Effective masses of the insulator materials

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Discussion Overview

The discussion revolves around the effective masses of conduction band (mc) and valence band (mv) for the insulator material Al2O3. Participants explore definitions, calculations, and the nature of the material's structure, focusing on theoretical and conceptual aspects.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant inquires about the effective masses of Al2O3 and requests references.
  • Another participant questions the definition of effective mass and suggests looking for the band structure of Al2O3.
  • A participant explains that effective mass is derived from the E-K diagram, which is applicable to crystalline structures, and expresses uncertainty about the structural nature of Al2O3.
  • A later reply confirms that Al2O3 is a single-crystal form known as sapphire, which may influence the effective mass calculations.
  • One participant continues to seek specific values for mc and mv.

Areas of Agreement / Disagreement

Participants generally agree on the definition and calculation method for effective mass but express uncertainty regarding the specific effective masses of Al2O3 and its structural characteristics. No consensus on the values of mc and mv is reached.

Contextual Notes

The discussion highlights the dependence on the crystalline nature of Al2O3 for effective mass calculations and the need for specific band structure data, which remains unresolved.

islam.hashem
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What are the effective mass of conduction band (mc) and valence band (mv) of insulator material Al2O3. Kindly tell me your reference
 
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1. Do you know the definition of effective mass?

2. Can you find the band structure of Al2O3?

Zz.
 
i know that the effective mass is calculated from the E-K diagram (inversely proportional to the curvature) and E-K diagram is calculated for crystalline structure only not amorphous. I do not know whether Al2O3 was crystalline or amorphous. Thanks.
 
islam.hashem said:
i know that the effective mass is calculated from the E-K diagram (inversely proportional to the curvature) and E-K diagram is calculated for crystalline structure only not amorphous. I do not know whether Al2O3 was crystalline or amorphous. Thanks.

Look up "sapphire". That's a single-crystal Al2O3.

Zz.
 
Thanks for your reply. Do you know its effective masses mc and mv?. Thanks!
 

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