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Growth method and application of rare earth orthoferrite single crystal

A technology of orthoferrite and growth method, which is applied in the preparation of rare earth element iron oxide functional materials and the preparation of ferromagnetic metal oxide functional materials, can solve the problem of affecting device performance and affecting the physical properties of rare earth orthoferrite single crystal materials , Difficult to fix problems such as crystals, to achieve the effect of high crystal quality, good crystal integrity, and high crystal growth efficiency

Inactive Publication Date: 2016-05-25
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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  • Growth method and application of rare earth orthoferrite single crystal
  • Growth method and application of rare earth orthoferrite single crystal
  • Growth method and application of rare earth orthoferrite single crystal

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 Weigh and accurately mix according to the specified molar ratio, put the mixed powder in an agate mortar and grind it for 8 hours to mix evenly, the first pre-calcination is kept in the air at 800°C for 12 hours, and naturally cool down to room temperature with the furnace to prepare Gd and polycrystalline powder of La rare earth elements and iron oxides; then put it back in an agate mortar and grind it fully, then put the polycrystalline powder into a mold, and press the fully ground powder into a diameter of 25mm under a pressure of 20MPa And the polycrystalline material wafer blank with 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 material wafer; then the polycrystalli...

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 Weigh and accurately mix according to the specified molar ratio, put the mixed powder in an agate mortar and grind it thoroughly for 8 hours and mix evenly. The first pre-calcination is kept at 800°C in the air for 12 hours, and it is naturally cooled down to room temperature with the furnace to prepare Ho Polycrystalline powder of element oxides, Mn oxides and iron oxides; then put it back in an agate mortar and grind it fully, then put the polycrystalline powder into a mold, and press the fully ground powder under a pressure of 20MPa Form a polycrystalline wafer blank with a diameter of 20 mm and a thickness of 4 mm, and then sinter the second time in a high-temperature furnace at a temper...

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Abstract

The invention discloses a growth method of a rare earth orthoferrite single crystal. The first crystal growth is carried out by an optical floating zone growth method to obtain a single crystal with one direction, and then the single crystal is used as a seed crystal rod for cyclic growth. A single crystal with 3 orientations is obtained. The invention also discloses the application of the growth method of the rare earth orthoferrite single crystal, which is used for preparing the rare earth orthoferrite single crystal material. The present invention combines the characteristics of the rare earth material itself, uses the optical floating zone method, and obtains a stable melt by controlling the process parameters such as the growth rate of the single crystal, the rotation speed of the material rod and the flow rate of the atmosphere, and adopts the single crystal as the lower rod to achieve cyclic growth. Rare earth orthoferrite with clear a,b,c crystallographic directions R FeO3 functional single crystal crystal, the whole preparation process, no corrosion, no pollution, good crystal integrity, high crystal quality, high crystal growth efficiency and good repeatability.

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

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B13/00C30B29/24C30B29/22
Inventor 王冠伟袁淑娟张金仓曹世勋
Owner SHANGHAI UNIV
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