YCu3 (OH) 6Cl3 new phase material and preparation method thereof

Abstract

The invention discloses a YCu3 (OH) 6Cl3 new-phase material and a preparation method thereof, and belongs to the technical field of high-pressure regulation and control. YCu3 (OH) 6Cl3 powder of a quasi-two-dimensional structure with a pure space group of P-3m1 is used as an initial raw material, a symmetric diamond anvil cell press is used for pressurizing, the diameter of a diamond anvil surface is 300 microns, a T301 stainless steel sheet is adopted as a sealing gasket, silicone oil is used as a pressure transmitting medium, a ruby fluorescence standard pressure technology is adopted for calibrating pressure, the pressure is pressurized to 8.9-11.3 GPa, and a new high-pressure phase with the space group of P-3 is obtained. After pressure relief, the sample still keeps the P-3 structure. According to the invention, a novel YCu3 (OH) 6Cl3 space group structure which can stably exist under normal pressure is obtained by utilizing a high-pressure method for the first time, and the research in the fields of anti-ferromagnetic resistance materials, quantum spinning liquid and the like is expected to be expanded, so that a foundation is laid for practical application of the novel YCu3 (OH) 6Cl3 space group structure.

Description

Technical Field

[0001] The present invention belongs to the field of high-voltage regulation technology, and particularly relates to a method for synthesizing YCu with a new space group P-3 structure by using high-voltage technology. 3 (OH) 6 Cl 3 Crystal material, obtains YCu with P-3 structure that can exist stably under normal pressure 3 (OH) 6 Cl 3 Materials and methods. Background Art

[0002] The geometrically frustrated kagome lattice composed of corner-sharing triangles is one of the frontier hotspots in the field of strong correlation physics and has been widely studied in recent years. As an important branch of kagome lattice materials, atacamite (Cu 2 (OH) 3 The family of materials of the atacamite family has established a broad and flexible experimental platform for searching and testing new quantum spin frustrated systems and quantum spin liquid materials. 4-x M x (OH) 6 Cl 2 , where M is a transition metal element, such as Zn, Mn, Mg, Co, Ni, etc. Among them, Cu 3 Zn(OH) 6 Cl 2 That is, herbertsmithite, an iron vanadium crystal, which has been proven to have a nearly perfect S=1 / 2 Heisenberg cage lattice and is the earliest quantum spin liquid material discovered and widely studied.

[0003] In the past few years, atacamite family derivatives ReCu with perfect kagome lattice have been successfully synthesized. 3 (OH) 6 Cl 3 , where Re represents a rare earth element, such as Y, Eu, Sm and Nd. The diamagnetic trivalent cations can replace the divalent Zn in the kagome layer. 2+ ions. It has been reported that in YCu 3 (OH) 6 Cl 3 A geometrically perfect kagome lattice is realized in the quantum spin liquid ground state. 3+ and Cu 2+The ionic radius and charge differences between them are large, and the compound may not have obvious defects of magnetic / non-magnetic site mixing and antisite disorder.

[0004] High pressure is a physical parameter of extreme conditions, along with low temperature, ultra-strong and ultra-fast lasers, and strong magnetic fields. The application fields of high pressure research include geology (material composition and existence form deep in the earth; interaction and evolution of the crust, mantle, and core; material structure of planets), condensed matter physics (physical properties under extreme conditions: phase transition, superconductivity, supercriticality), chemistry (synthesis of new materials), materials science (superhard materials and industrial applications), biology (origin of life, protein folding and denaturation), and aerospace.

[0005] Pressure-induced structural phase transitions and electronic phase transitions have attracted much attention in current high-pressure scientific research. External pressure can effectively change the crystal structure of a material and even obtain metastable phase materials when the pressure is "unloaded" to normal conditions, greatly expanding the research space of quantum spin frustrated materials.

[0006] The present invention obtains the P-3 structure YCu which can be stably existed under normal pressure for the first time by high pressure synthesis method. 3 (OH) 6 Cl 3 The material has not been reported before. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide a simple method for preparing a P-3 structured YCu 3 (OH) 6 Cl 3 Materials and high-pressure synthesis methods thereof can overcome the shortcomings of existing background technologies and lay the foundation for expanding the research space of quantum spin frustrated materials.

[0008] The specific technical solutions of the present invention are as follows:

[0009] The YCu 3 (OH) 6 Cl 3 The new phase material has a space group of P-3, which is different from the existing P-3m1 structure and can remain stable at room temperature and pressure.

[0010] A YCu 3 (OH) 6 Cl 3 Preparation method of new phase material, using pure YCu with space group P-3m1 3 (OH) 6 Cl 3Crystal powder was used as the initial raw material. A symmetrical diamond anvil press was used to apply a pressure of about 11.3 GPa to the sample at room temperature. A new P-3 phase was obtained under high pressure, and after the pressure was released, the new phase existed stably under normal conditions.

[0011] The high pressure described in the present invention adopts a diamond anvil press, the diameter of the diamond anvil surface is 300μm, the sealing gasket is made of T301 stainless steel sheet, silicone oil is used as the pressure transmission medium, and the ruby ​​fluorescence pressure calibration technology is used to calibrate the pressure. After the pressure is released, the required new phase material is obtained.

[0012] The beneficial effect of the present invention is that the present invention uses the high pressure synthesis method for the first time to obtain YCu with space group P-3 3 (OH) 6 Cl 3 The new phase of the material can also exist stably after pressure relief. It can be synthesized at room temperature, with short preparation time, simple process, stable properties, safety and high efficiency. It can also expand the research space of copper-based quantum spin frustrated materials and lay the foundation for its practical application. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 YCu in Example 1 3 (OH) 6 Cl 3 In situ high pressure XRD patterns of the samples.

[0014] Figure 2 It is the XRD pattern of the sample at the initial pressure of 0.3 GPa.

[0015] Figure 3 This is the XRD pattern of the sample at a pressure of 8.9 GPa.

[0016] Figure 4 This is the XRD pattern of the sample at a pressure of 11.3 GPa.

[0017] Figure 5 is the XRD pattern of the sample after decompression. DETAILED DESCRIPTION

[0018] Example 1

[0019] Pure YCu with space group P-3m1 3 (OH) 6 Cl 3 The sample powder was used as the initial raw material, and the experiment was carried out in a Mao-Bell symmetrical diamond anvil press. The diameter of the diamond anvil surface was 300 μm, and the sealing gasket was made of T301 stainless steel. Before the experiment, the gasket was pre-pressed and a hole (100 μm in diameter) was punched in its center. 3 (OH) 6 Cl3 The sample powder, pressure transmission medium (silicone oil) and standard pressure material (ruby ball) were placed in the sample cavity. At room temperature, the structural evolution of the sample under pressure was studied using in situ synchrotron XRD. When the pressure was increased to 8.9 GPa, two obvious diffraction peaks could be clearly seen in the range of 17-19°, which gradually became more obvious as the pressure increased, and the space group of the sample changed to P-3. When the pressure reached 11.3 GPa, the pressure was slowly released to the initial pressure, and the two obvious diffraction peaks in the XRD still existed, retaining the structure of the high-pressure phase.

[0020] Figure 1 The YCu in Example 1 is given 3 (OH) 6 Cl 3 In situ high pressure XRD patterns of the samples.

[0021] Figure 2 Given is the XRD pattern of the sample at an initial pressure of 0.3 GPa.

[0022] Figure 3 The XRD pattern of the sample at a pressure of 8.9 GPa is given.

[0023] Figure 4 Given is the XRD pattern of the sample at a pressure of 11.3 GPa.

[0024] Figure 5 The XRD patterns of the samples after decompression are shown.

Claims

1. A new phase material of YCu3(OH)6Cl3, characterized in that: Its space group is P-3, with a quasi-two-dimensional layered structure, and its stable existence range under high pressure is 8.9-11.3 GPa.

2. A method for preparing a new phase material of YCu3(OH)6Cl3, characterized in that: Pure YCu3(OH)6Cl3 powder with a space group of P-3m1 structure was used as the initial raw material and pressurized using a symmetrical diamond anvil press. The diamond anvil surface size was 300μm, the sealing gasket was made of T301 stainless steel sheet, silicone oil was used as the pressure transmission medium, and the pressure was calibrated using ruby ​​fluorescence pressure calibration technology. The sample was pressurized to 8.9-11.3GPa to obtain a new high-pressure phase with a space group of P-3. After unloading the pressure, the obtained powder material still maintained the P-3 structure of the high-pressure phase.

3. The method for preparing a YCu3(OH)6Cl3 new phase material according to claim 2, characterized in that: The device used is a Mao-Bell type symmetrical diamond anvil press, with silicone oil as the pressure transmission medium. The pressure is calibrated at room temperature using a ruby ​​fluorescence pressure calibration system.

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