Defect Structure and Properties of Sr-Doped La Cr O3-d

Mahmoud OMARI; İlhem CHADLI; Salah BELAIDI

Makale detayları

Defect Structure and Properties of Sr-Doped La Cr O3-d

Yazarlar:

Mahmoud OMARI | İlhem CHADLI | Salah BELAIDI

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Chemistry 2004 Vol.28 Issue 5, pp.535-546

Belge Tipi:

Makale

Yayın Tarihi:

4/2004

Belge Dili:

Türkçe

Document ID (Org No.):

2000729234

Sıklık:

İki Aylık

eISSN:

1303-6130

pISSN:

1300-0527

Özet:

 

A defect chemical model for the behavior of acceptor-doped  LaCrO3 as a function of oxygen pressure is proposed.  This is  considered within the regime that corresponds to oxygen deficit  oxygen.  The mathematical approach allows us to calculate the oxygen  partial pressure dependant properties of La1-x Srx Cr O3-d  in the range 0.10 \le x \le 0.30.  The results show that the  conductivity was independent of pO2 and was proportional to the  dopant concentration at high pO2.  Therefore, under reducing  conditions, the conductivity decreased exponentially with decreasing  pO2 and asymptotically approached a pO21/4 relationship.    Stability regimes and compensation mechanisms at various oxygen  partial pressures and temperatures are proposed.  This model also  examines the charge compensation mechanisms that dominate under the  different regimes and their implications for transport properties.   From equilibrium constants, thermodynamic quantities such as standard  enthalpy and entropy change for the defect formation reactions were  calculated.

 

A defect chemical model for the behavior of acceptor-doped  LaCrO3 as a function of oxygen pressure is proposed.  This is  considered within the regime that corresponds to oxygen deficit  oxygen.  The mathematical approach allows us to calculate the oxygen  partial pressure dependant properties of La1-x Srx Cr O3-d  in the range 0.10 \le x \le 0.30.  The results show that the  conductivity was independent of pO2 and was proportional to the  dopant concentration at high pO2.  Therefore, under reducing  conditions, the conductivity decreased exponentially with decreasing  pO2 and asymptotically approached a pO21/4 relationship.    Stability regimes and compensation mechanisms at various oxygen  partial pressures and temperatures are proposed.  This model also  examines the charge compensation mechanisms that dominate under the  different regimes and their implications for transport properties.   From equilibrium constants, thermodynamic quantities such as standard  enthalpy and entropy change for the defect formation reactions were  calculated.

Makale detayları

Defect Structure and Properties of Sr-Doped La Cr O3-d

Yazarlar: Mahmoud OMARI | İlhem CHADLI | Salah BELAIDI

Yayıncı: TUBITAK

Dergi: Turkish Journal of Chemistry 2004 Vol.28 Issue 5, pp.535-546

Belge Tipi: Makale

Yayın Tarihi: 4/2004

Belge Dili: Türkçe

Document ID (Org No.): 2000729234

Sıklık: İki Aylık

eISSN: 1303-6130

pISSN: 1300-0527

Sayı

Yazarlar:

Mahmoud OMARI | İlhem CHADLI | Salah BELAIDI

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Chemistry 2004 Vol.28 Issue 5, pp.535-546

Belge Tipi:

Makale

Yayın Tarihi:

4/2004

Belge Dili:

Türkçe

Document ID (Org No.):

2000729234

Sıklık:

İki Aylık

eISSN:

1303-6130

pISSN:

1300-0527