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Hydrothermal synthesis of undoped and Mn-doped ZeGa_2O_4 powders and thin films

机译：水热合成非掺杂和Mn掺杂的ZeGa_2O_4粉末和薄膜

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摘要

Undoped and manganese-doped zinc gallate powders and thin films have been synthesized via the hydrothermal route from aqueous solutions at a pH between 9.5 and 12.5. The chemical composition and the crystal size of the synthesized powder have been studied as a function of pH, temperature, and the composition of the precursor solution, such as the type of hydroxide used and the zinc, gallium, and lithium content. Specimens have been analyzed by x-ray diffraction, scanning and transmission electron microscopy, energy-dispersive x-ray spectroscopy, thermogravimetry, and inductively coupled plasma atomic emission spectroscopy. It is shown that crystallite size and chemical composition strongly depend on the solubility of the gallium species within the solution, which appears to determine the number of ZnGa_2O_4 nuclei per unit volume. Crystals of a few micrometers in size can be synthesized from solutions where Ga is very soluble (e.g., pH >= 11), whereas when Ga is not very soluble, the synthesis product is nanocrystalline. Thermogravimetric studies indicate that a considerable amount of OH~- is incorporated at the oxygen sites (every 5th to 10th site). Hydrothermal growth of heteroepitaxial zinc gallate thin films has been carried out on (111) MgAl_2O_4 and (00.1) LiNbO_3 substrates. Heteroepitaxy is based on a coincident pattern of oxygen sites in the two structures; that is, (111)_(ZGO) || (111)_(MAO) and (111)_(ZGO) || (00.6)_(LNO) for the out-of plane orientation and (11-bar0)_(ZGO) || (11-bar0)(MAO) and (11-bar0)_(ZGO) || (11-bar0)_(LNO) for the in-plane orientation, respectively. The thin films cover the substrate completely and consist of oriented grains of up to several hundred nanometers in size. In general, the films are twinned with two variants (in separate grains) that are related by a 60 deg rotation around [111]. This twinning can only be suppressed at high pH and high temperature and only on the MgAl_2O_4 substrates.
机译：通过水热法从pH值在9.5到12.5之间的水溶液合成了未掺杂和锰掺杂的没食子酸锌粉末和薄膜。已经研究了合成粉末的化学组成和晶体尺寸与pH，温度和前体溶液组成的关系，例如所用氢氧化物的类型以及锌，镓和锂的含量。样品已通过X射线衍射，扫描和透射电子显微镜，能量分散X射线光谱，热重分析和电感耦合等离子体原子发射光谱进行了分析。结果表明，微晶的大小和化学组成在很大程度上取决于镓在溶液中的溶解度，这似乎决定了单位体积中ZnGa_2O_4核的数量。可以从其中Ga极易溶（例如pH> = 11）的溶液中合成几微米大小的晶体，而当Ga不太溶时，合成产物是纳米晶体。热重研究表明，在氧位点（每5至10位）掺入了大量的OH-。在（111）MgAl_2O_4和（00.1）LiNbO_3衬底上进行了异质外延没食子酸锌锌薄膜的水热生长。异质外延是基于两个结构中氧位的重合模式。即（111）_（ZGO）|| （111）_（MAO）和（111）_（ZGO）|| （00.6）_（LNO）表示平面外方向，（11-bar0）_（ZGO）|| （11-bar0）（MAO）和（11-bar0）_（ZGO）|| （11-bar0）_（LNO）分别表示平面内方向。薄膜完全覆盖了基材，并且由尺寸高达几百纳米的取向晶粒组成。通常，胶片会缠绕有两个变体（在单独的颗粒中），这两个变体通过围绕[111]旋转60度来关联。仅在高pH和高温下且仅在MgAl_2O_4基板上才能抑制这种孪生。

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  • 来源
    《Journal of Materials Research》 |2004年第3期|p.902-912|共11页
  • 作者

    Lars Loeffler; Fred F. Lange;

  • 作者单位

    Materials Department, University of California, Santa Barbara, California 93106;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
  • 关键词

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