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 p

Method used

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

Examples

Experimental program
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Effect test

Example Embodiment

[0022] Example 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 they are uniform, then add PVA powder and continue to mix and grind until uniform;

[0025] Put the uniformly mixed powder consisting of PbO powder, PdO powder and PVA powder into the mold for preparing the bulk material, and then apply 100kg / cm to the mold 2 And hold the pressure for 15 minutes to obtain a block-shaped blank;

[0026] Put the block-shaped blank into a heat treatment furnace and calcine in an oxygen atmosphere. The temperature rise curve of calcination is as follows: first raise the temperature to 150°C at a heating rate of 15°C / min, and then raise the temperature at a heating rate of 1°C / min To 300°C and keep it for 1 hour, and finally raise the temperature to 680°C at a heating rate of 6°C / min and keep...

Example Embodiment

[0028] Example 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 according to the mass ratio of 1.78:1:0.04;

[0030] Mix and grind PbO powder and PdO powder until they are uniform, then add PVA powder and continue to mix and grind until uniform;

[0031] Put the uniformly mixed powder consisting of PbO powder, PdO powder and PVA powder into the mold for preparing the bulk material, and then apply 100kg / cm to the mold 2 And hold the pressure for 15 minutes to obtain a block-shaped blank;

[0032] Put the block-shaped blank into a heat treatment furnace and calcine in an oxygen atmosphere. The temperature rise curve of calcination is as follows: first increase the temperature to 150°C at a heating rate of 5°C / min, and then increase the temperature at a heating rate of 0.75°C / min To 300℃ and keep it for 1 hour, and finally raise the temperature to 700℃ and keep it for 24 hours at a h...

Example Embodiment

[0034] Example 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 they are uniform, then add PVA powder and continue to mix and grind until uniform;

[0037] Put the uniformly mixed powder consisting of PbO powder, PdO powder and PVA powder into the mold for preparing the bulk material, and then apply 100kg / cm to the mold 2 And hold the pressure for 15 minutes to obtain a block-shaped blank;

[0038] Put the block-shaped blank into a heat treatment furnace and calcine in an air atmosphere. The temperature rise curve of calcination is as follows: first increase the temperature to 150°C at a heating rate of 1.5°C / min, and then increase the temperature at a heating rate of 0.5°C / min To 300°C and keep it for 1 hour, and finally raise the temperature to 720°C at a heating rate of 2.85°C / m...

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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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