義守大學 97 學年度博士班入學招生考試

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義守大學 97 學年度博士班入學招生考試

^試題

學系別材料科學與工程學系博士班 ^考試日期 ^97/6/13

考試科目材料科學

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※此為試題卷。答案請另寫在答案卷內，未寫於答案卷內者，不予計分。

※本科不可使用計算機。

一、選擇題 (單選，1-8 題，每題 5 分，共 40 分)

(1) What would be the composition of a crystal made form a HCP stacking of A atoms with B atoms in ¼ of the tetrahedral sites and C atoms in half the octahedral sites ? (A) AB2C2, (B) A2BC, (C) ABC, (D) AB4C2。

(2) The NaCl structure can be seen as two interwined FCC lattices shifted by (A) (1/4,3/4,1/4) (B) (1/4,1/4,1/4), (C) (1/2,0,0), (d) (1/2,1/2,1/2)。

(3) Which of the following compounds have the highest ionic character (A) CaS, (B) MgI2; (C) CaBr2; (D) Na2S。

(4) Which of the three following glasses do you expect to have the highest refractive index?

(A) SiO2; (B) 5SiO2 - 95PbO2; (C) 33SiO2 - 37PbO2; (D) 95Al2O3-5SiO2。

(5) Which of following composition is based on the FCC crystal structure with filled all tetrahedral interstitial sites ? (A) ZnS

;

(B) NaCl

;

(C) NiAs

;

(D) unknown。

(6) How many tetrahedral interstitial sites for HCP structure ? (A) 12

;

(B) 6

;

(C) 4

;

(D) 8.

(7)

Which of the following solid do you expect to transmit light the furthest into the infrared? (A) As

2

S

3

; (B) B

2

O

3

; (C) CdS

2

; (D) CdTe

2。

(8)

What is the average number of valence electron per atom on the following compound:

CdAg

2

Ge

4

Ga

2

Se

4

P

2

, (A) 3; (B) ; 2; (C) 4; (D) 5

。

二、問答題 (1-3 題，每題 20 分，共 60 分)

(1) Please use energy band structure to distinguish and explain why the materials divided into three categories.

(2) Please use the diagram of bonding energy as a function of interatomic separation to explain what is the difference in thermal expansion of ceramic, metal and plastic?

(3) What is the recovery, recrystallization and grain growth during the heat treatment of metal? Please draw the microstructure of the sample as a function of annealing temperature corresponding to recovery, recrystallization and grain growth steps ?

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義守大學 97 學年度博士班入學招生考試