The precipitation behavior in Mg-6 wt%Zn-1 wt%Y alloy annealed at different temperatures of 200˚C and 400˚C has been characterized by high resolution transmission electron microscope. When the alloy is annealed at 200˚C for 6 hr, the plate- and the rod-shaped β2' phases are precipitated in the matrix. The orientation relationship of plate-shaped precipitates with the matrix exhibits a [11ar20]β2 || [10ar10]Mg, (0001)β2' || (0001)Mg. While the rod-shaped precipitates have two kinds of the orientation relationships with the matrix, i.e. [11ar20]β2'||[0001] Mg, (0001)β2'||(11ar20) Mg and [11ar20]β2'||[0001] Mg, (ar1106)β2'||(10ar10) Mg. With increasing annealing time at 200˚C the β1' phases are also precipitated in the matrix and the orientation relationship exhibits a [010]β1' || [0001]Mg, (603)β1' || (01ar10)Mg between the β1' precipitate and the matrix. The icosahedral phases are precipitated in the alloy annealed at 400˚C and exhibit a [I2]I || [0001]Mg relationship with the matrix.

고분해능 전자현미경과 컴퓨터 이미지 시뮬레이션이 La이 첨가되고 또한 첨가되지 않은 Pb(Mg/ sub 1/3/Nb23/)O3고용체의 미세구조를 연구하기 위해서 사용되었다. 불규칙격자 영역의 격자 이미지는 정방정 형태와 유사 육방정 형태를 각각 보였다. 규칙격자 영역에서 Mg과 Nb의 비화학양론적인 규칙격자 구조 현상이<111>방향에 따라 관찰되었다. 실험 격자 이미지와 컴퓨터 시뮬레이션 이미지의 비교로부터, 규칙격자 구조를 가지는 영역의 장거리 규칙도는 0.2-0.7의 값을 가지고 있었고, 또한 규칙격자는 (NH4)3FeF6결정구조를 가지고 있었다. 작은 값의 장거리 규칙도를 가지는 규칙격자를 가지는 영역에서, 변형률 파형이 관찰되지 않았다. 이것은 대부분 두 양이온이 그들의 위치에 있기 때문에, 원자 변위가 없었기 때문이다.

Partially sericitized tourmaline from a pegmatite, Black Hills, South Dakota, U.S.A., was investigated using high-resolution transmission electron microscopy (HRTEM). Muscovite occurs as the only alteration product of tourmaline, and it is developed extensively as narrow veinlets along the 110 and 100 cleavage directions of tourmaline, indicating that a cleavage-controlled alteration mechanism was dominant. Muscovite was characterized mainly as two-layer polytypes with minor stacking disorder, but tourmaline is almost free of structural defects. HRTEM images of tourmaline-muscovite interfaces revealed that the interfaces between two minerals are composed of well-defined 110 and 100 boundaries of tourmaline. The (001) of muscovite is in general parallel to the c-axis of tourmaline, but tourmaline and replacing muscovite do not show specific crystallographic orientation relationship; muscovite consists of numerous 100-1000a thick subparallel packets, and the angles between the (001) of muscovite and (110) of tourmaline is highly variable. Al/Si ratios of both minerals suggest that tourmaline to muscovite alteration by late magnetic fluids has been facilitated by their similar Al/Si ratio in the incipient alteration stage, in that the hydration reaction with preservation of Al and Si would require only addition of K+ and H2O. Aluminous minerals other than muscovite were not characterized as the alteration products of tourmaline, indicating that tourmaline reacted directly to muscovite; the tourmaline alteration apparently occurred by the presence of residual fluids in which K+ is available and silica was not undersaturated.