Tunable low loss material composition

• US 7,557,055 B2
• Filed: 11/18/2004
• Issued: 07/07/2009
• Est. Priority Date: 09/20/2004
• Status: Active Grant

• Current Assignee: NXP USA, Inc. (NXP Semiconductors NV)
• Original Assignee: Paratek Microwave Incorporated (Blackberry Limited)
• Inventors: Underhill, Elijah, Sengupta, Louise C., Zhang, Xubai
• Primary Examiner(s): GROUP, KARL E
• Application Number:
  US10/991,924
• Publication Number:
  US 20060060900A1
• Time in Patent Office: 1,692 Days
• Field of Search: 501/134, 501/135, 501/136, 501/137, 501/138, 501/139, 252/62.9 R, 252/62.9 PZ
• US Class Current: 501/135
• CPC Class Codes: C04B 2235/3206 Magnesium oxides or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3208 Calcium oxide or oxide-forming salts thereof, e.g. lime
• CPC Class Codes: C04B 2235/3213 Strontium oxides or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3215 Barium oxides or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3224 Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide
• CPC Class Codes: C04B 2235/3225 Yttrium oxide or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3229 Cerium oxides or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3251 Niobium oxides, niobates, tantalum oxides, tantalates, or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3284 Zinc oxides, zincates, cadmium oxides, cadmiates, mercury oxides, mercurates or oxide forming salts thereof
• CPC Class Codes: C04B 2235/3418 Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
• CPC Class Codes: C04B 2235/3436 Alkaline earth metal silicates, e.g. barium silicate
• CPC Class Codes: C04B 2235/3445 Magnesium silicates, e.g. forsterite
• CPC Class Codes: C04B 2235/3454 Calcium silicates, e.g. wollastonite
• CPC Class Codes: C04B 2235/36 Glass starting materials for making ceramics, e.g. silica glass
• CPC Class Codes: C04B 2235/6025 Tape casting, e.g. with a doctor blade
• CPC Class Codes: C04B 2235/768 Perovskite structure ABO3
• CPC Class Codes: C04B 35/4682 based on BaTiO3 perovskite phase
• CPC Class Codes: C04B 35/47 based on strontium titanates

Abstract

An embodiment of the present invention provides an electronically tunable dielectric material, comprising at least one electronically tunable dielectric phase and at least one compound of low loss complex perovskites. The at least one electronically tunable dielectric phase may be selected from the group consisting of barium strontium titanate, barium titanate, strontium titanate, barium calcium titanate, barium calcium zirconium titanate, lead titanate, lead zirconium titanate, lead lanthanum zirconium titanate, lead niobate, lead tantalate, potassium strontium niobate, sodium barium niobate/potassium phosphate, potassium niobate, lithium niobate, lithium tantalate, lanthanum tantalate, barium calcium zirconium titanate, sodium nitrate, and combinations thereof. Further, the barium strontium titanate may of the formula BaxSr1-xTiO3, where x is from about 0 to about 1, or more specifically, but not limited in this respect, may also be of the formula BaxSr1-xTiO3, where x may be from about 0.15 to about 0.65 or from about 0.25 to about 0.60.

Claims

1. An electronically tunable dielectric material, comprising:

at least one electronically tunable dielectric phase;

at least one compound of low loss complex perovskites;

wherein the compound of low loss complex perovskites comprises from about 0.001 to about 50 weight percent of the material; and

wherein the compound of low loss complex perovskites comprises A[B1_1/3B2_2/3]O₃ materials, where A=Ba, Sr or the combination of Ba and Sr;

B1=Mg, Zn or the combination of Mg and Zn;

B2=Ta, Nb or the combination of Ta and Nb.

2. The electronically tunable dielectric material of claim 1, wherein the at least one electronically tunable dielectric phase is selected from the group consisting of:

barium strontium titanate, barium titanate, strontium titanate, barium calcium titanate, barium calcium zirconium titanate, lead titanate, lead zirconium titanate, lead lanthanum zirconium titanate, lead niobate, lead tantalate, potassium strontium niobate, sodium barium niobate/potassium phosphate, potassium niobate, lithium niobate, lithium tantalate, lanthanum tantalate, barium calcium zirconium titanate, sodium nitrate, and combinations thereof.

3. The electronically tunable dielectric material of claim 1, wherein the at least one electronically tunable dielectric phase comprises barium strontium titanate.

4. The electronically tunable dielectric material of claim 3, wherein the barium strontium titanate is of the formula Ba_xSr₁₋

xTiO₃, where x is greater than 0 and smaller than 1.

5. The electronically tunable dielectric material of claim 3, wherein the barium strontium titanate is of the formula Ba_xSr₁₋

xTiO₃, where x is from about 0.15 to about 0.65.

6. The electronically tunable dielectric material of claim 3, wherein the barium strontium titanate is of the formula Ba_xSr₁₋

xTiO₃, where x is from about 0.25 to about 0.60.

7. The electronically tunable dielectric material of claim 1, wherein the compound of low loss complex perovskites comprises from about 0.01 to about 20 weight percent of the material.

8. The electronically tunable dielectric material of claim 1, wherein the compound of low loss complex perovskites comprises from about 0.1 to about 5 weight percent of the material.

9. The electronically tunable dielectric material of claim 1, wherein said material is a composite comprising said electronically tunable material further combined with and at least one other family of materials.

10. The electronically tunable dielectric material of claim 9, wherein said other family of materials is selected from the group consisting of:

rare earth oxides, glasses, metal silicates, metal oxides and/or metal titanates.

11. The electronically tunable dielectric composite of claim 10, wherein said rare earth oxides are selected from the group consisting of:

oxides of scandium (Sc), yttrium (Y), lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), lutetium (Lu) and any combination of the above.

12. The electronically tunable dielectric composite of claim 10, wherein said rare earth oxides are selected from the group consisting of:

Sc, Y, La, Ce, Pr, Nd, Sm, Dy, Gd, Ho and/or Er.

13. The electronically tunable dielectric composite of claim 10, wherein said rare earth oxide comprises CeO₂.

14. The electronically tunable dielectric composite of claim 10, wherein the percentage of rare earth oxides comprises from about 0.001 to about 5 mole percent of the electronically tunable dielectric phase.

15. The electronically tunable dielectric composite of claim 10, wherein the percentage of rare earth oxides comprises from about 0.01 to about 3 mole percent of the electronically tunable dielectric phase.

16. The electronically tunable dielectric composite of claim 10, wherein the rare earth oxides comprises from about 0.1 to about 2 mole percent of the electronically tunable dielectric phase.

17. The electronically tunable dielectric composite of claim 10, wherein the glasses comprises from boron, barium, calcium, lithium, manganese, silicon, zinc and/or aluminum-containing glasses.

18. The electronically tunable dielectric composite of claim 10, wherein the glasses comprises an amount up to 50 weight percent of the materials.

19. The electronically tunable dielectric composite of claim 10, wherein the glasses comprises from about 0.1 to about 25 weight percent of the materials.

20. The electronically tunable dielectric composite of claim 10, wherein said metal silicates comprises metals from group 2A of the Periodic Table.

21. The electronically tunable dielectric composite of claim 10, wherein the metal silicates are selected from the group consisting of:

Mg₂SiO₄, CaSiO₃, BaSiO₃ and SrSiO₃.

22. The electronically tunable dielectric composite of claim 10, wherein the metal silicates comprises from about 0.1 to about 80 weight percent.

23. The electronically tunable dielectric composite of claim 10, wherein the metal silicates comprises from about 5 to about 60 weight percent.

24. The electronically tunable dielectric composite of claim 10, wherein the metal silicates comprises from about 0.01 to about 1 weight percent.