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
Publication date:
1.3.1998.
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