Lithium niobite compositions, syntheses, devices, and structures

Patent metadata

Field	Value
Publication number	US-2016010221-A1
Application number	US-201514636654-A
Country	US
Kind code	A1
Filing date	Mar 3, 2015
Priority date	Jun 25, 2009
Publication date	Jan 14, 2016
Grant date	—

Abstract

Metal oxide structures, devices, and fabrication methods are provided. In addition, applications of such structures, devices, and methods are provided. In some embodiments, an oxide material can include a substrate and a single-crystal epitaxial layer of an oxide composition disposed on a surface of the substrate, where the oxide composition is represented by ABO 2 such that A is a lithium cation, B is a cation selected from the group consisting of trivalent transition metal cations, trivalent lanthanide cations, trivalent actinide cations, trivalent p-block cations, and combinations thereof, and O is an oxygen anion. The ABO 2 can be a high purity ABO 2 , with less than 1 atom % each of sodium, carbon, boron, and fluorine. The ABO 2 can be prepared by a liquid phase electro-epitaxy using a molten solution of a metal oxide and LiBO 2 .

First claim

1 . A composition comprising LiNbO 2 , wherein the LiNbO 2 is at least 98% pure.

2 . The composition of claim 1 , wherein the LiNbO 2 is crystalline.

3 . The composition of claim 1 , wherein the LiNbO 2 is at least 99% pure.

4 . The composition of claim 1 , wherein the LiNbO 2 is at least 99.5% pure.

5 . The composition of claim 1 , wherein the LiNbO 2 comprises less than 1 atom % of each of Na, C, F, or B.

6 . The composition of claim 1 , wherein the LiNbO 2 comprises less than 0.5 atom % of each of Na, C, F, or B.

7 . The composition of claim 1 , wherein the LiNbO 2 comprises less than 0.1 atom % of each of Na or C.

8 . The composition of claim 1 , wherein the LiNbO 2 comprises less than 0.1 atom % of each of F or B.

9 . The composition of claim 2 , wherein the full width at half maximum for symmetric XRD double crystal diffraction was less than 400 arc seconds.

10 . The composition of claim 2 , wherein the full width at half maximum for symmetric XRD double crystal diffraction was less than 300 arc seconds.

11 . A method of growing crystalline LiNbO 2 , comprising
inserting a cathode into a molten solution, the solution comprising Nb 2 O 5 and LiBO 2 , attaching an anode to the molten solution, and applying a voltage across the anode and cathode to electrolytically reduce the Nb 2 O 5 and grow the crystalline LiNbO 2 on the cathode.

12 . The method of claim 11 , further comprising a reference electrode electrically connected to the anode and cathode.

13 . The method of claim 11 , wherein the molten solution consists essentially of Nb 2 O 5 and LiBO 2 .

14 . The method of claim 11 , wherein the ratio of Nb 2 O 5 to LiBO 2 is between about 1:10 to about 1:200.

15 . The method of claim 11 , wherein the ratio of Nb 2 O 5 to LiBO 2 is between about 1:15 to about 1:100.

16 . The method of claim 11 , wherein the cathode comprises Nb, Si, GaAs, GaN, SiC, Ta, Ti, or Pt.

17 . The method of claim 11 , wherein the solution of Nb 2 O 5 and LiBO 2 forms a molten solution below 1000° C.

18 . The method of claim 11 , wherein the solution of Nb 2 O 5 and LiBO 2 forms a molten solution below 950° C.

19 . The method of claim 11 , wherein the crystalline LiNbO 2 is at least 98% pure.

20 . The method of claim 11 , wherein the crystalline LiNbO 2 comprises less than 0.5 atom % of each of Na, C, F, or B.

Assignees

• Georgia Tech Res Inst

Inventors

• Doolittle William Alan
• Fabien Chloe A M
• Greenlee Jordan Douglas
• Gunning Brendan Patrick
• Shank Joshua C
• Tellekamp Jr Marshall B

Classifications

• C01P2006/40

  Electric properties · CPC title

• C01P2006/80

  Compositional purity · CPC title

• C25B1/14 Primary

  Alkali metal compounds · CPC title

• C01G33/00

  Compounds of niobium · CPC title

• C25B11/04

  characterised by the material · CPC title