Controlled atmosphere process for altering the nonstoichiometry

Details Controlled atmosphere process for altering the nonstoichiometry Controlled atmosphere process for altering the nonstoichiometry

1976-10-08

1978-01-31

Yudkoff, Norman

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

156613, 156DIG83, 427164, 423593, 350 96WG, G02B 514

Patent

active

040713962

ABSTRACT:
The nonstoichiometry of a crystalline member is altered by promoting conditions of vapor phase equilibrium between the member and a slotted crucible in which it is placed. The slotted crucible comprises material sharing a common vapor species with the crystalline member and provides an atmosphere of substantially constant thermodynamic activity with respect to the shared vapor phase upon isothermal heating of the member and crucible. In one embodiment, by achieving a partial vapor phase equilibration between a transparent crystalline member and such a crucible both the magnitude and profile of the refractive index of the member near its surfaces is modified in a controlled member.

REFERENCES:
patent: 3997690 (1976-12-01), Chen
patent: 3998687 (1976-12-01), Ballman et al.
Holman, "Novel Uses of the Thermo-Microbalance in the Determination of Nonstoichiometry in Complex Oxide Systems", J. Vac. Sci. Techol., vol. 11, No. 1, Jan./Feb. 1974, pp, 434-439.
Holman et al., "Intrinsic Nonstoichiometry in the Head Zirconate-Lead Titanate System Determined by Knudsen Effusion", J. Appl. Phys., vol. 44, No. 12, Dec. 1973, pp. 5227-5236.

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