Dielectric and functional element

Patent metadata

Field	Value
Publication number	US-2026058068-A1
Application number	US-202519373498-A
Country	US
Kind code	A1
Filing date	Oct 29, 2025
Priority date	May 19, 2023
Publication date	Feb 26, 2026
Grant date	—

Abstract

A dielectric contains an oxide containing hafnium and cerium. The molar ratio of the content of cerium to the sum of the content of hafnium and the content of cerium is greater than or equal to 0.031 and less than or equal to 0.052. The molar ratio of the content of oxygen to the sum of the content of hafnium and the content of cerium is greater than 0 and less than or equal to 1.50.

First claim

What is claimed is:

1 . A dielectric comprising:
an oxide containing hafnium and cerium, wherein a molar ratio of a content of cerium to a sum of a content of hafnium and the content of cerium is greater than or equal to 0.031 and less than or equal to 0.052, and a molar ratio of a content of oxygen to the sum is greater than 0 and less than or equal to 1.50.

2 . The dielectric according to claim 1 , wherein the molar ratio of the content of oxygen to the sum is greater than or equal to 1.44 and less than or equal to 1.50.

3 . The dielectric according to claim 1 , wherein the dielectric has a composition represented by a composition formula Hf 1-x Ce x O y and satisfies 0.031≤x≤0.052 and y≤1.50.

4 . The dielectric according to claim 3 , wherein the dielectric satisfies 1.44≤y≤1.50.

5 . The dielectric according to claim 1 , wherein
the dielectric contains a crystalline phase having a fluorite type crystal structure, and the dielectric is a polycrystalline film.

6 . The dielectric according to claim 1 , wherein
the dielectric contains an orthorhombic crystalline phase, and the dielectric satisfies 0.87≤a/(a+b)≤0.98 in an X-ray diffraction pattern of the dielectric, where a is a peak area of a diffraction peak attributed to reflection from a (111) plane of the orthorhombic crystalline phase in the X-ray diffraction pattern, and b is a peak area of a diffraction peak attributed to reflection from a (001) plane of the orthorhombic crystalline phase in the X-ray diffraction pattern.

7 . A functional element comprising:
a first electrode; a second electrode; and the dielectric according to claim 1 , the dielectric being located between the first electrode and the second electrode.

8 . The functional element according to claim 7 , wherein at least part of the first electrode is porous.

9 . The functional element according to claim 7 , wherein the first electrode contains at least one selected from the group consisting of a metal, a conductive nitride, and a conductive oxide.

10 . The functional element according to claim 7 , wherein the first electrode contains at least one selected from the group consisting of Pt, Au, Al, Ta, and Zr.

11 . The functional element according to claim 7 , wherein the first electrode contains Al.

12 . The functional element according to claim 7 , further comprising:
an electrolyte located between the second electrode and the dielectric, wherein the electrolyte contains at least one selected from the group consisting of an electrolyte solution, a conductive polymer, and manganese oxide.

13 . The functional element according to claim 7 , wherein the functional element is at least one selected from the group consisting of a capacitor, an electro-optic element, a memory element, a transistor, a ferroelectric data storage, a piezoelectric element, and a pyroelectric element.

14 . The functional element according to claim 7 , wherein
the dielectric is in contact with the first electrode, and the second electrode covers at least part of the dielectric.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Morimoto Kota
• Takeuchi Hiroki
• Kikuchi Ryosuke
• AMII Kei

Classifications

• H01G4/1236

  based on zirconium oxides or zirconates (H01G4/1263 takes precedence) · CPC title

• H01G4/1272

  Semiconductive ceramic capacitors · CPC title

• C01G27/00

  Compounds of hafnium · CPC title

• C01P2002/76

  by a space-group or by other symmetry indications · CPC title

• C01P2002/72

  by d-values or two theta-values, e.g. as X-ray diagram · CPC title