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3 edition of Radiative performance of rare earth garnet thin film selective emitters found in the catalog.

Radiative performance of rare earth garnet thin film selective emitters

Radiative performance of rare earth garnet thin film selective emitters

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  • 17 Currently reading

Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, DC], [Springfield, Va .
Written in

    Subjects:
  • Doped crystals.,
  • Emitters.,
  • Energy absorption films.,
  • Energy conversion efficiency.,
  • Photovoltaic cells.,
  • Photovoltaic conversion.,
  • Semiconductor devices.,
  • Semiconductors (Materials),
  • Spectral emission.,
  • Thin films.,
  • Yttrium-aluminum garnet.

  • Edition Notes

    StatementRoland A. Lowe.
    SeriesNASA technical memorandum -- 106722.
    ContributionsUnited States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15403758M

      The comparative studies of absorption and thermal radiation spectra of three-valent rare-earth ions doped into a aluminum garnet (YAG) selective emitters Cited by: 3. The perfect surface appearance of the film was investigated by atomic force microscopy and Hall-effect measurements revealed a rare p-type conductivity in the LiNbO 3:N thin film. The hole concentration was × 10 15 cm −3 with a field-effect mobility of cm 2 V −1 s −1.

      In a first and completely new approach, a vacuum plasma-spray coating technique was used to deposit selective emitting rare-earth oxide films of ytterbia (Yb 2 O 3) on porous silicon-infiltrated silicon carbide foams (Si–SiC). The plasma-spray coating technique offers a new and promising way to produce selective emitting coatings on different refractory substrates with complex by: 7.   Chubb DL, Pal A-MT, Patton MO, Jenkins PP () Rare earth doped high-temperature ceramic selective emitters. J Eur Ceramic Society – CrossRef Google Scholar

    For example, for 1, the single-crystalline substrates of tungsten and tantalum are typically available in small diameters 1 to cm (area ∼ 3 to 7 cm 2), 33, 57, 58 while naturally selective emitters made of rare earth metals can be on the order of tens of cm 2. 23 – 25 An example for 2 is that electron beam lithography, which is Cited by: 8. Optical waveguides exhibiting non-linear and/or electro-optic properties comprise a rare earth doped barium titanate thin film as an optical working medium. The thin film is metalorganic chemical vapor deposited on a substrate in a reactor to incorporate rare earth atoms in-situ in the barium titanate or other ferroelectric oxide host by:


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Radiative performance of rare earth garnet thin film selective emitters Download PDF EPUB FB2

Been the most successful. A new class of rare earth solid state selective emitters, the rare earth garnets 5, has the potential for being efficient, as well as, more durable than the mantle type emitter.

In this paper we present the emitter efficiency results for the thin film YAG (Yttrium Aluminum Garnet, Y3AI) doped with holmium and erbium. Thin films of high temperature garnet materials such as yttrium aluminum garnet (YAG) doped with rare earths are currently being investigated as selective emitters.

This paper presents a radiative. In this paper we present the first emitter efficiency results for the thin film 40% Er‐% Ho YAG (Yttrium Aluminum Garnet, Y 3 Al 5 O 12) and 25% Ho YAG selective emitter at K with a platinum by: @article{osti_, title = {Radiative performance of rare earth garnet thin film selective emitters}, author = {Lowe, R.A.

and Chubb, D.L. and Good, B.S.}, abstractNote = {In this paper the authors present the first emitter efficiency results for the thin film 40 percent Er percent Ho YAG (Yttrium Aluminum Garnet, Y3Al5O12) and 25 percent Ho YAG selective emitter at K with a.

Emitter efficiency and power density are significantly improved with the addition of multiple rare earth dopants. Predicted efficiency results are presented for an optimized (equal power density in the Er, (4)I(sub 15/2)-(4)I(sub 13/2) at microns, and Ho, (5)I(sub 7)-(5)I(sub 8) at micron emission bands) Er-Ho YAG thin film selective.

Thin film (Ho)‐yttrium aluminum garnet (YAG) and Er‐YAG emitters with a platinum substrate exhibit high spectral emittance in the emission band (ε λ ≊, 4 I 15/2 – 4 I 13/2, for Er‐YAG and ε λ ≊, 5 I 7 – 5 I 8 for Ho‐YAG) at K.

In addition, low out‐of‐band spectral emittance, ε λ Cited by: A film containing a rare earth on a low emittance substrate, which blocks radiation from the thermal source, can be easily attached to any thermal source.

In addition, a film Cited by: 8. We present the emitter efficiency results for the thin film 25 percent Ho YAG (Yttrium Aluminum Garnet, Y3Al5O12) selective emitter from to K with a platinum substrate. We present the emitter efficiency results for the thin film 25 percent Ho YAG (Yttrium Aluminum Garnet, Y3Al5O12) selective emitter from to K with a platinum substrate.

Spectral emittance and emissive power measurements were made ( less than lambda less than microns) and used to calculate the radiative efficiency.

This early research concentrated on thick films of single crystal rare earth garnet selective emitters. Since then I have investigated other types of selective emitters and been a co-principal investigator on a NASA program to develop a radioisotope powered TPV system.

Product Details. Hardcover: pages; Publisher: Elsevier Science (July One way to make this an efficient process is to have the thermal energy source be an efficient selective emitter of radiation.

The emission must be near the bank-gap energy of the photovoltaic cell. One possible method to achieve an efficient selective emitter is the use of a thin film of rare-earth oxides. We present the emitter efficiency results for the thin film 25 percent Ho YAG (Yttrium Aluminum Garnet, Y3Al5O12) selective emitter from to K with a platinum substrate.

Spectral emittance and emissive power measurements were made ( less than lambda less than microns) and used to calculate the radiative efficiency. The radiative efficiency and power density of rare earth doped.

These emitters are thin sections (less than 1 mm) of yttrium aluminum garnet (YAG) single crystal with a rare earth substitutional impurity. This paper presents normal spectral emittance, epsilon(sub lambda), measurements of holmium (Ho), and erbium (Er) doped YAG thin film selective emitters at K, and compares those results with the.

Get this from a library. Radiative performance of rare earth garnet thin film selective emitters. [Roland W Lowe; United States. National Aeronautics and Space Administration.]. This early research concentrated on thick films of single crystal rare earth garnet selective emitters.

Since then I have investigated other types of selective emitters and been a co-principal investigator on a NASA program to develop a radioisotope powered TPV system. Selective emitters for thermophotovoltaics have been produced by vacuum plasma-spray coating of erbium doped garnet Er Y Al 5 O 12 and Er 2 O 3 on the intermetallic alloy MoSi emitters are fully operable in an oxygen-containing atmosphere at a temperature of °C, are highly thermal-shock stable, and show good selective-emitting by: On the other hand, efforts have been made to design selective emitters for far-field TPV systems to improve the conversion efficiency.

Due to the narrowband radiation, rare-earth oxides were the earliest selective emitters [12,13]. Benefiting from the improvement of micro/nanoscale fabrication technique, micro/nanostructured surfaces were also Cited by:   Unprecedented thermophotovoltaic efficiency can be achieved by reflecting low-energy photons back to reheat the blackbody emitter, while utilizing the high-energy photons for photovoltaic electricity generation.

In effect, the semiconductor band edge itself provides spectral selectivity, without the need for a spectrally selective thermal by: 8. Lowe R A, Chubb D L, Farmer S C and Good B S Rare-earth garnet selective emitter Appl.

Phys. Lett. 64 Crossref Petrov V A and Yu Reznik V Measurement of the emissivity of quartz glass High Temp.-High Press. 4 the presence of a selective emitter does not increase the power density available for the PV conversion with respect to a high emissivity material such as SiC, but it reduces losses due to low energy photons and carrier thermalisation.

The effectiveness of Rare-Earth (RE) oxides as spectrally selective emitters was evidenced in by. thin film rare-earth YAG emitter emission from throughout the film contributes to the spectral emittance. Since slgnificent temperature differences ( - 10 exist between the front and back emitter surfaces the effect of the temperature gradient on the radiative performance of the the thin film selective emitter is Investigated.

For the.In the present work, we report for the first time the synthesis of a series of highly crystalline rare-earth iron garnet (RE 3 Fe 5 O 12, RE = Y, Gd–Dy) thin films with cubic networks of interconnected pores averaging 17 nm in diameter through facile polymer templating of hydrated nitrate by: This early research concentrated on thick films of single crystal rare earth garnet selective emitters.

Since then I have investigated other types of selective emitters and been a co-principal investigator on a NASA program to develop a radioisotope powered TPV : Donald Chubb.