Luận án tiến sĩ Kỹ thuật vật liệu: Nghiên cứu sự hình thành kẽm pherit ZnFe2O4 từ các hỗn hợp bột (Fe2O3 – ZnO) và (Fe3O4 – Zn) dưới tác dụng của nghiền năng lượng cao

6,065
113
131
107
tính hoá hc cao nên d dàng kết hp với nhau để to pha mi. Vic hình thành pherit
spinen khi nghin Fe
3
O
4
và Zn xy ra sm và thun lợi hơn so với nghin -Fe
2
O
3
và
ZnO còn do nó có cu trúc lptm ging ca -Fe
2
O
3
nên tốn ít năng lượng hơn khi thiết
lp cu trúc mng tinh th.
Khi nghin Fe
3
O
4
và Zn trong môi trường khí bo v: Theo giản đồ Ellingham, trong
điều kin nghin này có th xy ra phn ng nhit kim: Fe
3
O
4
+ 4Zn = 3Fe + 4ZnO.
Các sn phm này (Fe + ZnO) không b thay đổi trong quá trình nghin tiếp theo.
II. Trên cơ sở các kết qu thu được v ảnh hưởng của thay đổi thi gian nghiền cũng như nguyên
liệu ban đầu đến s hình thành pherit spinen, chúng tôi đưa ra một s kiến ngh sau:
Trong quá trình nghin, ngoài vic làm nh ht, nh tinh th, to pha mi, tích lu biến
dạng, … còn có thể làm thay đổi phân b các ion vào các l hng 4 mt và 8 mặt. Do đó vấn
đề này cần được nghiên cứu sâu hơn và cần các phép đo có độ chính xác và tin cậy cao như:
ph Mossbauer, tán x nơtron, …
107 tính hoá học cao nên dễ dàng kết hợp với nhau để tạo pha mới. Việc hình thành pherit spinen khi nghiền Fe 3 O 4 và Zn xảy ra sớm và thuận lợi hơn so với nghiền -Fe 2 O 3 và ZnO còn do nó có cấu trúc lptm giống của -Fe 2 O 3 nên tốn ít năng lượng hơn khi thiết lập cấu trúc mạng tinh thể. • Khi nghiền Fe 3 O 4 và Zn trong môi trường khí bảo vệ: Theo giản đồ Ellingham, trong điều kiện nghiền này có thể xảy ra phản ứng nhiệt kim: Fe 3 O 4 + 4Zn = 3Fe + 4ZnO. Các sản phẩm này (Fe + ZnO) không bị thay đổi trong quá trình nghiền tiếp theo. II. Trên cơ sở các kết quả thu được về ảnh hưởng của thay đổi thời gian nghiền cũng như nguyên liệu ban đầu đến sự hình thành pherit spinen, chúng tôi đưa ra một số kiến nghị sau: Trong quá trình nghiền, ngoài việc làm nhỏ hạt, nhỏ tinh thể, tạo pha mới, tích luỹ biến dạng, … còn có thể làm thay đổi phân bố các ion vào các lỗ hổng 4 mặt và 8 mặt. Do đó vấn đề này cần được nghiên cứu sâu hơn và cần các phép đo có độ chính xác và tin cậy cao như: phổ Mossbauer, tán xạ nơtron, …
108
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DANH MC CÁC CÔNG TRÌNH CÔNG B CA LUN ÁN
1. HongThang Le, Thao Pham, QuocLap Tran, ThiHoangOanh Nguyen, HoangViet Nguyen,
QuocKhanh Dang (2014); Preparation of ZnFe2O4 by Self-sustaining Reactions Process
from Fe
3
O
4
and Zn; The 15
th
International Symposium on Eco-materials Processing and
Design (ISEPD2014) Vietnam.
2. Thang Le Hong, Lap Tran Quoc , Thao Pham, Viet Nguyen Hoang, Duc Nguyen Minh and
Oanh Nguyen Thi Hoang (2014); ZnO-Fe Nanocomposites Produced by Ball Milling and
Spark Plasma Sintering; The 13th Asian Foundry Congress (AFC-13).
3. Hng Thng, Phm Tho, Trn Quc Lp, Nguyn Hoàng Vit, Nguyn Th Hoàng
Oanh (2015); Tng hp ZnFe
2
O
4
bằng phương pháp nghiền năng lượng cao; Tp chí khoa
hc công ngh kim loi, 33-36.
4. Trn Quc Lp, Phm Tho, Hng Thng, Nguyn Hoàng Vit, Nguyn Th Hoàng
Oanh (2015); T tính ca vt liu ferit km chế to bằng phương pháp nghiền năng lượng
cao; Tp chí khoa hc công ngh kim loi, 45-48.
5. Le Hong Thang, Tran Quoc Lap, Pham Thao, Nguyen Hoang Viet, Dinh Van Cong, Do
Thanh Thuong, Nguyen Thi Hoang Oanh (2016); Mechanochemical Synthesis of FeZn
2
O
4
Powders from Zinc and Magnetite; Journal of Science and Technology, 085-088.
6. Hong Thang Le, Thao Pham, Quoc Lap Tran, Thi Hoang Oanh Nguyen, Hoang Viet
Nguyen and Minh Hai Le (2016); Structural investigation of the Nano Spinel Ferrites
Prepared by the Soft Mehanochemical Synthesis; ASEAN++2016 : Towards Geo-
resources Education in ASEAN Economic Community, Thai Lan.
7. Le Hong Thang, Pham Thao, Tran Quoc Lap, Nguyen Minh Duc, Nguyen Hoang Viet,
Nguyen Thi Hoang Oanh (2016); Rietveld Structure Refinement and Cation Distribution
of Nanocrystalline Zinc Ferrite ZnFe
2
0
4
; Hi ngh luyn kim và công ngh vt liu tiên
tiến - s phát trin bn vng ca nn công nghip, Vietnam.
117 DANH MỤC CÁC CÔNG TRÌNH CÔNG BỐ CỦA LUẬN ÁN 1. HongThang Le, Thao Pham, QuocLap Tran, ThiHoangOanh Nguyen, HoangViet Nguyen, QuocKhanh Dang (2014); Preparation of ZnFe2O4 by Self-sustaining Reactions Process from Fe 3 O 4 and Zn; The 15 th International Symposium on Eco-materials Processing and Design (ISEPD2014) Vietnam. 2. Thang Le Hong, Lap Tran Quoc , Thao Pham, Viet Nguyen Hoang, Duc Nguyen Minh and Oanh Nguyen Thi Hoang (2014); ZnO-Fe Nanocomposites Produced by Ball Milling and Spark Plasma Sintering; The 13th Asian Foundry Congress (AFC-13). 3. Lê Hồng Thắng, Phạm Thảo, Trần Quốc Lập, Nguyễn Hoàng Việt, Nguyễn Thị Hoàng Oanh (2015); Tổng hợp ZnFe 2 O 4 bằng phương pháp nghiền năng lượng cao; Tạp chí khoa học công nghệ kim loại, 33-36. 4. Trần Quốc Lập, Phạm Thảo, Lê Hồng Thắng, Nguyễn Hoàng Việt, Nguyễn Thị Hoàng Oanh (2015); Từ tính của vật liệu ferit kẽm chế tạo bằng phương pháp nghiền năng lượng cao; Tạp chí khoa học công nghệ kim loại, 45-48. 5. Le Hong Thang, Tran Quoc Lap, Pham Thao, Nguyen Hoang Viet, Dinh Van Cong, Do Thanh Thuong, Nguyen Thi Hoang Oanh (2016); Mechanochemical Synthesis of FeZn 2 O 4 Powders from Zinc and Magnetite; Journal of Science and Technology, 085-088. 6. Hong Thang Le, Thao Pham, Quoc Lap Tran, Thi Hoang Oanh Nguyen, Hoang Viet Nguyen and Minh Hai Le (2016); Structural investigation of the Nano Spinel Ferrites Prepared by the Soft Mehanochemical Synthesis; ASEAN++2016 : Towards Geo- resources Education in ASEAN Economic Community, Thai Lan. 7. Le Hong Thang, Pham Thao, Tran Quoc Lap, Nguyen Minh Duc, Nguyen Hoang Viet, Nguyen Thi Hoang Oanh (2016); Rietveld Structure Refinement and Cation Distribution of Nanocrystalline Zinc Ferrite ZnFe 2 0 4 ; Hội nghị luyện kim và công nghệ vật liệu tiên tiến - sự phát triển bền vững của nền công nghiệp, Vietnam.