首页> 外文期刊>Crystal Research and Technology: Journal of Experimental and Industrial Crystallography >Effect of lattice defects in divalent lattices by incorporating trivalent ions in biominerals: An EPR study of Cr(III) in zinc(II) potassium phosphate hexahydrate
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Effect of lattice defects in divalent lattices by incorporating trivalent ions in biominerals: An EPR study of Cr(III) in zinc(II) potassium phosphate hexahydrate

机译:在生物矿物中掺入三价离子对二价晶格中晶格缺陷的影响:六水合磷酸锌锌中六价铬的EPR研究

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摘要

In order to understand the effect of charge compensating vacancies on the number, orientation and magnitude of D-tensors, single crystal EPR measurements have been carried out with Cr(III) in zinc(II) potassium phosphate hexahydrate at room temperature. During crystal rotations, a maximum of 6/7 resonance lines or a minimum of 2 is noticed. Crystal rotations done in the three orthogonal planes have yielded spin Hamiltonian parameters for one site with: g(xx)=1.969, g(yy)=1.995, g(zz)=2.107; D-xx=66.2 mT; D-yy=91.7 mT, and D-zz=-157.9 mT. The powder EPR spectrum indicates a very broad line at g = 8, without any extra resonances from 0 to 650 mT both at room temperature and 77 K. The reason may be that due to large zero field splitting, the resonance at g = 2 is shifted to g = 8 position and the other resonances are below 0 or above 650 mT. (C) 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. [References: 25]
机译:为了理解电荷补偿空位对D张量的数量,取向和大小的影响,在室温下用六水合磷酸锌锌(II)中的Cr(III)进行了单晶EPR测量。在晶体旋转期间,注意到最多有6/7条共振线或最少2条共振线。在三个正交平面中完成的晶体旋转产生了一个位点的自旋哈密顿参数,其g(xx)= 1.969,g(yy)= 1.995,g(zz)= 2.107; D-xx = 66.2 mT; D-yy = 91.7mT,D-zz = -157.9mT。粉末EPR谱表明在g = 8时有一条非常宽的线,在室温和77 K时从0到650 mT都没有任何额外的共振。其原因可能是由于大的零场分裂,在g = 2时的共振是移至g = 8位置,其他共振低于0或高于650 mT。 (C)2004 WILEY-VCH Verlag GmbH&Co. KGaA,Weinheim。 [参考:25]

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