ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Chemical and compositional changes induced by N+ implantation in amorphous SiC films (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 2013-2020 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effects of 30 keV N+ implantation in amorphous silicon carbide films deposited on silicon substrates by rf sputtering over a fluence range of 1×1016–2×1017 ions cm−2, are studied by means of x-ray photoelectron spectroscopy (XPS), Auger electron spectroscopy (AES), and infrared (IR) absorption techniques. The ion-induced modifications of these films have been investigated on the basis of the chemical state evolution of Si, C, and N (using XPS and AES) and on the basis of the vibrational features of the films components (using IR absorption). The results show that implanted N bonds Si selectively, substituting the C atoms in the silicon carbide, and the C substitution by N results in a composite layer of carbonitrides and free C. An ion-induced C transport has also been observed and correlations are established between the formation of silicon carbonitrides and the dynamical behavior of the C in the implanted layer. The latter appears as a superposition of (a) a chemically induced atomic redistribution, required by local stoichiometry and space-filling possibilities in an amorphous network, and (b) a radiation-induced redistribution, a mechanism that is prevailing at low-fluence implantation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354764
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Combined surface Brillouin scattering and x-ray reflectivity characterization of thin metallic films (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 672-678 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The structural and elastic properties of a thin gold film alloyed with Cu and Ni have been studied by surface Brillouin scattering, x-ray reflectivity and low angle x-ray diffraction. The role of guided (Sezawa) acoustic modes to determine precise values of the elastic constants has been ascertained. Although weak, the hardening effect of alloying elements has been clearly detected. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364207
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Elastic constants of cubic boron nitride films (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 2168-2170 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The elastic constants of a cubic boron nitride film, with a fraction of tetrahedral bonding of 96% were measured by surface Brillouin spectroscopy. Precise values for both shear and Young modulus were obtained. A comparison with nanoindentation results was made and a critical discussion of the discrepancies is offered. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1312201
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Modeling radiation induced structural evolution in nonmetallic compounds (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 1387-1394 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: To interpret and moreover to predict whether the structure of the near surface region of an ion bombarded crystalline system will be able to withstand irradiation, or it will undergo radiation induced amorphization is a difficult problem. The atomistic segregation charge transfer model is adopted here to interpret the stage of nucleation of a crystalline, or an amorphous structure in binary films of covalently bonded materials, ion bombarded under conditions favoring the formation of dense collision cascades. A nonequilibrium compositional profile is supposed to develop at the cascade–matrix interface, following bombardment induced interface segregation of one of the film constituents. Such a local stoichiometry change is associated with the development of a nonequilibrium electronic density profile. Interatomic interactions leading to the formation of amorphous, or crystalline nuclei are treated by local charge transfer reactions. Qualitative differences are found both concerning the energetics of charge transfer reactions and the bonding features of the nuclei, with a set of 14 compounds undergoing amorphization and 12 compounds remaining crystalline upon ion bombardment. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369270
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Structure and optical properties of TiN films prepared by dc sputtering and by ion beam assisted deposition
    Amsterdam : Elsevier
    Vacuum 43 (1992), S. 459-462 
    Details
    ISSN: 0042-207X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0042-207X(92)90056-3
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Strain driven thermoelastic instability toward brittle fracture (1980)
    Springer
    The European physical journal 39 (1980), S. 135-141 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The mechanism of the thermomechanical instability of an elastically slowly strained solid is explored, by a normal mode analysis of temperature and strain fluctuations. The strain dependence of the Grüneisen parameter is found to play a major role, since it controls the rates of damping of the lowest wavevector acoustic excitations pumped by the imposed strain. For α-titanium the instability is found to occur at a critical strain comparable with that of the elastic limit. The instability can be envisaged in terms of a fast growing deformation, presumably associated with an acoustic emission.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01301519
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Strain driven thermoelastic instability toward brittle fracture (1980)
    Springer
    The European physical journal 39 (1980), S. 280-280 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01292673
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Charge transfer and martensitic nucleation (1987)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 9 (1987), S. 1061-1071 
    Details
    ISSN: 0392-6737
    Keywords: Nucleation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto L’interpretazione microscopica della stabilità di fase in leghe che presentano transizione di fase martensitica con carattere termoelastico comprende un problema di nucleazione. La forte dipendenza dalla stechiometria della temperatura critica di trasformazione martensitica richiede di considerare nuclei difettivi dinamici, di natura non classica, per ottenere stime quantitativamente ragionevoli della barriera energetica alla nucleazione. I dati sperimentali su leghe basate su β AuZn sono organizzati in termini del modello atomistico del grado di localizzazione degli elettroni di valenza. Lo schema di trasferimento di carica che ne risulta è strettamente connesso con eventi elementari di segregazione superficiale, a loro volta pilotati dalle differenze di energia di superficie fra gli elementi in lega. Si discute poi la correlazione che risulta fra la nucleazione di martensite ed il modello di trasferimento di carica-segregazione, con particolare riguardo per il significato fisico dei vari termini energetici presenti.
    Abstract: Резюме Микроскопическая интерпретаџия Фазовой устойчивости в сплавах, претерпевающих термоупругое мартенситное превращение встречает трудную проблему зародышеобразования. Сильная зависимость критической температуры начала мартенситного превращения от состава требует введения неклассических дефектных ядер, динамической природы, для получения разумных оџенок энергетического барьера зародышеобразования. Получены экспериментальные данные для сплавов β-Au−Zn в рамках атомистической модели ≪стелени локализации валентных электронов≫. Результирующая схема переноса зарода строго коррелирует с элементарными поверхностными событиями сегрегации. Обсуждается связь между мартенситным зародышеобразованием и процессом ≪перенос заряда-сегрегация≫. Особое внимание обращается на физический смысл различных энергетических членов, входящих в рассматриваемую модель.
    Notes: Summary The microscopic interpretation of phase stability in alloys undergoing thermoelastic martensitic transformation involves a difficult nucleation problem. The strong dependence of the critical temperature for the onset of martensite on composition requires the introduction of nonclassical defective nuclei, of dynamic nature, to obtain reasonable estimates of the energy barrier to nucleation. Experimental data on β-Au−Zn-based alloys are organized in the framework of the atomistic model of the valence electron localization degree. The resulting charge transfer scheme is strictly correlated to elementary surface segregation events driven by elemental surface energy differences within the studied alloys. The connection between martensitic nucleation and charge transfer segregation is discussed, focusing on the physical meaning of the various energy terms entering the model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02451092
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Crystal-glass transition in ion-bombarded alloys (1988)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 10 (1988), S. 395-406 
    Details
    ISSN: 0392-6737
    Keywords: Impact phenomena, including electron spectra and sputtering
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si presenta un modello interpretativo della transizione cristallo-amorfo, o del mantenimento di struttura cristallina in leghe binarie sottoposte a bombardamento da fasci ionici energetici. Il modello tiene conto delle principali caratteristiche fisiche date dalle condizioni sperimentali, cioè formazione di spikes energetici ed evoluzione delle variazioni superficiali di composizione indotte dal bombardamento ionico. All'interfaccia spikereticolo si assume che avvengano interazioni interatomiche con scambio di carica, che danno luogo a formazione di nuclei di amorfizzazione, o, rispettivamente, cristallizzazione. Vengono identificate differenze qualitative fra sistemi che presentano transizione vetrosa e sistemi cristallini.
    Abstract: Резюме Предлагаеся модель образования стекла и сохранения кристаллической структуры в бинарных сплавах при облучении энергетическими ионными пучками. Учитывются основные физические процессы, обусловленные условиямнэксперимента, образование термических перегревов и модификация поверхости при облучении. Рассматриваются межатомные взаимодеиствия с перезарядкой, которые индуцируют образовние ядер аморфизации или ядер кристаллизации. Обнаружены каченные различня между образующимися стеклянными и кристаллическимисистемами.
    Notes: Summary A model for glass formation and crystal structure retainment in binary alloys undergoing irradiation by energetic ion beams is presented. The major physical features provided by experimental conditions, namely spike formation and evolution of bombardment-induced surface compositional variations, are taken into account. At spike-lattice interface interatomic interactions with charge transfer occur, which induce formation of amorphization, or crystallization nuclei. Qualitative differences are found between glass forming and crystalline systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02450129
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Nucleation of quasi-crystalline and amorphous structures (1989)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 11 (1989), S. 1123-1133 
    Details
    ISSN: 0392-6737
    Keywords: Metastable phases
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Le caratteristiche strutturali delle fasi quasi-cristalline ottenute per irraggiamento ionico vengono confrontate con quelle delle corrispondenti fasi amorfe. Si osserva che interazioni di natura chimica a breve raggio sono responsabili della formazione di clusters atomici e della loro organizzazione spaziale, a sua volta influenzata da specifici vincoli geometrici. Le stesse unità strutturali sono presenti in fase quasicristallina ed in fase amorfa; esse presentano identico tipo e grado di ordine locale, mentre differiscono essenzialmente nel grado di organizzazione dei difetti presenti all'interfaccia fra gruppi atomici ordinati.
    Abstract: Резюме Характеристики структуры квазикристаллических фаз, образованных при ионном облучении, сравниваются с характеристиками, соответствующими аморфным структурам. Химические силы определяют образование атомных кластеров и их пространственную организацию при определенных геометрических ограничениях. Аналогичные элементарные структурные блоки существуют в квазикристаллических и стеклянных фазах, которые обнаруживают идентичный локальный порядок, причем основное различие между ними определяется степенью организации дефектов на границах между упорядоченными атомными группами.
    Notes: Summary The structural characteristics of quasi-crystalline phases obtained by ion irradiation are compared with those of the corresponding amorphous structures. Chemical forces drive the formation of atomic clusters and their spatial organization under specific geometric constraints. The same elementary structural units exist in quasi-crystalline and glassy phases which display identical local order, their main difference being the degree of defect organization at the interface between locally ordered atomic groups.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02459020
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...