1. A transition metal oxide insulator composition having a tuned band gap comprising:
a. a transition metal oxide having a crystalline structure selected from the group consisting of a perovskite crystalline structure and a perovskite-like crystalline structure, said transition metal oxide comprising: at least one first element selected from the group consisting of Bi, Ca, Ba, Sr, Li, Na, Mg, K, Pb, and Pr; and at least one second element selected from the group consisting of Ti, Al, V, Cr, Mn, Fe, Co, Ni, Cu, Zr, Nb, Mo, Ru, Rh, Pd, Hf, Ta, W, Re, Os, Ir, and Pt; and
b. at least one correlated insulator integrated into said crystalline structure, said correlated insulator comprising REMO3, wherein RE is at least one element selected from the group consisting of La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu, and wherein M is at least one element selected from the group consisting of Co, V, Cr, Ni, Mn, and Fe;
said composition being characterized by a band gap of less than 4.5 eV.
2. A transition metal oxide insulator composition in accordance with claim 1 wherein said crystalline structure is selected from the group consisting of a layered tetragonal crystalline structure and a pseudo-orthorhombic crystalline structure.
3. A transition metal oxide insulator composition in accordance with claim 1 wherein said first element comprises Bi.
4. A transition metal oxide insulator composition in accordance with claim 1 wherein said second element comprises Ti.
5. A transition metal oxide insulator composition in accordance with claim 1 wherein RE comprises La.
6. A transition metal oxide insulator composition in accordance with claim wherein M comprises Co.
7. A transition metal oxide insulator composition in accordance with claim 1 wherein said correlated insulator comprises LaCoO3.
8. A transition metal oxide insulator composition in accordance with claim 1 wherein said band gap is less than 4.0 eV.
9. A transition metal oxide insulator composition in accordance with claim 1 further comprising a substrate upon which said transition metal oxide insulator composition is disposed.
10. A transition metal oxide insulator composition in accordance with claim 9 wherein said transition metal oxide insulator composition is disposed epitaxially on said substrate.
11. A transition metal oxide insulator composition in accordance with claim 9 wherein said substrate comprises at least one material selected from the group consisting of Si, Ge, SrTiO3, LaAlO3, BaTiO3, CaTiO3, (LaAlO3)6(Sr2AlTaO6)7, SrTiO3Si, YSZ, and YSZSi.
12. A transition metal oxide insulator composition in accordance with claim 1 wherein said transition metal oxide comprises Bi4Ti3O12 and wherein said correlated insulator comprises LaCoO3.
13. A transition metal oxide insulator composition in accordance with claim 1 wherein said composition corresponds to the formula 1Bi4Ti3O12\u20141LaCoO3.
14. A transition metal oxide insulator composition in accordance with claim 1 wherein said composition corresponds to the formula 1Bi4Ti3O12\u20142LaCoO3.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A varnish composition comprising:
composition (A): an epoxy resin including:
composition (A-1): a phosphorus containing epoxy resin, a phosphorus and silicon containing epoxy resin, or a mixture thereof;
composition (A-2): dicyclopentadiene epoxy resin; and
composition (A-3): oxazolidone epoxy resin;
composition (B): a hardener, wherein the hardener of composition (B) is a polymer of styrene and maleic acid anhydride, a benzoxazine resin, or a mixture thereof;
composition (C): an accelerant;
composition (D): phosphorus-containing flame retardant; and
composition (E): fillers,
wherein the dicyclopentadiene epoxy resin of composition (A-2) is shown as formula 4:
wherein \u201ci\u201d represents a number of repeat units.
2. A prepreg prepared by applying the varnish composition of claim 1 to a composite fabric.
3. A substrate of printed circuit board prepared by laminating the prepreg of claim 2.
4. The varnish composition according to claim 1, wherein the phosphorus-containing epoxy resin of composition (A-1) is an epoxy resin formed with a phosphorus-containing reactant selected from the group consisting of formula 1, formula 2, and formula 3 as listed below:
5. The varnish composition according to claim 1, wherein the phosphorus and silicon containing epoxy resin of composition (A-1) is an epoxy resin formed with a silicon-containing reactant and a phosphorus-containing reactant selected from the group consisting of formula 1, formula 2, and formula 3 as listed below:
6. The varnish composition according to claim 1, wherein the oxazolidone epoxy resin of composition (A-3) is shown as formula 5:
7. The varnish composition according to claim 1, wherein the composition (A) further includes composition (A-4): naphthalene epoxy resin.
8. The varnish composition according to claim 7, wherein the naphthalene epoxy resin of composition (A-4) is shown as formula 6:
wherein \u201cn\u201d represents a number of repeat units.
9. The varnish composition according to claim 1, wherein the benzoxazine resin of composition (B) is shown as formula 7:
wherein \u201cR\u201d is a composition selected from the group consisting of S, CH2,