Original scientific paper

Magnetic and optical properties of ammonium acid phthalate

Mohamed Gaafar ; Physics Department, Faculty of Science, Alexandria University, Egypt

Abstract

Studies of the principal diamagnetic susceptibilities and refractive indices of ammonium acid phthalate (AAP) crystal of orthorhombic phase are reported. The two properties for the crystal axes a, b and c are of opposite order, i.e., χa > χb > χc, while na > nb > nc. Their relationsto the structure are offered. The crystalis magnetically unique and optically biaxial with a strong negative optical birefringence. The optical axial plane is parallel to the (010) plane and the molecular one is nearer to the (100) plane. The work gives information on the shape and orientation of the molecules within the unit cell.

Keywords

amonium acid phthalate; crystal; diamagnetic susceptibilities; birefringenc

Hrčak ID:

299939

URI

https://hrcak.srce.hr/299939

Publication date:

1.3.1998.

Article data in other languages: croatian

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