Production of crystalline refractory metal oxides containing colloidal metal precipitates and useful as solar-effective absorbers

Patent · 01 January 1983

OSTI ID:864515

Narayan, Jagdish ^[1]; Chen, Yok ^[2]

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1. Knoxville, TN
2. Oak Ridge, TN

This invention is a new process for producing refractory crystalline oxides having improved or unusual properties. The process comprises the steps of forming a doped-metal crystal of the oxide; exposing the doped crystal in a bomb to a reducing atmosphere at superatmospheric pressure and a temperature effecting precipitation of the dopant metal in the crystal lattice of the oxide but insufficient to effect net diffusion of the metal out of the lattice; and then cooling the crystal. Preferably, the cooling step is effected by quenching. The process forms colloidal precipitates of the metal in the oxide lattice. The process may be used, for example, to produce thermally stable black MgO crystalline bodies containing magnetic colloidal precipitates consisting of about 99% Ni. The Ni-containing bodies are solar-selective absorbers, having a room-temperature absorptivity of about 0.96 over virtually all of the solar-energy spectrum and exhibiting an absorption edge in the region of 2 .mu.m. The process parameters can be varied to control the average size of the precipitates. The process can produce a black MgO crystalline body containing colloidal Ni precipitates, some of which have the face-centered-cubic structure and others of which have the body-centered cubic structure. The products of the process are metal-precipitate-containing refractory crystalline oxides which have improved or unique optical, mechanical, magnetic, and/or electronic properties.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
• DOE Contract Number: W-7405-ENG-26
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4376755
• OSTI ID: 864515
• Country of Publication: United States
• Language: English

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/423/126/252/501/
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atmosphere
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average
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black
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body-centered
body-centered cubic
bomb
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colloidal
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cubic
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improved
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metal
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mgo
net
ni-containing
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parameters
precipitates
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preferably
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process parameter
process parameters
produce
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producing refractory
production
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quenching
reducing
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refractory
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room-temperature
size
solar-effective
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spectrum
stable
step
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virtually