US4153469A — Monocrystals based on stabilized zirconium or haf…

Claim 1

Independent Claim 103 words

Transparent, cubic monocrystals consisting essentially of a metal dioxide selected from the group consisting of zirconium and hafnium, stabilized with yttrium oxide, with the following composition of said components (in mol. %): metal oxide: 70-90 yttrium oxide: 30-10; with said monocrystals exhibiting the following characteristics: a refractive index of n=from 2 to 2.2, and a pass band from 2,000 to 74,000 A; a microhardness of from 1,300 to 1,500 kg/mm 2 ; a dislocation density of from 10 3 to 10 5 cm -2 ; and dimensions of from 1.0 to 8.0 cm in length, and from 0.5 to 4.0 cm in cross-section.

Claim 2

Dependent Claim 103 words

Transparent, cubic monocrystals consisting essentially of a metal dioxide selected from the group consisting of zirconium and hafnium, stabilized with yttrium oxide, with the following composition of said components (in mol. %): metal oxide: 70-90 yttrium oxide: 30-10; with said monocrystals exhibiting the following characteristics: a refractive index of n=from 2 to 2.2, and a pass band from 2,000 to 74,000 A; a microhardness of from 1,300 to 1,500 kg/mm 2 ; a dislocation density of from 10 3 to 10 5 cm -2 ; and dimensions of from 1.0 to 8.0 cm in length, and from 0.5 to 4.0 cm in cross-section.

Claim 3

Dependent Claim 40 words

Transparent, cubic monocrystals as claimed in claim 1, which also contain oxides of elements selected from the group consisting of transition and rare-earth elements, and taken in an amount of from 0.01 to 5% of the weight of the monocrystal.

Claim 4

Independent Claim 111 words

A method of producing transparent, cubic monocrystals based on a dioxide of a metal selected from the group consisting of zirconium and hafnium, said dioxide being stabilized with yttrium oxide; comprising the steps of preparing a charge of said dioxide of a metal selected from the group consisting of zirconium and hafnium, and yttrium oxide in a molar ratio of said metal dioxide to yttrium oxide from 70-90:30-10 respectively; heating said charge to a temperature sufficient to effect melting thereof; and growing the monocrystals from the melt obtained in the open air by withdrawing said charge from the melting zone at a rate of from 2 to 30 mm per hour.

Claim 5

Independent Claim 111 words

A method of producing transparent, cubic monocrystals based on a dioxide of a metal selected from the group consisting of zirconium and hafnium, said dioxide being stabilized with yttrium oxide; comprising the steps of preparing a charge of said dioxide of a metal selected from the group consisting of zirconium and hafnium, and yttrium oxide in a molar ratio of said metal dioxide to yttrium oxide from 70-90:30-10 respectively; heating said charge to a temperature sufficient to effect melting thereof; and growing the monocrystals from the melt obtained in the open air by withdrawing said charge from the melting zone at a rate of from 2 to 30 mm per hour.

Claim 6

Dependent Claim 27 words

A method as claimed in claim 3, wherein said temperature to which said charge is heated to effect melting thereof is within the range of 2800-2900° C.

Claim 7

Dependent Claim 43 words

A method as claimed in claim 3, whereby oxides of elements selected from the group consisting of transition and rare-earth elements are added to the charge during the preparation in an amount of from 0.01 to 5% of the weight of the charge.

Claim 8

Dependent Claim 45 words

A method as claimed in claim 3, whereby oxides of elements selected from the group consisting of transition and rare-earth elements are added to the melt prior to growing the monocrystals in an amount of from 0.01 to 5% of the weight of the charge.

Claim 9

Dependent Claim 70 words

A method as claimed in claim 3, whereby additional oxides of elements are added to the charge during its preparation and to the melt prior to growing the monocrystals, said additional oxides of elements being selected from the group consisting of the transition and the rare-earth elements, in which case the total amount of the oxides added is from 0.01 to 5% of that of the weight of the charge.

Claim 10

Dependent Claim 23 words

A method as claimed in claim 5, whereby the monocrystals are grown at a rate of from 2 to 10 mm per hour.

Claim 11

Dependent Claim 23 words

A method as claimed in claim 6, whereby the monocrystals are grown at a rate of from 2 to 10 mm per hour.

Claim 12

Dependent Claim 23 words

A method as claimed in claim 7, whereby the monocrystals are grown at a rate of from 2 to 10 mm per hour.

Claim 13

Dependent Claim 14 words

Transparent, cubic monocrystals produced in accordance with the method as claimed in claim 3.

Claim 14

Dependent Claim 14 words

Transparent, cubic monocrystals produced in accordance with the method as claimed in claim 4.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1982-05-07	1982-11-06	1983-05-08	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1986-05-07	1986-11-06	1987-05-08	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1990-05-07	1990-11-06	1991-05-08	$7700.00	Window Closed / Lapsed

Monocrystals based on stabilized zirconium or hafnium dioxide and method of production thereof

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