{"id":9269,"date":"2021-07-31T11:49:51","date_gmt":"2021-07-31T04:49:51","guid":{"rendered":"http:\/\/trizgyrus.com\/blogtsk\/?p=9269"},"modified":"2021-07-31T11:52:27","modified_gmt":"2021-07-31T04:52:27","slug":"ap-suat-bien-doi-hop-chat-long-theo-nhung-cach-ky-la","status":"publish","type":"post","link":"https:\/\/cstc.vn\/blogtsk\/ap-suat-bien-doi-hop-chat-long-theo-nhung-cach-ky-la\/","title":{"rendered":"\u00c1p su\u1ea5t bi\u1ebfn \u0111\u1ed5i h\u1ee3p ch\u1ea5t ‘ l\u1ecfng’ theo nh\u1eefng c\u00e1ch k\u1ef3 l\u1ea1"},"content":{"rendered":"

C\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u b\u00e1o c\u00e1o r\u1eb1ng nh\u1eefng \u0111i\u1ec1u \u0111\u00e1ng ch\u00fa \u00fd \u0111\u00e3 x\u1ea3y ra khi m\u1ed9t h\u1ee3p ch\u1ea5t “l\u1ecfng” c\u1ee7a mangan v\u00e0 sulfua (MnS2) \u0111\u01b0\u1ee3c n\u00e9n trong m\u1ed9t chi\u1ebfc \u0111e kim c\u01b0\u01a1ng.<\/p>\n

Ashkan Salamat, ph\u00f3 gi\u00e1o s\u01b0 v\u1eadt l\u00fd t\u1ea1i \u0110\u1ea1i h\u1ecdc Nevada, Las Vegas, cho bi\u1ebft: \u201c\u0110\u00e2y l\u00e0 m\u1ed9t ki\u1ec3u c\u01a1 ch\u1ebf chuy\u1ec3n giao n\u0103ng l\u01b0\u1ee3ng m\u1edbi, v\u00e0 v\u00ec v\u1eady theo quan \u0111i\u1ec3m c\u1ee7a c\u1ed9ng \u0111\u1ed3ng khoa h\u1ecdc th\u00ec \u0111i\u1ec1u n\u00e0y r\u1ea5t, r\u1ea5t th\u00fa v\u1ecb\u201d.<\/p>\n

V\u00ed d\u1ee5, khi \u00e1p su\u1ea5t t\u0103ng l\u00ean, MnS2, m\u1ed9t ch\u1ea5t c\u00e1ch \u0111i\u1ec7n m\u1ec1m, chuy\u1ec3n sang tr\u1ea1ng th\u00e1i kim lo\u1ea1i v\u00e0 sau \u0111\u00f3 l\u1ea1i tr\u1edf th\u00e0nh ch\u1ea5t c\u00e1ch \u0111i\u1ec7n, c\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u m\u00f4 t\u1ea3 trong m\u1ed9t b\u00e0i b\u00e1o \u0111\u0103ng tr\u00ean t\u1ea1p ch\u00ed Physical Review Letters.<\/p>\n

“Th\u1ef1c t\u1ebf l\u00e0 v\u1eadt li\u1ec7u n\u00e0y \u0111i t\u1eeb ch\u1ea5t c\u00e1ch \u0111i\u1ec7n sang kim lo\u1ea1i v\u00e0 tr\u1edf l\u1ea1i ch\u1ea5t c\u00e1ch \u0111i\u1ec7n l\u00e0 r\u1ea5t hi\u1ebfm.”<\/p>\n

Ranga Dias, tr\u1ee3 l\u00fd gi\u00e1o s\u01b0 k\u1ef9 thu\u1eadt c\u01a1 kh\u00ed v\u00e0 v\u1eadt l\u00fd, v\u00e0 thi\u00ean v\u0103n h\u1ecdc t\u1ea1i \u0110\u1ea1i h\u1ecdc Rochester cho bi\u1ebft: \u201cKim lo\u1ea1i th\u01b0\u1eddng v\u1eabn l\u00e0 kim lo\u1ea1i, r\u1ea5t kh\u00f3 c\u00f3 kh\u1ea3 n\u0103ng ch\u00fang c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c thay \u0111\u1ed5i tr\u1edf l\u1ea1i th\u00e0nh ch\u1ea5t c\u00e1ch \u0111i\u1ec7n. Th\u1ef1c t\u1ebf l\u00e0 v\u1eadt li\u1ec7u n\u00e0y \u0111i t\u1eeb ch\u1ea5t c\u00e1ch \u0111i\u1ec7n sang kim lo\u1ea1i v\u00e0 tr\u1edf l\u1ea1i ch\u1ea5t c\u00e1ch \u0111i\u1ec7n l\u00e0 r\u1ea5t hi\u1ebfm.”<\/p>\n

H\u01a1n n\u1eefa, s\u1ef1 chuy\u1ec3n \u0111\u1ed5i \u0111i k\u00e8m v\u1edbi s\u1ef1 suy gi\u1ea3m ch\u01b0a t\u1eebng th\u1ea5y v\u1ec1 \u0111i\u1ec7n tr\u1edf v\u00e0 th\u1ec3 t\u00edch trong m\u1ed9t ph\u1ea1m vi thay \u0111\u1ed5i \u00e1p su\u1ea5t c\u1ef1c k\u1ef3 h\u1eb9p \u2014 t\u1ea5t c\u1ea3 \u0111\u1ec1u x\u1ea3y ra \u1edf kho\u1ea3ng 80 \u0111\u1ed9 F. Salamat cho bi\u1ebft, nhi\u1ec7t \u0111\u1ed9 t\u01b0\u01a1ng \u0111\u1ed1i th\u1ea5p l\u00e0m t\u0103ng kh\u1ea3 n\u0103ng qu\u00e1 tr\u00ecnh chuy\u1ec3n \u0111\u1ed5i kim lo\u1ea1i cu\u1ed1i c\u00f9ng c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c khai th\u00e1c cho c\u00f4ng ngh\u1ec7.<\/p>\n

Trong c\u00e1c b\u00e0i b\u00e1o tr\u01b0\u1edbc \u0111\u00e2y tr\u00ean t\u1ea1p ch\u00ed Nature and Physical Review Letters, Dias v\u00e0 Salamat \u0111\u00e3 \u0111\u1eb7t ra c\u00e1c ti\u00eau chu\u1ea9n m\u1edbi \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c \u0111\u1ed9 si\u00eau d\u1eabn \u1edf nhi\u1ec7t \u0111\u1ed9 ph\u00f2ng. M\u1ed9t m\u1eabu s\u1ed1 chung cho c\u00f4ng vi\u1ec7c c\u1ee7a h\u1ecd l\u00e0 kh\u00e1m ph\u00e1 c\u00e1c c\u00e1ch “\u0111\u1eb7c bi\u1ec7t k\u1ef3 l\u1ea1” m\u00e0 kim lo\u1ea1i chuy\u1ec3n ti\u1ebfp v\u00e0 c\u00e1c v\u1eadt li\u1ec7u kh\u00e1c ho\u1ea1t \u0111\u1ed9ng khi ch\u00fang \u0111\u01b0\u1ee3c gh\u00e9p n\u1ed1i v\u1edbi sulfua, v\u00e0 sau \u0111\u00f3 \u0111\u01b0\u1ee3c n\u00e9n trong m\u1ed9t c\u00e1i \u0111e kim c\u01b0\u01a1ng.<\/p>\n

\u201cC\u00e1c hi\u1ec7n t\u01b0\u1ee3ng m\u1edbi m\u00e0 ch\u00fang t\u00f4i \u0111ang b\u00e1o c\u00e1o l\u00e0 m\u1ed9t v\u00ed d\u1ee5 c\u01a1 b\u1ea3n v\u1ec1 ph\u1ea3n \u1ee9ng d\u01b0\u1edbi \u00e1p su\u1ea5t cao \u2014 v\u00e0 s\u1ebd t\u00ecm th\u1ea5y m\u1ed9t v\u1ecb tr\u00ed trong s\u00e1ch gi\u00e1o khoa v\u1eadt l\u00fd,\u201d Salamat n\u00f3i. \u201cC\u00f3 m\u1ed9t \u0111i\u1ec1u g\u00ec \u0111\u00f3 r\u1ea5t h\u1ea5p d\u1eabn v\u1ec1 c\u00e1ch l\u01b0u hu\u1ef3nh ho\u1ea1t \u0111\u1ed9ng khi n\u00f3 \u0111\u01b0\u1ee3c g\u1eafn v\u00e0o c\u00e1c nguy\u00ean t\u1ed1 kh\u00e1c. \u0110i\u1ec1u n\u00e0y \u0111\u00e3 d\u1eabn \u0111\u1ebfn m\u1ed9t s\u1ed1 \u0111\u1ed9t ph\u00e1 \u0111\u00e1ng ch\u00fa \u00fd \u201d.<\/p>\n

Nh\u1eefng \u0111\u1ed9t ph\u00e1 m\u00e0 ph\u00f2ng th\u00ed nghi\u1ec7m Dias v\u00e0 Salamat \u0111\u00e3 \u0111\u1ea1t \u0111\u01b0\u1ee3c li\u00ean quan \u0111\u1ebfn vi\u1ec7c n\u00e9n c\u00e1c picolit v\u1eadt li\u1ec7u \u0111\u01a1n thu\u1ea7n – c\u00f3 k\u00edch th\u01b0\u1edbc b\u1eb1ng m\u1ed9t h\u1ea1t m\u00e1y in phun duy nh\u1ea5t.<\/p>\n

Spin v\u00e0 \u00e1p l\u1ef1c<\/h2>\n

Dias v\u00e0 Salamat gi\u1ea3i th\u00edch r\u1eb1ng c\u01a1 b\u1ea3n c\u1ee7a c\u00e1c qu\u00e1 tr\u00ecnh chuy\u1ec3n \u0111\u1ed5i \u0111\u01b0\u1ee3c m\u00f4 t\u1ea3 trong b\u00e0i b\u00e1o n\u00e0y l\u00e0 c\u00e1ch c\u00e1c tr\u1ea1ng th\u00e1i spin (m\u00f4 men \u0111\u1ed9ng l\u01b0\u1ee3ng) c\u1ee7a c\u00e1c electron ri\u00eang l\u1ebb t\u01b0\u01a1ng t\u00e1c khi \u00e1p d\u1ee5ng \u00e1p l\u1ef1c.<\/p>\n

Khi MnS2 \u1edf tr\u1ea1ng th\u00e1i c\u00e1ch \u0111i\u1ec7n b\u00ecnh th\u01b0\u1eddng, c\u00e1c \u0111i\u1ec7n t\u1eed ch\u1ee7 y\u1ebfu \u1edf trong c\u00e1c obitan ch\u01b0a gh\u00e9p \u0111\u00f4i, “spin cao”, khi\u1ebfn c\u00e1c nguy\u00ean t\u1eed ch\u1ee7 \u0111\u1ed9ng b\u1eadt l\u1ea1i. \u0110i\u1ec1u n\u00e0y d\u1eabn \u0111\u1ebfn v\u1eadt li\u1ec7u c\u00f3 kh\u1ea3 n\u0103ng ch\u1ed1ng l\u1ea1i \u0111i\u1ec7n t\u00edch cao h\u01a1n v\u00ec c\u00f3 \u00edt kh\u00f4ng gian t\u1ef1 do h\u01a1n cho c\u00e1c electron ri\u00eang l\u1ebb c\u1ed1 g\u1eafng \u0111i qua v\u1eadt li\u1ec7u.<\/p>\n

Nh\u01b0ng khi c\u00f3 \u00e1p l\u1ef1c – v\u00e0 v\u1eadt li\u1ec7u b\u1ecb n\u00e9n v\u1ec1 tr\u1ea1ng th\u00e1i kim lo\u1ea1i – c\u00e1c obitan electron \u201cb\u1eaft \u0111\u1ea7u nh\u00ecn th\u1ea5y nhau, ngay l\u1eadp t\u1ee9c ti\u1ebfn v\u1ec1 ph\u00eda nhau, v\u00e0 c\u00e1c c\u1eb7p electron b\u1eaft \u0111\u1ea7u li\u00ean k\u1ebft l\u1ea1i th\u00e0nh m\u1ed9t\u201d, Salamat n\u00f3i.<\/p>\n

\u0110i\u1ec1u n\u00e0y m\u1edf ra nhi\u1ec1u kh\u00f4ng gian h\u01a1n cho c\u00e1c electron ri\u00eang l\u1ebb di chuy\u1ec3n qua v\u1eadt li\u1ec7u \u2014 \u0111\u1ebfn m\u1ee9c \u0111i\u1ec7n tr\u1edf gi\u1ea3m \u0111\u1ed9t ng\u1ed9t 8 b\u1eadc \u0111\u1ed9 l\u1edbn, khi \u00e1p su\u1ea5t t\u0103ng t\u1eeb 3 gigapascal (435.000 psi) l\u00ean 10 gigapascal.<\/p>\n

\u0110\u00e2y l\u00e0 m\u1ed9t “c\u00fa hu\u00fdch” t\u01b0\u01a1ng \u0111\u1ed1i so v\u1edbi 182 \u0111\u1ebfn 268 gigapascal c\u1ea7n thi\u1ebft cho v\u1eadt li\u1ec7u si\u00eau d\u1eabn. Dias n\u00f3i: \u201cV\u1edbi m\u1ed9t ph\u1ea1m vi \u00e1p su\u1ea5t nh\u1ecf, s\u1ef1 s\u1ee5t gi\u1ea3m l\u1ef1c c\u1ea3n \u1edf m\u1ee9c \u0111\u1ed9 n\u00e0y th\u1ef1c s\u1ef1 r\u1ea5t l\u1edbn.<\/p>\n

\u0110i\u1ec7n tr\u1edf th\u1ea5p v\u1eabn \u0111\u01b0\u1ee3c duy tr\u00ec ngay c\u1ea3 trong giai \u0111o\u1ea1n cu\u1ed1i – khi MnS2 tr\u1edf l\u1ea1i th\u00e0nh ch\u1ea5t c\u00e1ch \u0111i\u1ec7n – b\u1edfi v\u00ec c\u00e1c \u0111i\u1ec7n t\u1eed v\u1eabn \u1edf tr\u1ea1ng th\u00e1i “spin th\u1ea5p”.<\/p>\n

Khoa h\u1ecdc c\u01a1 b\u1ea3n, ti\u1ec1m n\u0103ng l\u1edbn<\/h2>\n

Nh\u01b0 th\u01b0\u1eddng x\u1ea3y ra v\u1edbi nh\u1eefng kh\u00e1m ph\u00e1 m\u1edbi trong khoa h\u1ecdc c\u01a1 b\u1ea3n, nh\u1eefng \u1ee9ng d\u1ee5ng kh\u1ea3 thi v\u1eabn ch\u01b0a \u0111\u01b0\u1ee3c kh\u00e1m ph\u00e1. Tuy nhi\u00ean, Salamat n\u00f3i, m\u1ed9t kim lo\u1ea1i chuy\u1ec3n ti\u1ebfp, v\u1edbi m\u1ed9t l\u01b0\u1ee3ng bi\u1ebfn d\u1ea1ng t\u01b0\u01a1ng \u0111\u1ed1i nh\u1ecf, c\u00f3 th\u1ec3 chuy\u1ec3n t\u1eeb tr\u1ea1ng th\u00e1i n\u00e0y sang tr\u1ea1ng th\u00e1i kh\u00e1c \u2014 \u1edf nhi\u1ec7t \u0111\u1ed9 ph\u00f2ng, kh\u00f4ng k\u00e9m \u2014 c\u00f3 kh\u1ea3 n\u0103ng h\u1eefu \u00edch.<\/p>\n

\u201cB\u1ea1n c\u00f3 th\u1ec3 t\u01b0\u1edfng t\u01b0\u1ee3ng c\u00f3 m\u1ed9t c\u00f4ng t\u1eafc logic ho\u1eb7c \u0111\u0129a c\u1ee9ng ghi, trong \u0111\u00f3 m\u1ed9t ho\u00e1n v\u1ecb r\u1ea5t nh\u1ecf trong bi\u1ebfn d\u1ea1ng ho\u1eb7c \u0111i\u1ec7n \u00e1p c\u00f3 th\u1ec3 l\u00e0m cho m\u1ed9t th\u1ee9 g\u00ec \u0111\u00f3 chuy\u1ec3n t\u1eeb tr\u1ea1ng th\u00e1i \u0111i\u1ec7n t\u1eed n\u00e0y sang tr\u1ea1ng th\u00e1i \u0111i\u1ec7n t\u1eed kh\u00e1c. C\u00e1c phi\u00ean b\u1ea3n m\u1edbi c\u1ee7a b\u1ed9 nh\u1edb flash, ho\u1eb7c b\u1ed9 nh\u1edb tr\u1ea1ng th\u00e1i r\u1eafn, c\u00f3 th\u1ec3 ho\u00e1n v\u1ecb v\u00e0 th\u1ef1c hi\u1ec7n m\u1ed9t c\u00e1ch ti\u1ebfp c\u1eadn m\u1edbi b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng c\u00e1c lo\u1ea1i v\u1eadt li\u1ec7u n\u00e0y, \u201dSalamat n\u00f3i.<\/p>\n

\u201cB\u1ea1n c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n c\u00e1c thao t\u00e1c kh\u00e1 t\u00edch c\u1ef1c \u0111\u1ec3 l\u00e1i nh\u1eefng v\u1eadt li\u1ec7u n\u00e0y \u1edf t\u1ed1c \u0111\u1ed9 300 kelvin, khi\u1ebfn ch\u00fang c\u00f3 kh\u1ea3 n\u0103ng h\u1eefu \u00edch cho c\u00f4ng ngh\u1ec7\u201d.<\/p>\n

C\u00e1c \u0111\u1ed3ng t\u00e1c gi\u1ea3 kh\u00e1c \u0111\u1ebfn t\u1eeb Ph\u00f2ng th\u00ed nghi\u1ec7m Qu\u1ed1c gia Argonne; \u0110\u1ea1i h\u1ecdc Bourgogne; \u0110\u1ea1i h\u1ecdc Nevada, Las Vegas; v\u00e0 \u0110\u1ea1i h\u1ecdc Rochester.<\/p>\n

Qu\u1ef9 Khoa h\u1ecdc Qu\u1ed1c gia v\u00e0 B\u1ed9 N\u0103ng l\u01b0\u1ee3ng \u0111\u00e3 h\u1ed7 tr\u1ee3 nghi\u00ean c\u1ee9u. Vi\u1ec7n Si\u00eau m\u00e1y t\u00ednh Qu\u1ed1c gia UNLV \u0111\u00e3 cung c\u1ea5p t\u00e0i nguy\u00ean t\u00ednh to\u00e1n v\u00e0 c\u00e1c ph\u1ea7n c\u1ee7a c\u00f4ng vi\u1ec7c \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n t\u1ea1i Ph\u00f2ng th\u00ed nghi\u1ec7m Qu\u1ed1c gia Argonne v\u00e0 \u0110\u1ea1i h\u1ecdc Bourgogne.<\/p>\n

Ngu\u1ed3n: Futurity<\/p>\n

Nh\u1eefng k\u1ef3 v\u1ecdng, \u01b0\u1edbc ao r\u00e8n luy\u1ec7n ph\u1ea9m ch\u1ea5t s\u00e1ng t\u1ea1o cho b\u1ea3n th\u00e2n l\u00e0 \u0111i\u1ec1u ch\u00ednh \u0111\u00e1ng. Nh\u01b0ng s\u00e1ng t\u1ea1o c\u00f3 ph\u01b0\u01a1ng ph\u00e1p th\u00ec c\u1ea7n ph\u1ea3i \u0111\u01b0\u1ee3c gi\u1ea3ng gi\u1ea3i \u0111\u00fang, \u0111\u01b0\u1ee3c th\u1ef1c h\u00e0nh v\u00e0 trau d\u1ed3i th\u01b0\u1eddng xuy\u00ean. B\u1ea1n h\u00e3y t\u00ecm cho m\u00ecnh m\u1ed9t n\u01a1i uy t\u00edn \u0111\u1ec3 h\u1ecdc t\u1eadp v\u00e0 b\u1eaft \u0111\u1ea7u h\u00e0nh tr\u00ecnh \u0111\u1ebfn v\u1edbi s\u00e1ng t\u1ea1o nh\u00e9.<\/p>\n

Hi\u1ec7n nay, ch\u1ec9 c\u00f3 duy nh\u1ea5t kh\u00f3a h\u1ecdc PH\u01af\u01a0NG PH\u00c1P LU\u1eacN S\u00c1NG T\u1ea0O v\u00e0 \u0110\u1ed4I M\u1edaI<\/a> t\u1ea1i Trung t\u00e2m S\u00e1ng t\u1ea1o Khoa h\u1ecdc\u2013k\u1ef9 thu\u1eadt (TSK) thu\u1ed9c tr\u01b0\u1eddng Khoa H\u1ecdc T\u1ef1 Nhi\u00ean c\u00f3 chia s\u1ebb v\u1ec1 40 nguy\u00ean t\u1eafc th\u1ee7 thu\u1eadt s\u00e1ng t\u1ea1o. \u0110\u00e2y l\u00e0 m\u00f4n h\u1ecdc b\u1ed5 \u00edch cho m\u1ecdi \u0111\u1ed1i t\u01b0\u1ee3ng, m\u1ecdi ng\u00e0nh ngh\u1ec1 c\u00f3 th\u1ec3 \u00e1p d\u1ee5ng v\u00e0 trau d\u1ed3i ph\u1ea9m ch\u1ea5t s\u00e1ng t\u1ea1o. N\u1ebfu b\u1ea1n quan t\u00e2m, vui l\u00f2ng \u0111i\u1ec1n th\u00f4ng tin t\u1ea1i \u0111\u00e2y<\/a> ho\u1eb7c li\u00ean h\u1ec7 s\u1ed1 \u0111i\u1ec7n tho\u1ea1i: (028) 38 301 743; 089 668 36 31 \u0111\u1ec3 th\u1ef1c hi\u1ec7n \u0111\u0103ng k\u00fd.<\/p>\n","protected":false},"excerpt":{"rendered":"

C\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u b\u00e1o c\u00e1o r\u1eb1ng nh\u1eefng \u0111i\u1ec1u \u0111\u00e1ng ch\u00fa \u00fd \u0111\u00e3 x\u1ea3y ra khi m\u1ed9t h\u1ee3p ch\u1ea5t “l\u1ecfng” c\u1ee7a mangan v\u00e0 sulfua (MnS2) \u0111\u01b0\u1ee3c n\u00e9n trong m\u1ed9t chi\u1ebfc \u0111e kim c\u01b0\u01a1ng. Ashkan Salamat, … <\/p>\n","protected":false},"author":1,"featured_media":9270,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[82],"tags":[],"yoast_head":"\n\u00c1p su\u1ea5t bi\u1ebfn \u0111\u1ed5i h\u1ee3p ch\u1ea5t ' l\u1ecfng' theo nh\u1eefng c\u00e1ch k\u1ef3 l\u1ea1 - Blog TSK<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/cstc.vn\/blogtsk\/ap-suat-bien-doi-hop-chat-long-theo-nhung-cach-ky-la\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u00c1p su\u1ea5t bi\u1ebfn \u0111\u1ed5i h\u1ee3p ch\u1ea5t ' l\u1ecfng' theo nh\u1eefng c\u00e1ch k\u1ef3 l\u1ea1 - Blog TSK\" \/>\n<meta property=\"og:description\" content=\"C\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u b\u00e1o c\u00e1o r\u1eb1ng nh\u1eefng \u0111i\u1ec1u \u0111\u00e1ng ch\u00fa \u00fd \u0111\u00e3 x\u1ea3y ra khi m\u1ed9t h\u1ee3p ch\u1ea5t “l\u1ecfng” c\u1ee7a mangan v\u00e0 sulfua (MnS2) \u0111\u01b0\u1ee3c n\u00e9n trong m\u1ed9t chi\u1ebfc \u0111e kim c\u01b0\u01a1ng. 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