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稀土多元滲法制備稀土碳化鉬LnxMoyC及其導(dǎo)電性
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國家自然科學(xué)基金項目（20671026）


RE Co-permeation Preparation and Conductivity of RE Molybdenum Carbide LnxMoyC
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    摘要:

    為擴大碳化鉬在導(dǎo)電材料方面的應(yīng)用，研究稀土碳化鉬LnxMoyC的制備方法及其導(dǎo)電性。采用稀土多元滲法，以(NH4)3[CrMo6O24H6]·7H2O為前驅(qū)體制備LnxMoyC。用X射線衍射、電子探針X射線能譜、光電子能譜和四探針電極等手段對其結(jié)構(gòu)、元素含量、價態(tài)及電性能等進行測試。結(jié)果表明：生成的LnxMoyC是六方密堆結(jié)構(gòu)；滲入的微量稀土元素對其導(dǎo)電性產(chǎn)生了影響；La0.00593Nd0.00562Sm0.00502Gd0.00500Mo1.98C(簡寫為LNSGMC)的室溫電導(dǎo)率（4.692×102 S·cm-1）比用傳統(tǒng)方法得到的最高值（1.025×102 S·cm-1）高近4.6倍，且在289~490 K范圍內(nèi)其表現(xiàn)出金屬導(dǎo)電行為，在490~550 K范圍內(nèi)卻表現(xiàn)出顯著的半導(dǎo)體導(dǎo)電行為。

    Abstract:

    In order to extend the application of Mo2C as electric materials, the preparation of RE molybdenum carbide LnxMoyC by means of rare earth co-permeation with (NH4)3[CrMo6O24H6]·7H2O as the precursor and its conductivity were studied. XRD, EDS, XPS and four-probe poles were used to characterize the structure, element content, valences and conductivity of LnxMoyC. Results show that the structure of the prepared LnxMoyC is single hexagonal close-packed (hcp) and some rare earth elements such as Nd, Gd, La and Sm permeated into crystal phase of molybdenum carbide have influence on its conductivity. The conductivity of LNSGMC (La0.00593Nd0.00562Sm0.00502Gd0.00500Mo1.98C ) at room temperature is 4.692×102 S·cm-1, which is 4.6 times higher than the highest value (1.025×102 S·cm-1) by conventional methods. In the range of 289-490 K, it shows metallic conductivity while in 490-550 K range it shows obvious semiconductor conductivity.

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楊 雙,李 昕,王進福,吳麗平.稀土多元滲法制備稀土碳化鉬LnxMoyC及其導(dǎo)電性[J].稀有金屬材料與工程,2010,39(3):523~527.[Yang Shuang, Li Xin, Wang Jinfu, Wu Liping. RE Co-permeation Preparation and Conductivity of RE Molybdenum Carbide LnxMoyC[J]. Rare Metal Materials and Engineering,2010,39(3):523~527.]
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  • 收稿日期:2009-04-14
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