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Studies of Zero-field Splitting and its Pressure and Stress Dependence for Ni

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Studies of Zero-field Splitting and its Pressure and Stress Dependence for Ni

2+

in La

2

Mg

3

(NO

3

)

12

· 24 H

2

O Crystal

Wen-Chen Zheng

a;b;c

, Shao-Yi Wu

a;b;c

, and Hui-Ning Dong

a

aDepartment of Material Science, Sichuan University, Chengdu 610064, P. R. China

bInternational Centre for Materials Physics, Chinese Academy of Sciences, Shenyang 110016, P. R. China

cKey Laboratory for Radiation Physics and Technology of the Ministry of Education, P. R. China (in Sichuan University)

Reprint requests to W.-C. Z; E-mail: zhengwenchen@netease.com Z. Naturforsch. 56 a, 855–858 (2001); received September 5, 2001

By using the high-order perturbation formulas, thegfactorsgkandg?, the zero-field splittings

Dand the pressure and uniaxial stress dependences of zero-field splitting are studied for Ni2+ions in both Mg2+sites of La2Mg3(NO3)1224 H2O crystal. It is found that the local trigonal distortion anglesiof the two Ni2+centers are only slightly different from the corresponding host ones, but the local angular compressibilities under pressure and stress for both Ni2+centers are quite different not only from the corresponding host ones, but also from each other.

Key words: La2Mg3(NO3)1224 H2O; Ni2+; EPR; Local Distortion; Local Compressibility;

Crystal Field Theory.

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