Academic literature on the topic 'Lanthanide; Crystal field energy'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Lanthanide; Crystal field energy.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Lanthanide; Crystal field energy"

1

Grochala, Wojciech, Tomasz Jaron, Wojciech Wegner, and Dawid Pancerz. "Novel lanthanide borohydrides: magnetism of all flavours." Acta Crystallographica Section A Foundations and Advances 70, a1 (August 5, 2014): C275. http://dx.doi.org/10.1107/s2053273314097241.

Full text
Abstract:
The rare-earth metals have high magnetic moments and a diverse range of magnetic structures. However, due to the inner-transition nature of lanthanide elements, the valence f orbitals of their trivalent cations usually do not mix substantially with the ligands' orbitals in the chemical compounds. The majority of lanthanide compounds is thus characterized by a rather ionic metal–ligand bonding and is hosting only weak crystal field effects. Several exceptions known encompass the valence fluctuation systems consisting of Sm, Ey, Tm or Yb combined with less electronegative nonmetal ligands (Si, S, Se, B etc.) or metals (Murani 2003 and references therein). This important class of lanthanide compounds for which crystal field effects are strong includes the classical systems: Yb3Si5 (Iandelli et al., 1979), YbB12 (Altshuler et al., 1998), and Yb3H8 (Drulis et al., 1999) . Even elemental Yb and Eu metals show valence transition at elevated pressure from di- to trivalent (Takemura & Syassen, 1985). These valence fluctuations are typically accompanied by electric resistivity changes: Ln(2+) → Ln(3+) + e–. Lanthanide borohydrides, Ln(BH4)3, constitute a rather poorly explored and novel group of compounds (Olsen et al., 2014). They are conveniently prepared via mechanochemical synthesis approach (high-energy milling). Quasi-ternary alkali metal-lanthanide borohydrides, MLn(BH4)4, are also available using this synthetic procedure (Wegner et al., 2013 [1] & Wegner et al., 2014 [2]). Here we explore for the first time the magnetic properties of Ln(BH4)3 and MLn(BH4)4 compounds, with particular emphasis on the thermally unstable systems (Ln= Sm, Yb and Eu) as contrasted with the reference case of much more thermally stable derivatives of ordinary lanthanides (Ln = Ho). We show that remarkably strong mixing of Ln(4f) and H(1s) states which causes thermal instability: Ln(3+) + BH4–→ Ln(2+) + BH4· leads in some cases to strong magnetic superexchange interactions between Ln(3+) centers [3].
APA, Harvard, Vancouver, ISO, and other styles
2

Aksenova, Elena, Liliya Dobrun, Alexander Kovshik, Evgeny Ryumtsev, and Ivan Tambovtcev. "Magnetic Field-Induced Macroscopic Alignment of Liquid-Crystalline Lanthanide Complexes." Crystals 9, no. 10 (September 25, 2019): 499. http://dx.doi.org/10.3390/cryst9100499.

Full text
Abstract:
We propose a theoretical approach and a numerical method for determining the Frank elastic constants based on the experimental dependence of the effective values of the permittivity components on the magnetic field. The theoretical task was to find the minimum of the free energy and then to solve the inverse problem on finding elastic constants by the least squares root minimizing with experimental data. The proposed approach combines strong and weak models with various pretilt conditions at the boundaries. This model also describes the inhomogeneity of the electric field inside the sample. The proposed method allows to achieve higher accuracy using a small amount of experimental data. This statement is confirmed by the error estimation study, which is also presented in this research. As an experimental sample, we used the gadolinium-based liquid crystal complex, since there are no data on the Frank elastic constants for this complex.
APA, Harvard, Vancouver, ISO, and other styles
3

Mandal, Biswas, and Yamashita. "Magnetic Behavior of Luminescent Dinuclear Dysprosium and Terbium Complexes Derived from Phenoxyacetic Acid and 2,2’-Bipyridine." Magnetochemistry 5, no. 4 (October 1, 2019): 56. http://dx.doi.org/10.3390/magnetochemistry5040056.

Full text
Abstract:
Two dinuclear lanthanide complexes [Dy2(L1)6(L2)2]·2EtOH (1) and [Tb2(L1)6(L2)2]·2EtOH (2) (HL1 = phenoxyacetic acid and L2 = 2,2’-bipyridine) were synthesized and the crystal structures were determined. In both complexes, the lanthanide centers are nine-coordinated and have a muffin geometry. Detailed magnetic study reveals the presence of field-induced single molecule magnet (SMM) behavior for complex 1, whereas complex 2 is non-SMM in nature. Further magnetic study with 1’, yttrium doped magnetically diluted sample of 1, disclosed the presence of Orbach and Raman relaxation processes with effective energy barrier, ∆E = 16.26 cm−1 and relaxation time, τo = 2.42 × 10−8 s. Luminescence spectra for complexes 1 and 2 in acetonitrile were studied which show characteristic emission peaks for DyIII and TbIII ions, respectively.
APA, Harvard, Vancouver, ISO, and other styles
4

Zhang, Dan, He Zhang, Cheng Xun Sun, and Bao Yu Zhu. "Non-Injection One-Pot Synthesized Lanthanide Ions Doped CdSe Nanocrystals with their Energy Transfer." Advanced Materials Research 662 (February 2013): 28–34. http://dx.doi.org/10.4028/www.scientific.net/amr.662.28.

Full text
Abstract:
The OA protected, Eu doped CdSe nanocrystals (NCs), which optical property could be control by temperature and reactant molar ratio, were prepared by non-injection one-pot synthesized method. And after modifying TTA, the Eu doped NCs showed energy transfer from NCs to Eu. The size, crystal structure, composition and the optical property of product were further studied in detail by TEM, PL, UV, XRD and EDS. The Eu doped NCs with excellent lanthanide characteristic fluorescence were possessed many potential applications in various fields, such as biological labeling, immunoassays, optical sensing, and so on.
APA, Harvard, Vancouver, ISO, and other styles
5

Yin, Lingzhen, Tianmei Zeng, Zhigao Yi, Chao Qian, and Hongrong Liu. "Synthesis, Tunable Multicolor Output, and High Pure Red Upconversion Emission of Lanthanide-Doped Lu2O3Nanosheets." Advances in Condensed Matter Physics 2013 (2013): 1–6. http://dx.doi.org/10.1155/2013/920369.

Full text
Abstract:
Yb3+and Ln3+(Ln = Er, Ho) codoped Lu2O3square nanocubic sheets were successfully synthesized via a facile hydrothermal method followed by a subsequent dehydration process. The crystal phase, morphology, and composition of hydroxide precursors and target oxides were characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), and energy-dispersive X-ray spectroscope (EDS). Results present the as-prepared Lu2O3crystallized in cubic phase, and the monodispersed square nanosheets were maintained both in hydroxide and oxides. Moreover, under 980 nm laser diode (LD) excitation, multicolor output from red to yellow was realized by codoped different lanthanide ions in Lu2O3. It is noteworthy that high pure strong red upconversion emission with red to green ratio of 443.3 of Er-containing nanocrystals was obtained, which is beneficial forin vivooptical bioimaging.
APA, Harvard, Vancouver, ISO, and other styles
6

Mylonas-Margaritis, Ioannis, Diamantoula Maniaki, Julia Mayans, Laura Ciammaruchi, Vlasoula Bekiari, Catherine P. Raptopoulou, Vassilis Psycharis, Sotirios Christodoulou, Albert Escuer, and Spyros P. Perlepes. "Mononuclear Lanthanide(III)-Salicylideneaniline Complexes: Synthetic, Structural, Spectroscopic, and Magnetic Studies." Magnetochemistry 4, no. 4 (October 7, 2018): 45. http://dx.doi.org/10.3390/magnetochemistry4040045.

Full text
Abstract:
The reactions of hydrated lanthanide(III) [Ln(III)] nitrates and salicylideneaniline (salanH) have provided access to two families of mononuclear complexes depending on the reaction solvent used. In MeCN, the products are [Ln(NO3)3(salanH)2(H2O)]·MeCN, and, in MeOH, the products are [Ln(NO3)3(salanH)2(MeOH)]·(salanH). The complexes within each family are proven to be isomorphous. The structures of complexes [Ln(NO3)3(salanH)2(H2O)]·MeCN (Ln = Eu, 4·MeCN_Eu, Ln = Dy, 7·MeCN_Dy; Ln = Yb, 10·MeCN_Yb) and [Ln(NO3)3(salanH)2(MeOH)]·(salanH) (Ln = Tb, 17_Tb; Ln = Dy, 18_Dy) have been solved by single-crystal X-ray crystallography. In the five complexes, the LnIII center is bound to six oxygen atoms from the three bidentate chelating nitrato groups, two oxygen atoms from the two monodentate zwitterionic salanH ligands, and one oxygen atom from the coordinated H2O or MeOH group. The salanH ligands are mutually “cis” in 4·MeCN_Eu, 7·MeCN_Dy and 10·MeCN_Yb while they are “trans” in 17_Tb and 18_Dy. The lattice salanH molecule in 17_Tb and 18_Dy is also in its zwitterionic form with the acidic H atom being clearly located on the imine nitrogen atom. The coordination polyhedra defined by the nine oxygen donor atoms can be described as spherical tricapped trigonal prisms in 4·MeCN_Eu, 7·MeCN_Dy, and 10·MeCN_Yb and as spherical capped square antiprisms in 17_Tb and 18_Dy. Various intermolecular interactions build the crystal structures, which are completely different in the members of the two families. Solid-state IR data of the complexes are discussed in terms of their structural features. 1H NMR data for the diamagnetic Y(III) complexes provide strong evidence that the compounds decompose in DMSO by releasing the coordinated salanH ligands. The solid complexes emit green light upon excitation at 360 nm (room temperature) or 405 nm (room temperature). The emission is ligand-based. The solid Pr(III), Nd(III), Sm(III), Er(III), and Yb(III) complexes of both families exhibit LnIII-centered emission in the near-IR region of the electromagnetic spectrum, but there is probably no efficient salanH→LnIII energy transfer responsible for this emission. Detailed magnetic studies reveal that complexes 7·MeCN_Dy, 17_Tb and 18_Dy show field-induced slow magnetic relaxation while complex [Tb(NO3)3(salanH)2(H2O)]·MeCN (6·MeCN_Tb) does not display such properties. The values of the effective energy barrier for magnetization reversal are 13.1 cm−1 for 7·MeCN_Dy, 14.8 cm−1 for 17_Tb, and 31.0 cm−1 for 18_Dy. The enhanced/improved properties of 17_Tb and 18_Dy, compared to those of 6_Tb and 7_Dy, have been correlated with the different supramolecular structural features of the two families. The molecules [Ln(NO3)3(salanH)2(MeOH)] of complexes 17_Tb and 18_Dy are by far better isolated (allowing for better slow magnetic relaxation properties) than the molecules [Ln(NO3)3(salanH)2(H2O)] in 6·MeCN_Tb and 7·MeCN_Dy. The perspectives of the present initial studies in the Ln(III)/salanH chemistry are discussed.
APA, Harvard, Vancouver, ISO, and other styles
7

Suta, Markus, Željka Antić, Vesna Ðorđević, Sanja Kuzman, Miroslav D. Dramićanin, and Andries Meijerink. "Making Nd3+ a Sensitive Luminescent Thermometer for Physiological Temperatures—An Account of Pitfalls in Boltzmann Thermometry." Nanomaterials 10, no. 3 (March 18, 2020): 543. http://dx.doi.org/10.3390/nano10030543.

Full text
Abstract:
Ratiometric luminescence thermometry employing luminescence within the biological transparency windows provides high potential for biothermal imaging. Nd3+ is a promising candidate for that purpose due to its intense radiative transitions within biological windows (BWs) I and II and the simultaneous efficient excitability within BW I. This makes Nd3+ almost unique among all lanthanides. Typically, emission from the two 4F3/2 crystal field levels is used for thermometry but the small ~100 cm−1 energy separation limits the sensitivity. A higher sensitivity for physiological temperatures is possible using the luminescence intensity ratio (LIR) of the emissive transitions from the 4F5/2 and 4F3/2 excited spin-orbit levels. Herein, we demonstrate and discuss various pitfalls that can occur in Boltzmann thermometry if this particular LIR is used for physiological temperature sensing. Both microcrystalline, dilute (0.1%) Nd3+-doped LaPO4 and LaPO4: x% Nd3+ (x = 2, 5, 10, 25, 100) nanocrystals serve as an illustrative example. Besides structural and optical characterization of those luminescent thermometers, the impact and consequences of the Nd3+ concentration on their luminescence and performance as Boltzmann-based thermometers are analyzed. For low Nd3+ concentrations, Boltzmann equilibrium starts just around 300 K. At higher Nd3+ concentrations, cross-relaxation processes enhance the decay rates of the 4F3/2 and 4F5/2 levels making the decay faster than the equilibration rates between the levels. It is shown that the onset of the useful temperature sensing range shifts to higher temperatures, even above ~ 450 K for Nd concentrations over 5%. A microscopic explanation for pitfalls in Boltzmann thermometry with Nd3+ is finally given and guidelines for the usability of this lanthanide ion in the field of physiological temperature sensing are elaborated. Insight in competition between thermal coupling through non-radiative transitions and population decay through cross-relaxation of the 4F5/2 and 4F3/2 spin-orbit levels of Nd3+ makes it possible to tailor the thermometric performance of Nd3+ to enable physiological temperature sensing.
APA, Harvard, Vancouver, ISO, and other styles
8

Baldoví, José J., Salvador Cardona-Serra, Juan M. Clemente-Juan, Eugenio Coronado, Alejandro Gaita-Ariño, and Andrew Palii. "SIMPRE: A software package to calculate crystal field parameters, energy levels, and magnetic properties on mononuclear lanthanoid complexes based on charge distributions." Journal of Computational Chemistry 34, no. 22 (June 5, 2013): 1961–67. http://dx.doi.org/10.1002/jcc.23341.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Alexandropoulos, Dimitris, Alysha Alaimo, Di Sun, and Theocharis Stamatatos. "A New {Dy5} Single-Molecule Magnet Bearing the Schiff Base Ligand N-Naphthalidene-2-amino-5-chlorophenol." Magnetochemistry 4, no. 4 (November 1, 2018): 48. http://dx.doi.org/10.3390/magnetochemistry4040048.

Full text
Abstract:
A new {Dy5} cluster compound has been synthesized and structurally characterized from the initial use of the Schiff base ligand N-naphthalidene-2-amino-5-chlorophenol (nacpH2) in coordination chemistry. The 1:1 reaction between Dy(hpd)3∙2H2O and nacpH2, in a solvent mixture comprising CH2Cl2 and MeOH, afforded orange crystals of [Dy5(OH)2(hpd)3(nacp)5(MeOH)5] (1) in 70% yield, where hpd− is the anion of 3,5-heptadione. The {Dy5} complex can be described as two vertical {Dy3(μ3-OH)}8+ triangles sharing a common vertex; such a metal topology is unprecedented in 4f-metal cluster chemistry. Direct current (dc) magnetic susceptibility studies revealed the presence of some weak ferromagnetic exchange interactions between the five DyIII ions at low temperatures. Alternating current (ac) magnetic susceptibility measurements at zero applied dc field showed that complex 1∙3MeOH∙CH2Cl2 exhibits temperature- and frequency-dependent out-of-phase signals below ~20 K, characteristics of a single-molecule magnet (SMM). The resulting relaxation times were used to construct an Arrhenius-type plot and determine an effective energy barrier, Ueff, of 100 K for the magnetization reversal. The application of a small dc field of 200 Oe resulted in the surpassing of the quantum tunneling process and subsequently the increase of the Ueff to a value of 170 K. The reported results are part of a long-term program aiming at the preparation of structurally and magnetically interesting lanthanide complexes bearing various Schiff base chelating/bridging ligands.
APA, Harvard, Vancouver, ISO, and other styles
10

Colarieti-Tosti, M., O. Eriksson, L. Nordström, M. S. S. Brooks, and J. Wills. "Crystal field levels in lanthanide systems." Journal of Magnetism and Magnetic Materials 226-230 (May 2001): 1027–28. http://dx.doi.org/10.1016/s0304-8853(00)00901-x.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Dissertations / Theses on the topic "Lanthanide; Crystal field energy"

1

Berry, Andrew John. "Optical spectroscopy of terbium elpasolites." Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320164.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

蔡慶銘 and Hing-ming Michael Chua. "Transition intensities and energy transfer of lanthanide ions in crystals." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1994. http://hub.hku.hk/bib/B31211409.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Chua, Hing-ming Michael. "Transition intensities and energy transfer of lanthanide ions in crystals /." [Hong Kong : University of Hong Kong], 1994. http://sunzi.lib.hku.hk/hkuto/record.jsp?B13692689.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Karla, Ingo. "Various energy scales in rare earth compounds : multiplets, band energy gaps and crystal fields in RE nickel antimonides." Université Joseph Fourier (Grenoble), 1999. http://www.theses.fr/1999GRE10191.

Full text
Abstract:
Les proprietes des composes rnisb sont etudiees sous plusieurs aspects : magnetisme, transport, structure electronique. Les composes hexagonaux avec une terre rare legere sont metalliques, les phases cubiques du type semi-heusler avec les terres rares lourdes sont des semiconducteurs a faible gap. Des phenomenes de magnetoresistance geante sont observes a basse temperature, d'autant plus importants que la densite de porteurs est plus faible. Ils sont expliques par la polarisation par le moment de la couche 4f des niveaux d'impuretes situes dans le gap du semiconducteur. Le champ cristallin, ainsi que l'ordre magnetique a basse temperature, ont ete etudies par diffusion (diffraction) de neutrons. Certaines proprietes magnetiques (absence d'ordre magnetique avec le pr, structures af dans le second groupe, orientation des moments) ont pu etre expliquees au moins qualitativement. Cenisb est un compose de type kondo avec une temperature de kondo de l'ordre de 8k. Des mesures de photoemission ont permis de preciser la structure des bandes de valence de ces composes, en accord avec des calculs de structure electronique. Par photoemission resonante dans tbnisb et gdcu, differents canaux de resonance ont ete resolus en fonction de l'energie, qui dependent de la structure des multiples et de la configuration des niveaux excites.
APA, Harvard, Vancouver, ISO, and other styles
5

Yeung, Yau-yuen. "Alternative parametrization schemes in lanthanide crystal field theory /." [Hong Kong : University of Hong Kong], 1986. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12324863.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

楊友源 and Yau-yuen Yeung. "Alternative parametrization schemes in lanthanide crystal fieldtheory." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1986. http://hub.hku.hk/bib/B31231044.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Luo, Yuxia. "The study of energy transfer and local field effect in lanthanide complexes with high and low symmetry." HKBU Institutional Repository, 2019. https://repository.hkbu.edu.hk/etd_oa/696.

Full text
Abstract:
There are lots of important applications for lanthanides (Ln) because of their unique properties. The properties are closely linked to the environment of the crystal field. Thus, two kind of crystals Cs2NaLn(NO2)6 with high Th point-group symmetry and LnPO4 with monoclinic symmetry were chosen to study quantum cutting and Stokes shift. Quantum cutting is a kind of down-conversion energy transfer in which one excitation ultraviolet photon is transformed into multiple near infrared photons. This phenomenon has been studied in Cs2NaY0.96Yb0.04(NO2)6. The emission from Yb3+ can be excited via the NO2- antenna. The electronic transition of NO2- is situated at more than twice the energy of the Yb3+. At room temperature, one photon absorbed at 470 nm in the triplet state produced no more than one photon emitted. Some degree of quantum cutting was observed at 298 K under 420 nm excitation into the singlet state and at 25 K using excitation into singlet and triplet state. The quantum efficiency was about 10% at 25 K. In Chapter 3, Stokes shift which is the energy shift between the peak maxima in absorption and emission was studied. Stokes shift is related to the flexibility of the lattice and the coordination environment. Cs2NaCe(NO2)6 with 12-coordinated Ce3+ situated at a site of Th symmetry demonstrated the largest Ce-O Stokes shift of 8715 cm−1. The 4f1 ground state and 5d1 potential surfaces have displaced so much along the configuration coordinate that overlap takes place above the 5d1 minimum, leading to thermal quenching of emission at 53 K. A comparison of Stokes shifts with other Ce-O systems with different coordination number demonstrated larger Stokes shifts for Ce3+ ions with higher coordination number. Systematic research about the energy transfer (ET) and energy migration phenomenon is still scarce, although they exist extensively among lanthanide ions. The energy migration in highly doped materials has been stated as very fast or slow, but no experimental proof was reported. In Chapter 4, the ET between Tb3+ and Eu3+ was investigated experimentally and compared with available theoretical models in the regime of high Tb3+ concentrations in 30 nm LaPO4 nanoparticles at room temperature. The ET efficiency approached 100% even for lightly Eu3+-doped materials. The use of pulsed laser excitation and switched-off continuous wave laser diode excitation demonstrated that the energy migration between Tb3+ ions, situated on La3+ sites with a 4 Å separation was not fast. The quenching of Tb3+ emission in singly doped LaPO4 only reduced the luminescence lifetime by about 50% in heavily doped samples. Various theoretical models have been applied to simulate the luminescence decays of Tb3+ and Eu3+-doped LaPO4 samples of various concentrations. The transfer mechanism has been identified as forced electric dipole at each ion. The control of energy transfer rate and efficiency is also an important issue. There are many chemical and geometrical factors that affect energy transfer, including the spectra overlap, the dipole orientation and the distance between the donor and acceptor. The local field of the emission center is another factor that affect the energy transfer by changing the photonic environment. In Chapter 5, the local field effect on the energy transfer between Tb3+ and Eu3+ doped in LaPO4 dispersed in different solvents and solids with a wide range of refractive indexes was studied. The effects of local field (reflected by refractive index) on the ET efficiency and ET rates were clarified that the ET efficiency would decrease with increasing refractive index, while ET rates were independent of the refractive index
APA, Harvard, Vancouver, ISO, and other styles
8

Kabro, Pierre. "Optical spectroscopy, crystal field analysis, upconversion and energy transfer studies of Er³§+ doped yttrium vanadate single crystals." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq25909.pdf.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Cao, Kanyu. "Crystal-field splitting of Er 3+in ZnO and experimental observations." Ohio : Ohio University, 1997. http://www.ohiolink.edu/etd/view.cgi?ohiou1177608455.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Bright, Trevor James. "Infrared properties of dielectric thin films and near-field radiation for energy conversion." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/50364.

Full text
Abstract:
Studies of the radiative properties of thin films and near-field radiation transfer in layered structures are important for applications in energy, near-field imaging, coherent thermal emission, and aerospace thermal management. A comprehensive study is performed on the optical constants of dielectric tantalum pentoxide (Ta₂O₅) and hafnium oxide (HfO₂) thin films from visible to the far infrared using spectroscopic methods. These materials have broad applications in metallo-dielectric multilayers, anti-reflection coatings, and coherent emitters based on photonic crystal structures, especially at high temperatures since both materials have melting points above 2000 K. The dielectric functions of HfO₂ and Ta₂O₅ obtained from this work may facilitate future design of devices with these materials. A parametric study of near-field TPV performance using a backside reflecting mirror is also performed. Currently proposed near-field TPV devices have been shown to have increased power throughput compared to their far-field counterparts, but whose conversion efficiencies are lower than desired. This is due to their low quantum efficiency caused by recombination of minority carriers and the waste of sub-bandgap radiation. The efficiency may be improved by adding a gold mirror as well as by reducing the surface recombination velocity, as demonstrated in this thesis. The analysis of the near-field TPV and proposed methods may facilitate the development or high-efficiency energy harvesting devices. Many near-field devices may eventually utilize metallo-dielectric structures which exhibit unique properties such as negative refraction due to their hyperbolic isofrequency contour. These metamaterials are also called indefinite materials because of their ability to support propagating waves with large lateral wavevectors, which can result in enhanced near-field radiative heat transfer. The energy streamlines in such structures are studied for the first time. Energy streamlines illustrate the flow of energy through a structure when the fields are evanescent and energy propagation is not ray like. The energy streamlines through two semi-infinite uniaxially anisotropic effective medium structures, separated by a small vacuum gap, are modeled using the Green’s function. The lateral shift and penetration depth are calculated from the streamlines and shown to be relatively large compared to the vacuum gap dimension. The study of energy streamlines in hyperbolic metamaterials helps understand the near-field energy propagation on a fundamental level.
APA, Harvard, Vancouver, ISO, and other styles

Books on the topic "Lanthanide; Crystal field energy"

1

Rainey, Amber. Crystal Healing: How Crystal Healing Works, Crystal Therapy, the Human Energy Field, Gemstones, and How to Use Crystals for Healing and Increased Energy! Ingram Publishing, 2020.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

Crystal Healing: How crystal healing works, crystal therapy, the human energy field, gemstones, and how to use crystals for healing and increased energy! CreateSpace Independent Publishing Platform, 2015.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

Crystal Healing: Types Of Crystals And Their Impact On Human Energy Field. Amazon Digital Services, Inc., 2015.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

J, Eggleston J., Voorhees P. W. 1955-, and National Institute of Standards and Technology (U.S.), eds. A phase-field model for high anisotropic interfacial energy. [Gaithersburg, MD]: U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 2001.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

J, Eggleston J., Voorhees P. W. 1955-, and National Institute of Standards and Technology (U.S.), eds. A phase-field model for high anisotropic interfacial energy. [Gaithersburg, MD]: U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 2001.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
6

J, Eggleston J., Voorhees P. W, and National Institute of Standards and Technology (U.S.), eds. A phase-field model for high anisotropic interfacial energy. [Gaithersburg, MD]: U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 2001.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
7

A phase-field model for high anisotropic interfacial energy. [Gaithersburg, MD]: U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 2001.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
8

A phase-field model for high anisotropic interfacial energy. [Gaithersburg, MD]: U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 2001.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
9

J, Eggleston J., Voorhees P. W, and National Institute of Standards and Technology (U.S.), eds. A phase-field model for high anisotropic interfacial energy. [Gaithersburg, MD]: U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 2001.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
10

Komak, Kristin. Crystal Healing: A Guide to Crystal Healing, the Human Energy Field, and How to Improve Your Health with Crystals! Ingram Publishing, 2020.

Find full text
APA, Harvard, Vancouver, ISO, and other styles

Book chapters on the topic "Lanthanide; Crystal field energy"

1

Meyer, B. K. "ZnO: crystal-field splitting energy." In New Data and Updates for IV-IV, III-V, II-VI and I-VII Compounds, their Mixed Crystals and Diluted Magnetic Semiconductors, 583. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-14148-5_324.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Chizhik, Vladimir I., Yuri S. Chernyshev, Alexey V. Donets, Vyacheslav V. Frolov, Andrei V. Komolkin, and Marina G. Shelyapina. "Energy Levels of Paramagnetic Center in Crystal Field." In Magnetic Resonance and Its Applications, 555–77. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-05299-1_11.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Clemente-Juan, Juan M., Eugenio Coronado, and Alejandro Gaita-Ariño. "Mononuclear Lanthanide Complexes: Use of the Crystal Field Theory to Design Single-Ion Magnets and Spin Qubits." In Lanthanides and Actinides in Molecular Magnetism, 27–60. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2015. http://dx.doi.org/10.1002/9783527673476.ch2.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Liu, G. K. "Lanthanide and actinide optical spectra." In Crystal Field Handbook, 65–82. Cambridge University Press, 2000. http://dx.doi.org/10.1017/cbo9780511524295.006.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

"Energy level diagrams and crystal field spectra of transition metal ions." In Mineralogical Applications of Crystal Field Theory, 44–86. Cambridge University Press, 1993. http://dx.doi.org/10.1017/cbo9780511524899.005.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

"Energy levels of ions in crystals." In Crystal-Field Engineering of Solid-State Laser Materials, 93–133. Cambridge University Press, 2000. http://dx.doi.org/10.1017/cbo9780511524165.005.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

"Energy transfer and excited state absorption." In Crystal-Field Engineering of Solid-State Laser Materials, 194–221. Cambridge University Press, 2000. http://dx.doi.org/10.1017/cbo9780511524165.008.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Sutton, Adrian P. "Dislocations." In Physics of Elasticity and Crystal Defects, 105–40. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198860785.003.0006.

Full text
Abstract:
Plastic deformation involves planes of atoms sliding over each other. The sliding happens through the movement of linear defects called dislocations. The phenomenology of dislocations and their characterisation by the Burgers circuit and line direction are described. The Green’s function plays a central role in Volterra’s formula for the displacement field of a dislocation and Mura’s formula for the strain and stress fields. The isotropic elastic fields of edge and screw dislocations are derived. The field of an infinitesimal dislocation loop and its dipole tensor are also derived. The elastic energy of interaction between a dislocation and another source of stress is derived, and leads to force on a dislocation. The elastic energy of a dislocation and the Frank-Read source of dislocations are also discussed. Problem set 6 extends the content of the chapter in several directions including grain boundaries and faults.
APA, Harvard, Vancouver, ISO, and other styles
9

Mazurak, Z., J. B. Gruber, C. A. Morrison, and S. Maia-Melo. "OPTICAL SPECTRA, ENERGY LEVELS AND CRYSTAL-FIELD ANALYSIS OF Pr3+, Nd3+, Er3+ IN Li, K LnP4O12 CRYSTALS." In New Frontiers in Rare Earth Science and Applications, 346. Elsevier, 1985. http://dx.doi.org/10.1016/b978-0-12-767661-6.50086-2.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Sutton, Adrian P. "The force on a defect." In Physics of Elasticity and Crystal Defects, 163–78. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198860785.003.0008.

Full text
Abstract:
This chapter is based on Eshelby’s static energy-momentum tensor which results in an integral expression for the configurational force on a defect. After elucidating the concepts of a configurational force and an elastic singularity the mechanical pressure on an interface, such as a twin boundary or a martensitic interface, is derived. Eshelby’s force on a defect is derived using both physical arguments and more formally using classical field theory. It is equivalent to the J-integral in fracture mechanics. The Peach–Koehler force on a dislocation is rederived using the static energy-momentum tensor. An expression for an image force is derived, where a defect interacts with a free surface.
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Lanthanide; Crystal field energy"

1

Ye, Wenjiang, Zhidong Zhang, Hongyu Xing, Guochen Yang, and Guoying Chen. "Electric-field-induced effective anchoring energy in nematic liquid crystal." In 2010 International Conference on Display and Photonics, edited by Yanwen Wu. SPIE, 2010. http://dx.doi.org/10.1117/12.869375.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Sun, Qiang, Hu Sheng, Guitao Chen, and Junpeng Ji. "Research on the Cusp Electromagnetic Field in Single Crystal Furnace." In 2011 Asia-Pacific Power and Energy Engineering Conference (APPEEC). IEEE, 2011. http://dx.doi.org/10.1109/appeec.2011.5748925.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Petkova, P., E. L. Andreici, and N. M. Avram. "Crystal field parameters and energy levels scheme of trivalent chromium doped BSO." In TIM 2013 PHYSICS CONFERENCE. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4903025.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Shunkeyev, Kuanyshbek, Lyudmila Myasnikova, Aida Maratova, and Karlygash Bizhanova. "Mechanisms of Radiation Defect Formation in the KI Crystal in the Deformation Field." In 2020 7th International Congress on Energy Fluxes and Radiation Effects (EFRE). IEEE, 2020. http://dx.doi.org/10.1109/efre47760.2020.9242132.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Dovhyj, Ya, and I. Man'kovska. "Influence of the low-symmetry crystal field on the energy states of CuO crystals." In 2012 IEEE International Conference on Oxide Materials for Electronic Engineering (OMEE). IEEE, 2012. http://dx.doi.org/10.1109/omee.2012.6464814.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Ni, Xiao-Jing, and Min Huang. "Faraday Effect Optical Current/Magnetic Field Sensors Based on Cerium-Substituted Yttrium Iron Garnet Single Crystal." In 2010 Asia-Pacific Power and Energy Engineering Conference. IEEE, 2010. http://dx.doi.org/10.1109/appeec.2010.5448944.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Huang, Min, and Li Ling. "Faraday Rotation and Sensitivity of Bi-Substituted Iron Garnet Single Crystal for Optical Current/Magnetic Field Sensors." In 2009 Asia-Pacific Power and Energy Engineering Conference. IEEE, 2009. http://dx.doi.org/10.1109/appeec.2009.4918369.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Monteil, A., C. Garapon, and G. Boulon. "Cr3+ to Nd3+ energy transfer in substituted GGG in relation to the crystal field distribution." In ADVANCES IN LASER SCIENCE−IV. AIP, 1989. http://dx.doi.org/10.1063/1.38568.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

"Low Energy Methods of Mass Transfer Control during Crystal Growth in Microgravity: Rotating Magnetic Field and Vibrations." In 55th International Astronautical Congress of the International Astronautical Federation, the International Academy of Astronautics, and the International Institute of Space Law. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2004. http://dx.doi.org/10.2514/6.iac-04-j.4.02.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Vaida, M., M. G. Brik, N. M. Avram, Madalin Bunoiu, and Iosif Malaescu. "Crystal Field Parameters and Energy Levels Calculations for Fe[sup 3+]:ZnGa[sub 2]O[sub 4]." In Proceedings of the Physics Conference. AIP, 2010. http://dx.doi.org/10.1063/1.3482215.

Full text
APA, Harvard, Vancouver, ISO, and other styles
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography