Apparatus for making crystalline composition
View Patent ↗A composition including a polycrystalline metal nitride having a number of grains is provided. These grains have a columnar structure with one or more properties such as, an average grain size, a tilt angle, an impurity content, a porosity, a density, and an atomic fraction of the metal in the metal nitride. An apparatus for preparing a metal nitride is provided. The apparatus may include a housing having an interior surface that defines a chamber and an energy source to supply energy to the chamber. A first inlet may be provided to flow a nitrogen-containing gas into the chamber. Raw materials may be introduced into the chamber through a raw material inlet. A second inlet may be provided to flow in a halide-containing gas in the chamber. The apparatus may further include a controller, which communicates with the various components of the apparatus such as, sensors, valves, and energy source, and may optimize and control the reaction.
1. An apparatus, comprising:
a housing having an interior surface defining a chamber;
an energy source proximate to the housing and operable to supply energy to the chamber;
a first inlet communicating with the chamber and configured to flow a nitrogen-containing gas into the chamber;
a nitrogen-containing gas source, wherein the first inlet communicates with the nitrogen-containing gas source;
a raw material inlet communicating with the chamber and configured to flow a raw material into the chamber wherein the raw material includes a non-gaseous metal;
a second inlet communicating with the chamber and operable to flow a halide-containing gas into the chamber;
a crucible capable of receiving the raw material, and the crucible being located in the chamber relative to the first and the second inlets such that the crucible is downstream of a flow of the nitrogen-containing gas and a flow of the halide-containing gas;
a sensor that is operable to sense one or more of temperature or of pressure in the chamber; a valve that is operable to block a flow to one or more inlet; and
a controller communicating with one or more of the sensor, the valve or the energy source.
2. The apparatus of claim 1 , further comprising a halide-containing gas source and wherein the second inlet further communicates with the halide-containing gas source.
3. The apparatus as defined in claim 1 , wherein the housing further comprises one or both of an outer wall and an inner wall, wherein the inner wall has an inward facing surface configured to be in contact with an environment within the chamber.
4. The apparatus as defined in claim 3 , wherein at least one of the outer wall or the inner wall comprises fused silica.
5. The apparatus as defined in claim 3 , wherein the outer wall and the inner wall are spaced from each other to define a pathway for an environmental control fluid to flow the pathway between the outer wall and the inner wall.
6. The apparatus as defined in claim 3 , wherein the energy source extends along an outward facing surface of the outer wall.
7. The apparatus as defined in claim 3 , further comprising a graphite liner disposed on the inner surface of the inner wall of the housing.
8. The apparatus of claim 7 wherein the liner is removable.
9. The apparatus as defined in claim 1 , wherein the energy source comprises a heater, and the energy supplied by the energy source to the chamber is thermal energy.
10. The apparatus as defined in claim 9 , wherein the energy is provided to the chamber through the housing.
11. The apparatus as defined in claim 1 , further comprising an outlet communicating the chamber to outside of the chamber and being operable to vent gas from inside the chamber to outside the chamber.
12. The apparatus as defined in claim 1 , wherein the crucible comprises one or more of silicon, aluminum, magnesium, boron, zirconium, beryllium, graphite, molybdenum, tungsten, or rhenium.
13. The apparatus as defined in claim 1 , wherein the crucible is a refractory composition comprising an oxide, nitride, or boride.
14. The apparatus as defined in claim 1 , further comprising a point-of-use purifier in communication with at least one inlet.
15. The apparatus as defined in claim 1 , wherein the housing is a vertical furnace or a horizontal furnace.
16. The apparatus as defined in claim 1 , wherein the crucible is one of a plurality of crucibles disposed in the chamber.
17. The apparatus as defined in claim 16 , wherein the plurality of crucibles are stacked vertically relative to each other.
18. The apparatus as defined in claim 16 , wherein the plurality of crucibles are arranged horizontally relative to each other.
19. The apparatus as defined in claim 1 , wherein the number of crucibles is greater than about 6.
20. The apparatus as defined in claim 1 , wherein the raw material consists essentially of a metal.
21. The apparatus as defined in claim 20 , wherein the raw material comprises a liquid.
22. The apparatus of claim 21 wherein the raw material comprises gallium metal.
23. The apparatus as defined in claim 21 , wherein the raw material inlet is configured to flow molten liquid metal raw material therethrough.
24. The apparatus as defined in claim 23 , wherein the raw material inlet has an exit end that is positioned so that molten liquid raw material leaving the exit end flows into the crucible.
25. The apparatus as defined in claim 23 , wherein the raw material inlet defines a plurality of exits and is configured to allow molten liquid raw material to flow into a plurality of crucibles, and each crucible is disposed at a corresponding one of the plurality of exits.
26. The apparatus as defined in claim 1 , further comprising a dopant inlet communicating with the chamber, and that is configured to allow a dopant to flow from a dopant source into the chamber.
27. The apparatus as defined in claim 26 , wherein the dopant inlet is further configured to allow a carrier gas to flow from a carrier gas source into the chamber.
28. The apparatus as defined in claim 1 , wherein the housing has at least one dimension greater than about one meter.
29. The apparatus as defined in claim 1 , wherein the housing comprises quartz or metal.
30. The apparatus as defined in claim 1 , wherein the first inlet and the second inlet are configured to mix the nitrogen containing gas and the halide-containing gas to form a homogeneous gas mixture.