Phase change materials for storage media
AssigneeBoard of Trustees operating Michigan State University
InventorMercouri G. Kanatzidis
Life of this patent
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Abstract
Phase-change compounds, and optical storage recording media, for recording and/or storage of data, comprising such compounds, according to the formula XSbySz; wherein X is selected from the group consisting of K, Rb, Tl, Na, Li, Cs and mixtures thereof; and wherein y is about 1 or about 5, and z is about 1 or about B. Preferably, X is K, y is 5 and z is B. Also provided are optical recording media comprising a layer of the phase-change material and methods of creating a reversible phasechange by irradiating the material with a laser radiation.
Claims16
A phase-change storage media comprising a layer of a phase change compound according to the formula XSbySz;
- wherein X is selected from the group consisting of K, Rb, Tl, Na, Li, Cs and mixtures thereof;
- and wherein y is about 5 and z is about 8, or wherein y is about 1 and z is about 2.
A phase-change storage media comprising a layer of a phase change compound according to the formula XSbySz;
- Wherein X is selected from the group consisting of K, Rb, Tl, Na, Li and mixtures thereof;
- and wherein y is about 5 and z is about 8, or wherein y is about 1 and z is about 2.
An optical recording medium comprising a phase-change compound according to the formula XSbySz;
- wherein X is selected from the group consisting of K, Rb, Tl, Na, Li, Cs and mixtures thereof;
- and wherein y is about 5 and z is about 8, or wherein y is about 1 and z is about 2.
A method for a creating a reversible phase-change in a phase change compound according to the formula XSbySz;
- wherein X is selected from the group consisting of K, Rb, Tl, Na, Li, Cs and mixtures thereof;
- and wherein y is about 5 and z is about 8, or wherein y is about 1 and z is about 2, comprising irradiating said compound with a distinct wavelength of laser radiation.
A method for a creating a reversible phasechange in a phase change compound according to the formula XSbySz;
- wherein X is selected from the group consisting of K, Rb, Tl, Na, Li and mixtures thereof;
- and wherein y is about 5 and z is about 8, or wherein y is about 1 and z is about 2, comprising irradiating said compound with a distinct wavelength of laser radiation.
A method for recording data-on an optical recording medium comprising a phase-change compound according to the formula XSbySz;
- wherein X is selected from the group consisting of K, Rb, Tl, Na, Li, Cs and mixtures thereof;
- and wherein y is about 5 and z is about 8, or wherein y is about 1 and z is about 2;
- said method comprising:
- exposing a discrete region of said medium to irradiation at a level sufficient to effect a phase change in said compound.
A method for making a phase-change compound according to the formula XSbySz;
- wherein X is selected from the group consisting of K, Rb, Tl, Na, Li, Cs and mixtures thereof;
- and wherein y is about 5, and z is about 8, the method comprising the steps of:
- (a) combining stoichiometric amounts of metallic X, Sb, and S in a reaction vessel;
- (b) heating the metals under vacuum so as to melt the metals;
- and
- (c) cooling the metals to room temperature.
Dependencies are inferred from the claim text.