inclusion des ions Na+ et Cl- stimule le désordre orientationel des molécules d’eau par rapport à la glace d’eau pure. À partir de 2.5 % en masse de NaCl, la conduction superionique s’étend à l’ensemble de la gamme de pression étudiée, et la symétrisation des liaisons hydrogènes se produit à plus haute pression. Enfin, nous décrivons les structures de cœur des dislocations vis ayant des vecteurs de Burgers <110> et <111> dans la glace X à 80 GPa, ce qui constitue une étape préliminaire importante à la construction de lois rhéologiques pour les glaces cubiques de haute pression
In this thesis we study the stability and the properties of pure and NaCl-bearing dense water ices at high pressure (between 5 and 300 GPa) and high temperature (between 300 and 2000 K). To reach these conditions that correspond to the interiors of ocean exoplanets, we employ a theoretical approach based on ab initio molecular dynamics simulations. We show that a detailed analysis of the hydrogen bond dynamics allows to distinguish all the different ice phases presenting a body-centered cubic sub-lattice of oxygen atoms. In particular, we present the first ab initio description of the plastic phase of water ice. We also reveal the multiple transitions that occur in the superionic domain. Next, we show that ice VII' can incorporate up to 5.9 wt% NaCl in its structure at 1600 K. The inclusion of Na+ and Cl- ions enhances the orientation disorder of the water molecules in comparison to the pure ice. From 2.5 wt% NaCl, superionic conduction expands over the entire pressure range studied, and the hydrogen symmetrisation is shifted towards higher pressures. Last, we describe the <110> and <111> screw dislocation core structures of ice X at 80 GPa. This constitutes a first step towards the construction rheological laws for high-pressure cubic ices
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Džiaugys, Andrius. "Priemaišų įtaka feroelektrinių ir superjoninių kristalų dielektrinėms savybėms." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2011. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2011~D_20110628_134724-71267.

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Šiai dienai ypač populiarūs ferroelektrikai susidedantys iš kelių feroiškai aktyvių subgardelių, kurių persitvarkymas fazinio virsmo temperatūroje atskleidžia naujų, dar neaprašytų reiškinių. Prie šių medžiagų priskiriami antiferoelektrikai, ferielektrikai ir multiferoikai. Šiame darbe buvo tiriama nauja medžiagų šeimos MNP2X6 (M = Cu, Ag; N=In, Cr, Bi; X=S, Se ), kurios pasižymi ferielektrinėmis bei multiferoinėmis savybėmis, ir kurių dielektrines ir elektrines savybes galima efektyviai keisti įvedant priemaišas. Minėtų medžiagų dielektrinės ir elektrinės savybės buvo tiriamos dielektrinės spektroskopijos metodais, kurie leidžia tirti kristalų kolektyvinius reiškinius susijusius su tvarkos – netvarkos bei poslinkio tipo faziniais virsmais, jonų migracija bei dipolių užšalimu (stiklėjimu) plačiame dažnių (10-5 Hz iki 3 GHz) bei temperatūrų (25 K iki 500 K) intervaluose. Įvedus 10% Ag jonų vietoj Cu jonų ferielektriniame kristale CuInP2S6 fazinio virsmo temperatūra pasislenka į žemesnias temperatūras, o padidinus indžio koncentraciją fazinio virsmo temperatūra pasislenka į aukštesnes temperatūras. Minėtų kristalų fazinių virsmų temperatūrų skirtumas 50 K. Sumaišius skirtingomis proporcijomis feroelektriką (CuInP2S6) su antiferoelektriku (CuCrP2S6) stebima dipolinio stiklo fazė. Iš dielektrinių matavimų stiklo fazėje buvo paskaičiuota relaksacijos trukmių pasiskirstymo funkcija, kurios aprašymas dvigubos potencialinės duobės modeliu leido susieti mikroskopinius kristalo... [toliau žr. visą tekstą]
Nowadays the ferroelectrics containing of several feroically active sublattices are very attractive, because interactions between these sublattices can caused novel phenomena. Antiferroelectrics, ferrielectrics and multiferoics belong to these materials. In this work new crystalline materials MNP2X6 (M = Cu, Ag; N=In, Cr, Bi; X=S, Se) were investigated, which have ferrielectric and multiferoic properties. The dielectric and electric properties of above mentioned materials have been investigated by broadband dielectric spectroscopy methods, which allows to analyze the collective processes related to order – disorder and displacive phase transitions, ions migration and freezing of dipoles (glassy state) in wide temperature (25 K - 500 K) and frequency (10-5 HZ - 3 GHz) ranges. By substitution or doping it becomes possible to tailor the ferroelectric materials to different properties. In this work is determined that the substitution of 10% Cu ions by Ag ions shifts the phase transition temperature of CuInP2S6 crystal toward lower temperatures while the addition of In ions shifts the phase transitions temperature toward the higher ones. The phase transition temperature difference is about 50 K for mentioned crystals. If the ferroelectric crystal CuInP2S6 is mixed with the antiferroelectric CuCrP2S6 the dipole glass phase occupies the middle of the phase diagram. The distribution of relaxation times has been calculated from the broadband dielectric spectra of dipolar glasses. The... [to full text]
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Madamba, Maria Cecilia S. "Phase transitions in superionic PbSnF₄." Thesis, 1998. http://spectrum.library.concordia.ca/664/1/MQ39072.pdf.

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PbSnF$\sb4$ is the highest performance fluoride ion conductor known to date. We have studied the phase transitions it undergoes under three different conditions: (i) versus the amount of hydrofluoric acid used for the preparation by the aqueous route, (ii) upon application of mechanical energy, and (iii) versus temperature. The addition of an aqueous solution of lead(II) nitrate to a fresh aqueous solution of SnF$\sb2$ results in the precipitation of $\alpha$-PbSnF$\rm\sb4(aq\sb1$), which is very highly strained in the ($\vec a,\vec b$) plane of the tetragonal unit-cell. If a very minor amount of hydrofluoric acid is used, the strain increases and o-PbSnF$\sb4$ is obtained. The $\alpha$-PbSnF$\sb4\to$ o-$\rm PbSnF\sb4$ transition is mostly a bidimensional phase transition, which includes a highly disordered intermediate "transitional phase". Ball milling results in a phase transition, giving microcrystalline disordered $\mu\gamma$-PbSnF$\sb4$, a cubic $\beta$-PbF$\sb2$ like phase. Tests were performed to make sure the $\mu\gamma$-PbSnF$\sb4$ samples are indeed microcrystalline cubic PbSnF$\sb4$ and not a mixture of microcrystalline $\beta$-PbF$\sb2$ and amorphous SnF$\sb2$. Milling $\alpha$- and $\beta$-PbF$\sb2$ for comparison and testing showed that both $\beta\to\alpha$ and $\alpha\to\beta$ transitions take place upon milling. Stirring $\alpha$-PbF$\sb2$ in an aqueous solution of SnF$\sb2$ results in the formation of $\rm\alpha$-PbSnF$\rm\sb4(aq\sb2)$ or $\rm Pb\sb2SnF\sb6$ depending on the conditions whereas no reaction occurs with $\beta$-PbF$\sb2$. When all the phases of PbSnF$\sb4$ are heated, phase changes take place versus temperature and time. Our findings provide key knowledge that will have to be taken into account in the fabrication of practical devices using PbSnF$\sb4$ for guaranteed reproducible results, long term stability and stable output of the device.
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Brown, David Ross. "Enhanced Thermoelectric Performance at the Superionic Phase Transitions of Mixed Ion-Electron Conducting Materials." Thesis, 2015. https://thesis.library.caltech.edu/8631/66/Brown_DR_2015.pdf.

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The quality of a thermoelectric material is judged by the size of its temperature de- pendent thermoeletric-figure-of-merit (zT ). Superionic materials, particularly Zn4Sb3 and Cu2Se, are of current interest for the high zT and low thermal conductivity of their disordered, superionic phase. In this work it is reported that the super-ionic materials Ag2Se, Cu2Se and Cu1.97Ag0.03Se show enhanced zT in their ordered, normal ion-conducting phases. The zT of Ag2Se is increased by 30% in its ordered phase as compared to its disordered phase, as measured just below and above its first order phase transition. The zT ’s of Cu2Se and Cu1.97Ag0.03Se both increase by more than 100% over a 30 K temperatures range just below their super-ionic phase transitions. The peak zT of Cu2Se is 0.7 at 406 K and of Cu1.97Ag0.03Se is 1.0 at 400 K. In all three materials these enhancements are due to anomalous increases in their Seebeck coefficients, beyond that predicted by carrier concentration measurements and band structure modeling. As the Seebeck coefficient is the entropy transported per carrier, this suggests that there is an additional quantity of entropy co-transported with charge carriers. Such co-transport has been previously observed via co-transport of vibrational entropy in bipolaron conductors and spin-state entropy in NaxCo2O4. The correlation of the temperature profile of the increases in each material with the nature of their phase transitions indicates that the entropy is associated with the thermodynamcis of ion-ordering. This suggests a new mechanism by which high thermoelectric performance may be understood and engineered.
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Kostadinova, Ofeliya. "Raman spectroscopic study and dynamic properties of chalcogenide glasses and liquids." Thesis, 2009. http://nemertes.lis.upatras.gr/jspui/handle/10889/4095.

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Abstract:
Chalcogenide glasses (ChGs) are produced by alloying together a “chalcogen” element” (S, Se or Te) with other elements, generally from group V (Sb, As) or group IV (Ge, Si) to form covalently bonded solids. A variety of stable non-crystalline materials can be prepared in bulk, fiber, and thin film forms using melt-quenching, vacuum deposition, and other less common techniques. Being amorphous semiconductors, ChGs exhibit a variety of photo-induced phenomena when irradiated with proper light and therefore find a wide range of technological applications (optical data storage, telecommunications, IR optics, etc). As research in this field is strongly driven by the needs of high-tech industry, physical properties related to the applications are more systematically investigated than the atomic structure, which is ultimately related to the macroscopic properties. A shortcoming of not having yet established microstructure-properties relations in ChGs is the lack of a strategic design of new materials for specific applications. The present study is a systematic investigation of properties for various families of ChGs using experimental techniques that probe structure (near infrared Raman scattering, x-ray and neutron diffraction, EXAFS), dynamics (IR-Photon correlation spectroscopy), thermal properties (differential scanning calorimetry) and glass morphology (scanning electron microscopy). Particular emphasis is given on binary and pseudo-ternary ChGs, which are the basis of more complex multi-component glasses, such as As-Se, Sb-Se, As-Te, Ge-S, Ge-S-AgI, As-Se-AgI, As-Se-Ag, As-S-AgI, As-S-Ag etc. over a wide glass composition range. The binary systems are known for their significant optical properties while the Ag-doped glasses belong to the class of superionic conductors. Although some of these glass-forming systems have been extensively studied in the literature, several details concerning the atomic arrangement are still not fully understood, partly due to that some of these glasses are phase separated at the microscale; a fact that is usually overlooked in related studies. In the present study, using high-resolution off-resonant Raman conditions and a more elaborate analysis of the Raman spectra, in conjunction with thermal and morphological data, we have been able to obtain a better understanding of atomic structure and to advance structure-properties relations for both the homogeneous and phase separated glasses.
Μια κατηγορία υαλωδών υλικών, γνωστή ως χαλκογονούχες ύαλοι αρχίζει να κερδίζει σημαντικό έδαφος στον τομέα των εφαρμογών λόγω των φωτονικών ιδιοτήτων που διαθέτουν. Ως χαλκογονούχες ύαλοι θεωρούνται οι υαλώδεις ενώσεις στις οποίες ένα τουλάχιστον περιέχει ένα από τα στοιχεία χαλκογόνων S, Se, και Te. Η ανάμιξη των στοιχείων αυτών με στοιχεία όπως Sb, As, Ge, Si, κλ.π. οδηγεί στο σχηματισμό σταθερών ομοιοπολικών υαλωδών ενώσεων. Το γεγονός ότι οι χαλκογονούχες ύαλοι είναι άμορφοι ημιαγωγοί έχει ως αποτέλεσμα την εμφάνιση πλήθους φωτο-επαγόμενων φαινομένων όταν οι ενώσεις αυτές ακτινοβοληθούν με φως κατάλληλου μήκους κύματος (συγκρίσιμο με το ενεργειακό τους χάσμα). Οι φωτο-επαγόμενες αλλαγές απορρέουν από τις αλλαγές οι οποίες επέρχονται στην ατομική δομή του υλικού (φωτο-δομικές αλλαγές). Τα φωτο-επαγόμενα φαινόμενα είναι εκμεταλλεύσιμα σε πλήθος τεχνολογικών εφαρμογών, για παράδειγμα στην οπτική αποθήκευση πληροφορίας (DVD), σε οπτικά που λειτουργούν στο υπέρυθρο, στις τηλεπικοινωνίες κλπ. Καθώς η έρευνα πάνω στο εν λόγω επιστημονικό πεδίο καθορίζεται σε μεγάλο βαθμό από τις ανάγκες για βιώσιμες τεχνολογικές εφαρμογές, οι φυσικές ιδιότητες, οι οποίες σχετίζονται άμεσα με τις εφαρμογές, έχουν μελετηθεί εντατικότερα και πιο συστηματικά από την ατομική δομή η οποία είναι κατά βάση υπεύθυνη για τα φωτο-επαγόμενα φαινόμενα. Αυτό έχει ως μειονέκτημα την απουσία συσχετισμών μεταξύ μικροσκοπικών και μακροσκοπικών ιδιοτήτων με αποτέλεσμα την απουσία στρατηγικού σχεδιασμού νέων λειτουργικών υλικών με τις επιθυμητές ιδιότητες. Η παρούσα διατριβή περιλαμβάνει μια συστηματική μελέτη διαφόρων οικογενειών χαλκογονούχων υάλων με τη χρήση πειραματικών τεχνικών οι οποίες διερευνούν την ατομική δομή (σκέδαση Raman, περίθλαση ακτίνων-X και νετρονίων, EXAFS), τις θερμικές ιδιότητες (διαφορική θερμιδομετρία σάρωσης) και την μορφολογία των υάλων (ηλεκτρονική μικροσκοπία σάρωσης). Ιδιαίτερη έμφαση δόθηκε σε δυαδικά και ψευδο-δυαδικά συστήματα χαλκογονούχων υάλων τα οποία συμπεριλαμβάνουν As-Se, Sb-Se, As-Te, Ge-S, Ge-S-AgI, As-Se-AgI, As-Se-Ag, As-S-AgI, As-S-Ag κλπ. για μεγάλο εύρος συστάσεων της κάθε οικογένειας. Τα δυαδικά συστήματα είναι γνωστά για τις εξαίρετες οπτικές τους ιδιότητες ενώ οι ύαλοι με προσμίξεις Αργύρου ανήκουν στην κατηγορία των υπεριοντικών υάλων με αρκετά υψηλές ιοντικές αγωγιμότητες που χαρακτηρίζονται από μικροσκοπικό διαχωρισμό φάσεων σε συγκεκριμένες συγκεντρώσεις του Αργύρου. Παρά το γεγονός ότι ορισμένα από τα προαναφερθέντα άμορφα υλικά έχουν κατ’ επανάληψη μελετηθεί στο παρελθόν, ακριβείς πληροφορίες σχετικά με την ατομική δομή τους δεν είναι διαθέσιμες, εν μέρει εξ’ αιτίας της ελλιπούς πειραματικής προσέγγισης και εν μέρει λόγω του μικροσκοπικού διαχωρισμού φάσεων που χαρακτηρίζει τις υάλους με πρόσμιξη Αργύρου, γεγονός το οποίο συχνά αμελείται σε προγενέστερες μελέτες. Στην παρούσα διατριβή, χρησιμοποιώντας τη φασματοσκοπία σκέδασης Raman υψηλής ανάλυσης και μακριά από συνθήκες συντονισμού, σε συνδυασμό με θερμικά και μορφολογικά δεδομένα των υάλων, κατέστη δυνατό να αποκτηθεί μια πιο σφαιρική γνώσης σχετικά με την ατομικής κλίμακας δομή των υάλων και να προαχθούν συσχετισμοί δομής-ιδιοτήτων τόσο για ομοιογενή όσο και για ανομοιογενείς υάλους.
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Book chapters on the topic "Superionic phase"

1

Xiao, Chong. "Superionic Phase Transition Optimizing Thermoelectric Performance in Silver Chalcogenide Nanocrystals." In Springer Theses, 35–49. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-49617-6_2.

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2

Minami, Tsutomu, and Masahiro Tatsumisago. "Occurrence of High-Temperature α-Phase of AgI at Room Temperature in Superionic AgI-Ag2O-MXOy Glasses." In New Materials, 149–69. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-662-08970-5_7.

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3

Yakshibaev, R. A., N. N. Mukhamadeeva, and R. F. Almukhametov. "Phase Transformations and Ionic Transport in the Cu2 — 3Te Superionic Conductor." In July 1988, 135–42. De Gruyter, 1988. http://dx.doi.org/10.1515/9783112501306-012.

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4

"Microwave and Ultrasonic Investigations of Superionic Phase Transitions in CsDSO4 and CsDSeO4." In December 16, 429–36. De Gruyter, 1988. http://dx.doi.org/10.1515/9783112480786-013.

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5

Matsunaga, Shigeki. "Distribution Difference of Ag and Cu Ions in the Superionic Conductive Phase of AgBr-CuBr System: An Approach towards Molecular Dynamics Simulation." In Newest Updates in Physical Science Research Vol. 11, 1–9. Book Publisher International (a part of SCIENCEDOMAIN International), 2021. http://dx.doi.org/10.9734/bpi/nupsr/v11/10486d.

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6

Aliev, A. E., A. Sh Akramov, L. N. Fershtat, and P. K. Khabibullaev. "Mechanism of a Superion Phase Transition in a-LiIO3." In July 1988, 189–96. De Gruyter, 1988. http://dx.doi.org/10.1515/9783112501306-019.

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Conference papers on the topic "Superionic phase"

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Swain, Diptikanta, Venkata Srinu Bhadram, Gopal K. Pradhan, Chandrabhas Narayana, P. M. Champion, and L. D. Ziegler. "Superionic Phase Transition in KHSO[sub 4]." In XXII INTERNATIONAL CONFERENCE ON RAMAN SPECTROSCOPY. AIP, 2010. http://dx.doi.org/10.1063/1.3482698.

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SHIMOYAMA, TOMOTAKA, MASAJI ARAI, and TAKASHI SAKUMA. "CRYSTAL STRUCTURE OF THE SUPERIONIC PHASE OF CuAgSe." In Proceedings of the 1st International Discussion Meeting. WORLD SCIENTIFIC, 2007. http://dx.doi.org/10.1142/9789812706904_0005.

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Akdere, Ünsal, and Seçkin D. Günay. "The Structure and Transport Properties of β-Mg3Bi2 in Superionic Conduction and Molten Phase." In SIXTH INTERNATIONAL CONFERENCE OF THE BALKAN PHYSICAL UNION. AIP, 2007. http://dx.doi.org/10.1063/1.2733318.

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SHIMOJO, FUYUKI, MASARU ANIYA, and KOZO HOSHINO. "AB INITIO MOLECULAR-DYNAMICS SIMULATIONS OF SUPERIONIC PHASES OF Cu HALIDES AND Ag CHALCOGENIDES." In Proceedings of the 1st International Discussion Meeting. WORLD SCIENTIFIC, 2007. http://dx.doi.org/10.1142/9789812706904_0012.

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