Amorphous Materials, Structure Of

Elliott, S. R.

doi:10.1002/3527600434.eap019

Cited by 18 publications

(28 citation statements)

References 78 publications

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“…The application of pressure to certain crystalline materials, i.e. so-called pressure induced amorphization, can cause them to become amorphous under certain conditions [ 41 ]. An anatase-amorphous transition regime was also reported to occur for TiO 2 of very fine crystallite size upon static compression at room temperature using the diamond anvil cell technique [ 42 ].…”

Section: Discussionmentioning

confidence: 99%

Nonstoichiometric Titanium Oxides via Pulsed Laser Ablation in Water

Bow²,

et al. 2010

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Titanium oxide compounds TiO,Ti2O3, and TiO2 with a considerable extent of nonstoichiometry were fabricated by pulsed laser ablation in water and characterized by X-ray/electron diffraction, X-ray photoelectron spectroscopy and electron energy loss spectroscopy. The titanium oxides were found to occur as nanoparticle aggregates with a predominant 3+ charge and amorphous microtubes when fabricated under an average power density of ca. 1 × 108W/cm2 and 1011W/cm2, respectively followed by dwelling in water. The crystalline colloidal particles have a relatively high content of Ti2+ and hence a lower minimum band gap of 3.4 eV in comparison with 5.2 eV for the amorphous state. The protonation on both crystalline and amorphous phase caused defects, mainly titanium rather than oxygen vacancies and charge and/or volume-compensating defects. The hydrophilic nature and presumably varied extent of undercoordination at the free surface of the amorphous lamellae accounts for their rolling as tubes at water/air and water/glass interfaces. The nonstoichiometric titania thus fabricated have potential optoelectronic and catalytic applications in UV–visible range and shed light on the Ti charge and phase behavior of titania-water binary in natural shock occurrence.

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Section: Discussionmentioning

confidence: 99%

Nonstoichiometric Titanium Oxides via Pulsed Laser Ablation in Water

Bow²,

et al. 2010

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“…The common feature of semiconductors that the total conductivity is a sum of the two components: dc conductivity ( ), which is independent of frequency; and frequency dependent conductivity ( ) [20,21] :…”

Section: Frequency and Temperature Dependences Of σ Ac (ω)mentioning

confidence: 99%

AC Conductivity and Dielectrical Properties of Bulk TlInSe2

2013

Egyptian Journal of Solids

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AC conductivity and dielectric properties of bulk TlInSe 2 were studied in the frequency and temperature range of 42-1 MHz and 294-473 K, respectively. The XRD pattern showed that the powder of TlInSe 2 has a tetragonal structure. AC conductivity, σ ac (ω), as a function of frequency varies as power law: σ ac (ω) = B ω s. Temperature dependence of frequency exponent was analyzed to predict the conduction mechanism, which was found to be correlated barrier hoping model (CBH). Frequency and temperature dependences of dielectric constant and dielectric loss were also investigated. Electric modulus formalism was applied for evaluating the activation energy of the dielectric relaxation process.

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“…The term “amorphous” is generally used for non-crystalline solids that are obtained as thin films, flakes, nanoparticles by bottom-up approach (condensation of vapors on a cold substrate), or as powders by grinding the material in a ball mill. On the other hand, glasses are defined as those non-crystalline materials obtained by rapid solidification of their melt 6 , or, according to Phillips 7 and Elliott 8 , as non-crystalline solids which have a glass transition.…”

Section: Introductionmentioning

confidence: 99%

Structural and optical properties of amorphous Si–Ge–Te thin films prepared by combinatorial sputtering

Mihai

Sava

Şimăndan

et al. 2021

Sci Rep

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The lack of order in amorphous chalcogenides offers them novel properties but also adds increased challenges in the discovery and design of advanced functional materials. The amorphous compositions in the Si–Ge–Te system are of interest for many applications such as optical data storage, optical sensors and Ovonic threshold switches. But an extended exploration of this system is still missing. In this study, magnetron co-sputtering is used for the combinatorial synthesis of thin film libraries, outside the glass formation domain. Compositional, structural and optical properties are investigated and discussed in the framework of topological constraint theory. The materials in the library are classified as stressed-rigid amorphous networks. The bandgap is heavily influenced by the Te content while the near-IR refractive index dependence on Ge concentration shows a minimum, which could be exploited in applications. A transition from a disordered to a more ordered amorphous network at 60 at% Te, is observed. The thermal stability study shows that the formed crystalline phases are dictated by the concentration of Ge and Te. New amorphous compositions in the Si–Ge–Te system were found and their properties explored, thus enabling an informed and rapid material selection and design for applications.

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Amorphous Materials, Structure Of

Cited by 18 publications

References 78 publications

Nonstoichiometric Titanium Oxides via Pulsed Laser Ablation in Water

Nonstoichiometric Titanium Oxides via Pulsed Laser Ablation in Water

AC Conductivity and Dielectrical Properties of Bulk TlInSe2

Structural and optical properties of amorphous Si–Ge–Te thin films prepared by combinatorial sputtering

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