Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Rare earth orthoferrite monocrystal growth method and application

A technology of orthoferrite and growth method, which is applied in the preparation of ferromagnetic metal oxide functional materials and the preparation of rare earth element iron oxide functional materials, can solve the problem that it is difficult to determine the crystal and affect the rare earth orthoferrite single crystal material. Physical properties, affecting device performance and other issues, to achieve the effects of good crystal integrity, high crystal growth efficiency, and high crystal quality

Inactive Publication Date: 2014-08-20
SHANGHAI UNIV
View PDF5 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the rare earth orthoferrite has an orthorhombic perovskite structure, the rare earth orthoferrite single crystal grown by the optical floating zone method is generally cylindrical, and it is difficult to determine the three directions of a, b, and c of the crystal, so that Affects the physical properties of rare earth orthoferrite single crystal materials, and its application affects the performance of devices

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Rare earth orthoferrite monocrystal growth method and application
  • Rare earth orthoferrite monocrystal growth method and application
  • Rare earth orthoferrite monocrystal growth method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In this example, Gd 0.9 La 0.1 FeO 3 A method for growing a single crystal, comprising the steps of:

[0022] a. First, Gd with a purity of 99.99% 2 o 3 and La 2 o 3 and Fe 2 o 3 Weighing and precise proportioning were carried out according to the specified molar ratio, the mixed powder was fully ground in an agate mortar for 8 hours and mixed evenly, the first pre-fired was kept in air at 800 °C for 12 hours, and then cooled down to room temperature naturally with the furnace. Prepare polycrystalline powders of Gd and La rare earth elements and iron oxides; put them back in an agate mortar and grind them fully, then put the polycrystalline powders into a mold, and press the fully ground powders under a pressure of 20MPa to form The polycrystalline wafer blank with a diameter of 25 mm and a thickness of 4 mm is sintered for the second time in a high-temperature furnace at a temperature of 1300 ° C, and kept for 24 hours to obtain a polycrystalline wafer; then th...

Embodiment 2

[0028] This embodiment is basically the same as Embodiment 1, especially in that:

[0029] In this example, HoMn 0.05 Fe 0.95 o 3 A method for growing a single crystal, comprising the steps of:

[0030] a. First, the Ho element oxide with a purity of 99.99% and Mn 2 o 5 and Fe 2 o 3 Weighing and precise proportioning were carried out according to the specified molar ratio, the mixed powder was fully ground in an agate mortar for 8 hours and mixed evenly, the first pre-fired was kept in air at 800 °C for 12 hours, and then cooled down to room temperature naturally with the furnace. Prepare polycrystalline powders of Ho element oxides, Mn oxides and iron oxides; then put them back in an agate mortar for full grinding, then put the polycrystalline powders into a mold, and under a pressure of 20MPa, the fully ground The powder is pressed into a polycrystalline wafer blank with a diameter of 20mm and a thickness of 4mm, and then sintered for the second time in a high-tempera...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a rare earth orthoferrite monocrystal growth method. First crystal growth is carried out by an optical float zone growth method to obtain monocrystals in one direction; and then, the monocrystals are used as seed crystal bars for cyclic growth so as to obtain monocrystals in three directions. The invention also discloses an application of the rare earth orthoferrite monocrystal growth method in the preparation of a rare earth orthoferrite monocrystal material. According to the invention, characteristics of a rare earth material are combined, the optical float zone growth method is used, and technological parameters such as monocrystal growth speed, charge bar rotational speed and air flow, etc. are controlled so as to obtain a stable melt; and monocrystals are used as seed crystal bars so as to cyclically grow rare earth orthoferrite RFeO3 functional monocrystals in definite three crystallographic directions a, b, c. During the whole preparation process, there is no corrosion or pollution, crystal perfection is good, crystalline quality is good, crystal growth efficiency is high, and repeatability is good.

Description

technical field [0001] The invention relates to a preparation process of a ferromagnetic metal oxide functional material, in particular to a preparation method of a rare earth element iron oxide functional material, which is applied in the technical field of rare earth functional materials and its preparation. Background technique [0002] Functional materials, as the basic technology of the 21st century, play a decisive role in the technology industries of electronics, information, machinery, aviation and communication. The rare earth orthoferrite RFeO 3 Materials, where R is Y or other rare earth elements, because of their rich physical properties, such as spin reorientation phase transition, magneto-optic effect and multiferroicity, have a wide range of application prospects and become a major research field in the field of physics and materials. hotspot. The novel physical properties exhibited by different rare earth element iron oxides have attracted great attention f...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C30B13/00C30B29/24C30B29/22
Inventor 王冠伟袁淑娟张金仓曹世勋
Owner SHANGHAI UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com