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US4587172A
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Mirror substrate of atomically substituted Na Zr2 PO12 low expansion ceramic material
Assignee: Applied Biosystems Inc
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Filing: 1984-06-01
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Granted: 1986-05-06
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Expires: 2004-06-01
Abstract
Abstract A low expansion ceramic material has a composition represented by the molecular formula i (Na) j (Zr 2-z Na 4z ) k (P 3-x Na x Si x )O 12 in which the molar proportions i, j and k are each within the range from about 0.9 to about 1.1, and i+j+k equal 3; and, for molar proportions i, j and k each equal to 1.0, the ceramic composition falls within the area defined by the points A, B, C and D in a quarternary diagram of SiO 2 , Na 2 O, P 2 O 5 and ZrO 2 , the coordinates of the points being: A: x=0.2, z=0 B: x=0.6, z=0 C: x=0, z=0.25 D: x=0, z=0.125 The ceramic material is especially suitable as a substrate for optically reflecting films.
Inventors
- 👤 Rustum Roy
- 👤 Jaime Alamo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:06
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/08; C; C04; C04B; C04B35/00; C04B35/01; C04B35/447; G02B1/00; G02B1/02; Y; Y10; Y10S; Y10S359/00; Y10S359/90
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
168 words
An optical reflector characterized by resistance to distortion and fracture under variations in temperature, which comprises: a substrate fabricated of low expansion (25° C.-500° C.) ceramic material and an optically reflecting film deposited on the substrate, the ceramic material being of single phase crystal structure having a composition represented by a molecular formula i (Na) j (Zr 2-z Na 4z ) k (P 3-x Na x Si x )O 12 where i, j and k represent molar proportions and x and z represent atomic proportions of constituents respectively of the ceramic material, wherein: molar proportions i, j and k are individually in the range from about 0.9 to about 1.1, and i+j+k is equal to 3; and for molar proportions i, j and k individually equal to 1.0, the composition falls within the area defined by the points A, B, C and D in the quaternary diagram of FIG. 2, the coordinates of the points being: A: x=0.2, z=0 B: x=0.6, z=0 C: x=0, z=0.25 D: x=0, z=0.125
Claim 2
Dependent Claim
168 words
An optical reflector characterized by resistance to distortion and fracture under variations in temperature, which comprises: a substrate fabricated of low expansion (25° C.-500° C.) ceramic material and an optically reflecting film deposited on the substrate, the ceramic material being of single phase crystal structure having a composition represented by a molecular formula i (Na) j (Zr 2-z Na 4z ) k (P 3-x Na x Si x )O 12 where i, j and k represent molar proportions and x and z represent atomic proportions of constituents respectively of the ceramic material, wherein: molar proportions i, j and k are individually in the range from about 0.9 to about 1.1, and i+j+k is equal to 3; and for molar proportions i, j and k individually equal to 1.0, the composition falls within the area defined by the points A, B, C and D in the quaternary diagram of FIG. 2, the coordinates of the points being: A: x=0.2, z=0 B: x=0.6, z=0 C: x=0, z=0.25 D: x=0, z=0.125
Claim 3
Dependent Claim
127 words
An optical reflector characterized by resistance to distortion and fracture under variations in temperature, which comprises: a substrate fabricated of low expansion (25° C.-500° C.) ceramic material, and an optically reflecting film deposited on the substrate, the ceramic material being of single phase crystal structure having a composition represented by the molecular formula i (Na) j (Zr 2 ) k (P 3-x Na x Si x )O 12 where i, j and k represent molar proportions of constituents respectively of the ceramic composition, wherein: molar proportions i, j and k are individually in the range from about 0.9 to about 1.1, and i+j+k is equal to 3; and the composition falls within limits defined by atomic proportion x having a value in the range 0.4 to 0.6.
Claim 4
Dependent Claim
127 words
An optical reflector characterized by resistance to distortion and fracture under variations in temperature, which comprises: a substrate fabricated of low expansion (25° C.-500° C.) ceramic material, and an optically reflecting film deposited on the substrate, the ceramic material being of single phase crystal structure having a composition represented by the molecular formula i (Na) j (Zr 2 ) k (P 3-x Na x Si x )O 12 where i, j and k represent molar proportions of constituents respectively of the ceramic composition, wherein: molar proportions i, j and k are individually in the range from about 0.9 to about 1.1, and i+j+k is equal to 3; and the composition falls within limits defined by atomic proportion x having a value in the range 0.4 to 0.6.
Claim 5
Dependent Claim
125 words
An optical reflector characterized by resistance to distortion and fracture under variations in temperature, which comprises: a substrate of low expansion (25° C.-500° C.) ceramic material, and an optically reflecting film deposited on the substrate, the ceramic material being of single phase crystal structure having a composition represented by a molecular formula i (Na) j (Zr 2-z Na 4z ) k (P 3 )O 12 where i, j and k represent molar proportions of constituents respectively of the ceramic composition, wherein: molar fractions i, j and k are individually in the range of about 0.9 to about 1.1, and i+j+k is equal to 3; and the ceramic composition falls within limits defined by atomic proportion z having a value in the range 0.125 and 0.25.
Claim 6
Dependent Claim
125 words
An optical reflector characterized by resistance to distortion and fracture under variations in temperature, which comprises: a substrate of low expansion (25° C.-500° C.) ceramic material, and an optically reflecting film deposited on the substrate, the ceramic material being of single phase crystal structure having a composition represented by a molecular formula i (Na) j (Zr 2-z Na 4z ) k (P 3 )O 12 where i, j and k represent molar proportions of constituents respectively of the ceramic composition, wherein: molar fractions i, j and k are individually in the range of about 0.9 to about 1.1, and i+j+k is equal to 3; and the ceramic composition falls within limits defined by atomic proportion z having a value in the range 0.125 and 0.25.
Claim 7
Independent Claim
170 words
A method of supporting an optically reflecting film so as to resist distortion and fracture under variations in temperature, which comprises providing a substrate for the optically reflecting film, the substrate being a low expansion (25° C.-500° C.) ceramic material of a single phase crystal structure having a composition represented by the molecular formula i (Na) j (Zr 2-z Na 4z ) k (P 3-x Na x Si x )O 12 where i, j and k represent molar fractions and x and z represent atomic fractions of constituents respectively of the ceramic composition, wherein: molar fractions i, j and k are individually in the range from about 0.9 to about 1.1, and i+j+k is equal to 3; and for molar proportions i, j and k individually equal to 1.0, the ceramic composition falls within the area defined by the points A, B, C and D in the quaternary diagram of FIG. 2, the coordinates of the points being: A: x=0.2, z=0 B: x=0.6, z=0 C: x=0, z=0.25 D: x=0, z=0.125
Claim 8
Independent Claim
170 words
A method of supporting an optically reflecting film so as to resist distortion and fracture under variations in temperature, which comprises providing a substrate for the optically reflecting film, the substrate being a low expansion (25° C.-500° C.) ceramic material of a single phase crystal structure having a composition represented by the molecular formula i (Na) j (Zr 2-z Na 4z ) k (P 3-x Na x Si x )O 12 where i, j and k represent molar fractions and x and z represent atomic fractions of constituents respectively of the ceramic composition, wherein: molar fractions i, j and k are individually in the range from about 0.9 to about 1.1, and i+j+k is equal to 3; and for molar proportions i, j and k individually equal to 1.0, the ceramic composition falls within the area defined by the points A, B, C and D in the quaternary diagram of FIG. 2, the coordinates of the points being: A: x=0.2, z=0 B: x=0.6, z=0 C: x=0, z=0.25 D: x=0, z=0.125
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