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PbxPdO2 block material with room-temperature ferromagnetism, and preparation method thereof

A room temperature ferromagnetic, bulk material technology, applied in the field of PbxPdO2 bulk material and preparation, to achieve the effects of easy transportation and storage, low hazard, and simple process steps

Inactive Publication Date: 2013-06-05
HEFEI UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Fabrication of PbPdO containing room temperature ferromagnetism is not possible with existing technologies 2 Bulk material problem, the present invention provides a Pb containing room temperature ferromagnetism x PdO 2 Bulk material and preparation method

Method used

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  • PbxPdO2 block material with room-temperature ferromagnetism, and preparation method thereof
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  • PbxPdO2 block material with room-temperature ferromagnetism, and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0023] After passing the PbO powder, PdO powder and PVA powder through a 100 mesh sieve respectively, weigh the PbO powder, PdO powder and PVA powder according to the mass ratio of 1.82:1:0.04;

[0024] Mix and grind PbO powder and PdO powder until uniform, then add PVA powder and continue mixing and grinding until uniform;

[0025] A homogeneously mixed powder consisting of PbO powder, PdO powder, and PVA powder was put into a mold for preparing bulk materials, and then 100kg / cm 2 The pressure is kept under pressure for 15 minutes to obtain a block shaped blank;

[0026] Put the block blank into a heat treatment furnace and calcined in an oxygen atmosphere. The heating curve of the calcining is as follows: firstly, the temperature is raised to 150°C at a heating rate of 15°C / min, and then the temperature is raised to 150°C at a heating rate of 1°C / min. to 300°C and keep it warm for 1 hour, and finally raise the temperature to 680°C at a heating rate of 6°C / min and hold it fo...

Embodiment 2

[0029] After passing the PbO powder, PdO powder and PVA powder through a 100 mesh sieve respectively, weigh the PbO powder, PdO powder and PVA powder respectively according to the mass ratio of 1.78:1:0.04;

[0030] Mix and grind PbO powder and PdO powder until uniform, then add PVA powder and continue mixing and grinding until uniform;

[0031] A homogeneously mixed powder consisting of PbO powder, PdO powder, and PVA powder was put into a mold for preparing bulk materials, and then 100kg / cm 2 The pressure is kept under pressure for 15 minutes to obtain a block shaped blank;

[0032] Put the block blank into a heat treatment furnace and calcined in an oxygen atmosphere. The heating curve of the calcining is as follows: firstly, the temperature is raised to 150°C at a heating rate of 5°C / min, and then the temperature is raised to 150°C at a heating rate of 0.75°C / min. to 300°C and keep it warm for 1 hour, and finally raise the temperature to 700°C at a heating rate of 4°C / min...

Embodiment 3

[0035] After passing the PbO powder, PdO powder and PVA powder through a 100 mesh sieve respectively, weigh the PbO powder, PdO powder and PVA powder according to the mass ratio of 1.70:1:0.04;

[0036] Mix and grind PbO powder and PdO powder until uniform, then add PVA powder and continue mixing and grinding until uniform;

[0037] A homogeneously mixed powder consisting of PbO powder, PdO powder, and PVA powder was put into a mold for preparing bulk materials, and then 100kg / cm 2 The pressure is kept under pressure for 15 minutes to obtain a block shaped blank;

[0038] Put the block blank into the heat treatment furnace and calcined in the air atmosphere. The heating curve of the calcination is: firstly, the temperature is raised to 150°C at a heating rate of 1.5°C / min, and then the temperature is raised to 150°C at a heating rate of 0.5°C / min. to 300°C and keep it warm for 1 hour, and finally raise the temperature to 720°C at a heating rate of 2.85°C / min and keep it there...

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Abstract

Aiming at the technical difficulty of the inability of preparing a PbxPdO2 block material with room-temperature ferromagnetism, existed in the prior art, the invention provides a PbxPdO2 block material with room-temperature ferromagnetism and a preparation method thereof. The PbxPdO2 block material has a single-phase body-centered orthorhombic structure, and Pb ion vacancies exist in lattices. The PbxPdO2 block material preparation method provided by the invention is substantially characterized in that a raw material formula according to which a Pb content is lower than a positive distribution ratio is adopted, such that heat treatment time is prolonged. Therefore, Pb content insufficiency is caused in PbPdO2 material, and Pb ion vacancies are formed. According to the invention, room-temperature ferromagnetism can be formed in the non-doped PbxPdO2 block material, and the method is simple and feasible. Therefore, references can be provided for the development of high-temperature ferromagnetism zero forbidden band semiconductor.

Description

technical field [0001] The invention relates to the field of preparation of zero-bandgap semiconductor materials, in particular to Pb containing room temperature ferromagnetism x PdO 2 Bulk materials and methods of preparation. Background technique [0002] A zero-gap semiconductor is a special semiconductor material whose valence band top and conduction band bottom are in contact at the Fermi level, which leads to a series of superior characteristics, including: energy band structure, transport properties, etc. The response to external influences such as magnetic field, electric field, pressure, and temperature is extremely sensitive; there is no minimum excitation energy threshold for the migration of electrons from the valence band to the conduction band; the electron mobility is 2-4 orders of magnitude higher than that of traditional semiconductors. For a long time, research on zero-bandgap semiconductors has been focused on Hg-based IV-VI compounds such as HgCdTe, HgT...

Claims

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Application Information

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IPC IPC(8): C04B35/01C04B35/622
Inventor 苏海林吴玉程黄荣俊黄舜渔黄贤良金智渊
Owner HEFEI UNIV OF TECH
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