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An insulated glass unit (IGU) comprises a first pane of a transparent material and a second pane of a transparent material. The second pane is spaced apart from the first pane to define a cavity therebetween. At least one of a spacer and an array of stand-off members is disposed between the first an

An insulated glass unit (IGU) comprises a first pane of a transparent material and a second pane of a transparent material. The second pane is spaced apart from the first pane to define a cavity therebetween. At least one of a spacer and an array of stand-off members is disposed between the first and second panes to maintain separation therebetween. A first adhesive layer forms at least a portion of a gas-tight connection between the first pane and the second pane. A highly gas-restrictive coating is disposed over the adhesive layer, where the coating is an inorganic layer.

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1. An insulated glass unit (IGU), comprising: a first pane of a transparent material;a second pane of a transparent material, the second pane being spaced apart from the first pane to define a cavity therebetween, wherein each of the first and second panes has a respective cavity-facing surface that

1. An insulated glass unit (IGU), comprising: a first pane of a transparent material;a second pane of a transparent material, the second pane being spaced apart from the first pane to define a cavity therebetween, wherein each of the first and second panes has a respective cavity-facing surface that faces toward the cavity;an inert fill-gas disposed within the cavity;a spacer member bonded to the first pane with a first adhesive layer disposed between portions of the spacer member and the first pane, the first adhesive layer forming a first portion of a first gas-tight connection between the first pane and the spacer member and having a cavity-facing surface facing the cavity; anda gas-restrictive coating disposed continuously over both the entire cavity-facing surface of the first adhesive layer and the entire cavity-facing surface of the first pane and forming a second portion of the first gas-tight connection, where the gas-restrictive coating is an inorganic layer having a leak rate of the fill-gas from the cavity through the gas-restrictive coating of less than 1% of the cavity volume per year. 2. An IGU in accordance with claim 1, wherein the fill-gas is at least one of argon, krypton, xenon or sulfur hexaflouride. 3. An IGU in accordance with claim 1, wherein the second pane is bonded to the spacer member with a second adhesive layer, the second adhesive layer forming a first portion of a second gas-tight connection between the second pane and the spacer member and having a cavity-facing surface that faces toward the cavity. 4. An IGU in accordance with claim 3, further comprising a gas-restrictive coating disposed over both the entire cavity-facing surface of the second adhesive layer and the entire cavity-facing surface of the second pane and forming a second portion of the second gas-tight connection between the second pane and the spacer member, where the gas-restrictive coating is an inorganic layer having a leak rate of the fill gas from the cavity through the gas-restrictive coating of less than 1% of the cavity volume per year. 5. An IGU in accordance with claim 1: wherein the second pane is bonded to the spacer member with a second adhesive layer, the second adhesive layer forming a first portion of a second gas-tight connection between the second pane and the spacer member and having a cavity-facing surface facing the cavity;wherein the spacer member has a cavity-facing surface that faces toward the cavity; andwherein the gas-restrictive coating is further disposed continuously over the cavity-facing surface of the spacer member, the cavity-facing surface of the second adhesive layer and the entire cavity-facing surface of the second pane. 6. An insulated glass unit (IGU), comprising: a first pane of a transparent material;a second pane of a transparent material, the second pane being spaced apart from the first pane to define a cavity therebetween;a fill-gas disposed in the cavity between the first and second panes, the fill-gas being at least one of argon, krypton, xenon or sulfur hexaflouride;a first adhesive layer of a non-gas-restrictive bonding material disposed around the periphery of the cavity between portions of the first and second panes and forming a first portion of a structural connection between the first and the second panes;each of the first and second panes and the first adhesive layer having respective cavity-facing surfaces that face toward the cavity; anda gas-restrictive coating layer of an inorganic material coating continuously over at least the entire cavity-facing surface of the first adhesive layer and the entire respective cavity-facing surface of at least one of the first and second panes, where the gas-restrictive coating is an inorganic layer having a leak rate of the fill-gas from the cavity through the gas-restrictive coating of less than 1% of the cavity volume per year. 7. An IGU in accordance with claim 6, wherein the structural connection between the first and second panes further comprises: a first frame disposed around the periphery of the cavity and having a first portion attached to the first pane by the first adhesive layer and a second portion;a second adhesive layer of a non-gas-restrictive bonding material, the second adhesive layer being attached around the periphery of the cavity between the second portion of the first frame and the second pane and having a cavity-facing surface facing the cavity; andwherein the gas-restrictive coating layer further extends continuously over the entire cavity-facing surface of the second adhesive layer and the entire cavity-facing surface of the other of the first and second panes. 8. An IGU in accordance with claim 7, wherein the first and second adhesive layers and overlying gas-restrictive coating layer have a leak rate of the fill-gas from the cavity through the adhesive layers and gas-restrictive coating layer of less than 1% of the cavity volume per year. 9. An IGU according to claim 6, wherein the inorganic material of the gas-restrictive coating layer comprises at least 90% alumina. 10. An IGU according to claim 6, wherein the gas-restrictive coating layer has a thickness from 0.4 nm to 1 μm. 11. An IGU according to claim 6, wherein the first and second adhesive layers each have respective outside-facing surfaces that face away from the cavity, and a second gas-restrictive coating layer coats the outside-facing surface of at least one of the first and second adhesive layers. 12. A method for manufacturing an insulated glass unit (IGU), the method comprising the following steps: providing a first pane of a transparent material having a cavity-facing surface defined thereon;affixing a first adhesive layer of a non-gas-restrictive bonding material around the periphery of the cavity-facing surface of the first pane, the first adhesive layer defining a respective cavity-facing surface;jointly coating the respective entire cavity-facing surface of the first pane and the entire cavity-facing surface of the first adhesive layer with a first continuous gas-restrictive coating layer of an inorganic material;providing a second pane of a transparent material having a respective cavity-facing surface defined thereon, the second pane being spaced apart from the first pane to define a cavity therebetween;operatively connecting the first pane, the first continuous gas-restrictive coating layer and the second pane to one another to form a gas-restrictive seal around the cavity;providing an inert fill-gas in the cavity between the first and second panes; andwherein the gas-restrictive coating is an inorganic layer having a leak rate of the inert fill-gas from the cavity through the gas-restrictive coating of less than 1% of the cavity volume per year. 13. A method in accordance with claim 12, further comprising the following steps: affixing a second adhesive layer of a non-gas-restrictive bonding material around the periphery of the cavity-facing surface of the second pane, the second adhesive layer defining a respective cavity-facing surface;jointly coating the respective entire cavity-facing surface of the second pane and the entire cavity-facing surface of the second adhesive layer with a second continuous gas-restrictive coating layer of an inorganic material. 14. A method in accordance with claim 13, wherein the step of jointly coating the respective cavity-facing surfaces of the first pane and the first adhesive layer with a first continuous gas-restrictive coating layer and the step of jointly coating the respective cavity-facing surfaces of the second pane and the second adhesive layer with a second continuous gas-restrictive coating layer are both performed simultaneously. 15. A method in accordance with claim 12, wherein the step of jointly coating the respective cavity-facing surfaces of the first pane and the first adhesive layer with the first continuous gas-restrictive coating layer is performed by chemical deposition. 16. A method in accordance with claim 12, wherein the step of jointly coating the respective cavity-facing surfaces of the first pane and the first adhesive layer with the first continuous gas-restrictive coating layer is performed by physical vapor deposition. 17. A method in accordance with claim 12, wherein the step of jointly coating the respective cavity-facing surfaces of the first pane and the first adhesive layer with the first continuous gas-restrictive coating layer is performed by atomic layer deposition (ALD).