Engineered dielectric meta-materials

Patent metadata

Field	Value
Publication number	US-12567542-B2
Application number	US-201917264687-A
Country	US
Kind code	B2
Filing date	Aug 1, 2019
Priority date	Aug 1, 2018
Publication date	Mar 3, 2026
Grant date	Mar 3, 2026

Abstract

The present disclosure describes a strained dielectric material comprising at least one type of component containing a domain wall variant pattern, or superdomain structure, that is in phase-co-existence with, or in close phase proximity to, a paraelectric state achieved at zero electric field or over a finite range of non-zero electric field, wherein the at least one type of component comprises one or more of an in-plane sub-domain polarization component, a plane-normal sub-domain polarization component, or a solid solution of a ferroelectric.

First claim

What is claimed is:

1 . A strained dielectric material comprising at least one type of component containing a first domain wall variant type that is engineered in phase-co-existence with, or in close phase proximity to, i. a second phase state comprising at least a second component containing a second domain wall variant type or ii. a paraelectric state achieved at zero electric field, wherein the at least one type of component comprises one or more of an in-plane sub-domain polarization component or a plane-normal sub-domain polarization component, characterized in that, the at least one type of component is engineered such that the strained dielectric material exhibits an increased tunability ratio based at least on being engineered in phase-co-existence with, or in close phase proximity to, i. the second phase state or ii. the paraelectric state achieved at zero electric field or over a finite range of non-zero electric field.

2 . A strained dielectric material comprising at least one type of component containing a first domain wall variant type that is in close phase proximity to a second phase state comprising at least a second component containing a second domain wall variant type, wherein the at least one type of component comprises one or more of an in-plane sub-domain polarization component or a plane-normal sub-domain polarization component.

3 . The strained dielectric material of claim 2 , wherein the strained dielectric material is configured as an end member of a solid solution of a ferroelectric.

4 . The strained dielectric material of claim 2 , wherein the strained dielectric material comprises perovskites, BaxSr1-xTiO3 (BSTx), PbTiO3, Pb(Zr,Ti)O3, (Pb,Sr)TiO3, BiFeO3, Bi(Fe,Mn)O3, or Ruddlesden-Popper phases An+1BnX3n+1, or Ruddlesden-Popper phases An+1A′2BnX3n+1 where A and A′ represent alkali and/or alkaline earth metals, B═Ti, and X═O, or other ferroelectrics, or a combination thereof.

5 . The strained dielectric material of claim 4 , wherein x=0.8.

6 . The strained dielectric material of claim 4 , wherein x is between 0.01 and 0.9.

7 . The strained dielectric material of claim 2 , wherein the strained dielectric material is disposed on a substrate.

8 . The strained dielectric material of claim 2 , wherein the strained dielectric material comprises BaTiO3 (BTO) or SrTiO3 (STO), or a combination thereof.

9 . The strained dielectric material of claim 2 , wherein a domain width of the at least one type of component is between 5 nm and 1000 nm.

10 . The strained dielectric material of claim 2 , wherein the strained dielectric material exhibits a stable or meta-stable engineered in-plane strain state (Us) between-2.0% and 2.0% over a temperature range of between 1 mK and 800 K.

11 . The strained dielectric material of claim 2 , wherein at least one of the first or second domain wall variant type comprises c/a/c/a.

12 . The strained dielectric material of claim 2 , wherein at least one of the first or second domain wall variant type comprises ca*/aa*/ca*/aa*.

13 . The strained dielectric material of claim 2 , wherein at least one of the first or second domain wall variant type comprises ca1/ca2/ca1/ca2.

14 . The strained dielectric material of claim 2 , wherein at least one of the first or second domain wall variant type comprises a1/a2/a1/a2.

15 . The strained dielectric material of claim 2 , wherein at least one of the first or second domain wall variant type comprises aa1/aa2/aa1/aa2.

16 . The strained dielectric material of claim 2 , wherein a domain wall variant pattern comprises r1/r2/r1/r2.

17 . The strained dielectric material of claim 2 , wherein at least one of the first or second domain wall variant type comprises a plurality of domain structures comprising c/a/c/a, ca*/aa*/ca*/aa*, ca1/ca2/ca1/ca2, a1/a2/a1/a2, aa1/aa2/aa1/aa2, or r1/r2/r1/r2 or a combination thereof.

18 . The strained dielectric material of claim 2 , wherein growth of material under coherent or partially relaxed tensile strain facilitates location of an intersection of domain wall variant phases at a predetermined temperature.

19 . The strained dielectric material of claim 2 , wherein the dielectric material exhibits in-plane or plane-normal dielectric tunability ratio of n=5:1 to n=10:1, and n=10:1 to n=20:1, and n=20:1 to n=50:1 and n=50:1 to n=100:1, and n=100:1 to n=200:1.

20 . An article comprising the strained dielectric material of claim 2 , the article comprising a radio-frequency tunable filter, a tunable antenna, tunable phase shifter, tunable detector, voltage-tunable oscillator, sensor, actuator or transducer, or impedance matching circuit element.

Assignees

• Univ Drexel
• Epoxtal Llc
• Univ California

Inventors

• Gu Zongquan
• Spanier Jonathan E
• Martin Lane W
• Elsass Christopher R
• Polemi Alessia
• Damodaran Anoop Rama

Classifications

• H10N30/8554

  Lead-zirconium titanate [PZT] based · CPC title

• H10N30/8536

  Alkaline earth metal based oxides, e.g. barium titanates · CPC title

• H01G5/0138

  with movable dielectrics · CPC title

• H10N30/8561

  Bismuth-based oxides · CPC title

• H01G5/0134

  Solid dielectrics · CPC title