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首页> 外文期刊>IEEE Transactions on Magnetics >Evolution of Magnetic Properties of ${hbox{CaO}}hbox{-}{hbox{P}}_{2}{hbox{O}}_{5}hbox{-}{hbox{Na}}_{2}{hbox{O}}hbox{-}{hbox{Fe}}_{2}{hbox{O}}_{3}hbox{-}{hbox{SiO}}_{2}$ Glass Upon Heat Treatment
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Evolution of Magnetic Properties of ${hbox{CaO}}hbox{-}{hbox{P}}_{2}{hbox{O}}_{5}hbox{-}{hbox{Na}}_{2}{hbox{O}}hbox{-}{hbox{Fe}}_{2}{hbox{O}}_{3}hbox{-}{hbox{SiO}}_{2}$ Glass Upon Heat Treatment

机译：$ {hbox {CaO}} hbox {-} {hbox {P}} _ {2} {hbox {O}} _ {5} hbox {-} {hbox {Na}} _ {{2} {hbox {O}} hbox {-} {hbox {Fe}} _ {2} {hbox {O}} _ {3} hbox {-} {hbox {SiO}} _ {2} $玻璃热处理后

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Magnetic hysteresis loss and the resulting local heating in implanted thermoseed (magnetic biocompatible material) can be used to selectively destroy cancerous tissue. We have prepared magnetic bioglass ceramics (MBC) by annealing $41{hbox{CaO}}cdot 44$ ${hbox{SiO}}_{2}cdot 4{hbox{P}}_{2}{hbox{O}}_{5}cdot 8{hbox{Fe}}_{2}{hbox{O}}_{3}cdot 3{hbox{Na}}_{2}{hbox{O}}$ glass at temperatures ($T_{A}$ ) ranging from 750 $^circ{hbox{C}}$ to 1150 $^circ{hbox{C}}$ for 1 h. X-ray diffraction patterns confirm the presence of bone mineral (hydroxyapatite and wollastonite) and magnetite ( ${hbox{Fe}}_{3}{hbox{O}}_{4}$) phases in nanocrystalline form in the MBCs. Average crystallite size ( $d_{av}$) of all the phases increased with increasing $T_{A}$ . Magnetization ($Mhbox{-}H$ ) curves of all MBCs were recorded up to 20 kOe at 300 K to understand the evolution of magnetism in the nonmagnetic glass upon heat treatment. Magnetic properties correlated with $d_{av(magnetite)}$ for samples annealed up to 1050 $^circ {hbox{C}}$ . Electron paramagnetic resonance study was carried out to understand the behavior of sample annealed at 1150 $^circ{hbox{C}}$ and th- evolution of magnetic properties in the MBCs. This study also reveals a methodology to control the magnetic properties of this MBC and its potential application in hyperthermia treatment of bone cancer.
机译：磁滞损失和植入的热种子（磁性生物相容性材料）中产生的局部加热可用于选择性破坏癌变组织。我们通过退火$ 41 {hbox {CaO}} cdot 44 $ $ {hbox {SiO}} _ {2} cdot 4 {hbox {P}} _ {2} {hbox {O}}来制备磁性生物玻璃陶瓷（MBC） _ {5} cdot 8 {hbox {Fe}} _ {2} {hbox {O}} _ {3} cdot 3 {hbox {Na}} _ {2} {hbox {O}} $玻璃在温度（$ T_ {A} $）从1小时的750 $ ^ circ {hbox {C}} $到1150 $ ^ circ {hbox {C}} $不等。 X射线衍射图证实了MBC中纳米晶形式的骨矿物（羟基磷灰石和硅灰石）和磁铁矿（$ {hbox {Fe}} _ {3} {hbox {O}} _ {4} $）相的存在。所有相的平均微晶尺寸（$ d_ {av} $）随$ T_ {A} $的增加而增加。在300 K时记录所有MBC的磁化（$ Mhbox {-} H $）曲线，以了解热处理后非磁性玻璃中磁性的演变。退火至1050 $ ^ circ {hbox {C}} $的样品的磁性能与$ d_ {av（磁铁矿）} $相关。进行了电子顺磁共振研究，以了解在1150℃退火的样品的行为以及MBC中磁性的演化。这项研究还揭示了一种控制该MBC磁性能的方法及其在骨癌热疗中的潜在应用。

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