Magnetic, Electrical, and Thermochemical Properties of Nonstoichiometric Titanomagnetite

[219621 . wanamaker] pi将研究合成钛磁铁矿单晶的磁性和热化学性质，强调它们对远程阳离子有序的依赖。高温非化学计量对钛磁铁矿固溶体系列磁性行为的影响尚不清楚。虽然非化学计量学和SRO已被认为是对该矿物系统中获得的不同磁性结果的可能解释，但这一假设尚未得到明确的实验证实。在理解钛磁铁矿的晶体化学和磁性方面取得了进一步的进展，现在有可能采用结合热电测量、穆斯堡尔光谱和磁测量的综合方法，对一套钛磁铁矿单晶进行测量，范围从磁铁矿到乌氏体。＊＊＊

9219621 Wannamaker The PIs will study the magnetic and thermochemical properties of synthetic single crystals of titanomagnetites emphasizing their dependences upon long-range cation ordering. The effects of high- temperature nonstoichiometry on the magnetic behavior in the titanomagnetite solid solution series are poorly understood. Although nonstoichiometry and SRO have been suggested as possible explanations for the disparate magnetic results obtained in this mineral system, there has yet to be a definitive experimental confirmation of this hypothesis. Further progress in understanding the crystal chemistry and magnetism of titanomagnetites is now possible with an integrated approach combining thermoelectric measurements, Mossbauer spectroscopy, and magnetic measurements for a suite of titanomagnetite single crystals spanning the range from magnetite to ulvosponel. ***